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mpeg12.c
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上传用户：wstnjxml
上传日期：2014-04-03
资源大小：7248k
文件大小：112k
源码类别：
Windows CE
开发平台：
C/C++
- /* * MPEG1 codec / MPEG2 decoder * Copyright (c) 2000,2001 Fabrice Bellard. * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at> * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with this library; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */ /** * @file mpeg12.c * MPEG1/2 codec */ //#define DEBUG #include "avcodec.h" #include "dsputil.h" #include "mpegvideo.h" #include "mpeg12data.h" //#undef NDEBUG //#include <assert.h> /* Start codes. */ #define SEQ_END_CODE 0x000001b7 #define SEQ_START_CODE 0x000001b3 #define GOP_START_CODE 0x000001b8 #define PICTURE_START_CODE 0x00000100 #define SLICE_MIN_START_CODE 0x00000101 #define SLICE_MAX_START_CODE 0x000001af #define EXT_START_CODE 0x000001b5 #define USER_START_CODE 0x000001b2 #define DC_VLC_BITS 9 #define MV_VLC_BITS 9 #define MBINCR_VLC_BITS 9 #define MB_PAT_VLC_BITS 9 #define MB_PTYPE_VLC_BITS 6 #define MB_BTYPE_VLC_BITS 6 #define TEX_VLC_BITS 9 #ifdef CONFIG_ENCODERS static void mpeg1_encode_block(MpegEncContext *s, DCTELEM *block, int component); static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code); // RAL: f_code parameter added #endif //CONFIG_ENCODERS static inline int mpeg1_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n); static inline int mpeg1_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n); static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n); static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n); static inline int mpeg2_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n); static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n); static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n); static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred); static void exchange_uv(MpegEncContext *s); #ifdef HAVE_XVMC extern int XVMC_field_start(MpegEncContext *s, AVCodecContext *avctx); extern int XVMC_field_end(MpegEncContext *s); extern void XVMC_pack_pblocks(MpegEncContext *s,int cbp); extern void XVMC_init_block(MpegEncContext *s);//set s->block #endif const enum PixelFormat pixfmt_yuv_420[]= {PIX_FMT_YUV420P,-1}; const enum PixelFormat pixfmt_yuv_422[]= {PIX_FMT_YUV422P,-1}; const enum PixelFormat pixfmt_yuv_444[]= {PIX_FMT_YUV444P,-1}; const enum PixelFormat pixfmt_xvmc_mpg2_420[] = { PIX_FMT_XVMC_MPEG2_IDCT, PIX_FMT_XVMC_MPEG2_MC, -1}; #ifdef CONFIG_ENCODERS static uint8_t (*mv_penalty)[MAX_MV*2+1]= NULL; static uint8_t fcode_tab[MAX_MV*2+1]; static uint32_t uni_mpeg1_ac_vlc_bits[64*64*2]; static uint8_t uni_mpeg1_ac_vlc_len [64*64*2]; /* simple include everything table for dc, first byte is bits number next 3 are code*/ static uint32_t mpeg1_lum_dc_uni[512]; static uint32_t mpeg1_chr_dc_uni[512]; static uint8_t mpeg1_index_run[2][64]; static int8_t mpeg1_max_level[2][64]; #endif //CONFIG_ENCODERS static void init_2d_vlc_rl(RLTable *rl, int use_static) { int i; init_vlc(&rl->vlc, TEX_VLC_BITS, rl->n + 2, &rl->table_vlc[0][1], 4, 2, &rl->table_vlc[0][0], 4, 2, use_static); if(use_static) rl->rl_vlc[0]= av_mallocz_static(rl->vlc.table_size*sizeof(RL_VLC_ELEM)); else rl->rl_vlc[0]= av_malloc(rl->vlc.table_size*sizeof(RL_VLC_ELEM)); for(i=0; i<rl->vlc.table_size; i++){ int code= rl->vlc.table[i][0]; int len = rl->vlc.table[i][1]; int level, run; if(len==0){ // illegal code run= 65; level= MAX_LEVEL; }else if(len<0){ //more bits needed run= 0; level= code; }else{ if(code==rl->n){ //esc run= 65; level= 0; }else if(code==rl->n+1){ //eob run= 0; level= 127; }else{ run= rl->table_run [code] + 1; level= rl->table_level[code]; } } rl->rl_vlc[0][i].len= len; rl->rl_vlc[0][i].level= level; rl->rl_vlc[0][i].run= run; } } #ifdef CONFIG_ENCODERS static void init_uni_ac_vlc(RLTable *rl, uint32_t *uni_ac_vlc_bits, uint8_t *uni_ac_vlc_len){ int i; for(i=0; i<128; i++){ int level= i-64; int run; for(run=0; run<64; run++){ int len, bits, code; int alevel= ABS(level); int sign= (level>>31)&1; if (alevel > rl->max_level[0][run]) code= 111; /*rl->n*/ else code= rl->index_run[0][run] + alevel - 1; if (code < 111 /* rl->n */) { /* store the vlc & sign at once */ len= mpeg1_vlc[code][1]+1; bits= (mpeg1_vlc[code][0]<<1) + sign; } else { len= mpeg1_vlc[111/*rl->n*/][1]+6; bits= mpeg1_vlc[111/*rl->n*/][0]<<6; bits|= run; if (alevel < 128) { bits<<=8; len+=8; bits|= level & 0xff; } else { bits<<=16; len+=16; bits|= level & 0xff; if (level < 0) { bits|= 0x8001 + level + 255; } else { bits|= level & 0xffff; } } } uni_ac_vlc_bits[UNI_AC_ENC_INDEX(run, i)]= bits; uni_ac_vlc_len [UNI_AC_ENC_INDEX(run, i)]= len; } } } static int find_frame_rate_index(MpegEncContext *s){ int i; int64_t dmin= INT64_MAX; int64_t d; for(i=1;i<14;i++) { int64_t n0= 1001LL/frame_rate_tab[i].den*frame_rate_tab[i].num*s->avctx->time_base.num; int64_t n1= 1001LL*s->avctx->time_base.den; if(s->avctx->strict_std_compliance > FF_COMPLIANCE_INOFFICIAL && i>=9) break; d = ABS(n0 - n1); if(d < dmin){ dmin=d; s->frame_rate_index= i; } } if(dmin) return -1; else return 0; } static int encode_init(AVCodecContext *avctx) { MpegEncContext *s = avctx->priv_data; if(MPV_encode_init(avctx) < 0) return -1; if(find_frame_rate_index(s) < 0){ if(s->strict_std_compliance > FF_COMPLIANCE_EXPERIMENTAL){ av_log(avctx, AV_LOG_ERROR, "MPEG1/2 does not support %d/%d fpsn", avctx->time_base.den, avctx->time_base.num); return -1; }else{ av_log(avctx, AV_LOG_INFO, "MPEG1/2 does not support %d/%d fps, there may be AV sync issuesn", avctx->time_base.den, avctx->time_base.num); } } return 0; } static void put_header(MpegEncContext *s, int header) { align_put_bits(&s->pb); put_bits(&s->pb, 16, header>>16); put_bits(&s->pb, 16, header&0xFFFF); } /* put sequence header if needed */ static void mpeg1_encode_sequence_header(MpegEncContext *s) { unsigned int vbv_buffer_size; unsigned int fps, v; int i; uint64_t time_code; float best_aspect_error= 1E10; float aspect_ratio= av_q2d(s->avctx->sample_aspect_ratio); int constraint_parameter_flag; if(aspect_ratio==0.0) aspect_ratio= 1.0; //pixel aspect 1:1 (VGA) if (s->current_picture.key_frame) { AVRational framerate= frame_rate_tab[s->frame_rate_index]; /* mpeg1 header repeated every gop */ put_header(s, SEQ_START_CODE); put_bits(&s->pb, 12, s->width); put_bits(&s->pb, 12, s->height); for(i=1; i<15; i++){ float error= aspect_ratio; if(s->codec_id == CODEC_ID_MPEG1VIDEO || i <=1) error-= 1.0/mpeg1_aspect[i]; else error-= av_q2d(mpeg2_aspect[i])*s->height/s->width; error= ABS(error); if(error < best_aspect_error){ best_aspect_error= error; s->aspect_ratio_info= i; } } put_bits(&s->pb, 4, s->aspect_ratio_info); put_bits(&s->pb, 4, s->frame_rate_index); if(s->avctx->rc_max_rate){ v = (s->avctx->rc_max_rate + 399) / 400; if (v > 0x3ffff && s->codec_id == CODEC_ID_MPEG1VIDEO) v = 0x3ffff; }else{ v= 0x3FFFF; } if(s->avctx->rc_buffer_size) vbv_buffer_size = s->avctx->rc_buffer_size; else /* VBV calculation: Scaled so that a VCD has the proper VBV size of 40 kilobytes */ vbv_buffer_size = (( 20 * s->bit_rate) / (1151929 / 2)) * 8 * 1024; vbv_buffer_size= (vbv_buffer_size + 16383) / 16384; put_bits(&s->pb, 18, v & 0x3FFFF); put_bits(&s->pb, 1, 1); /* marker */ put_bits(&s->pb, 10, vbv_buffer_size & 0x3FF); constraint_parameter_flag= s->width <= 768 && s->height <= 576 && s->mb_width * s->mb_height <= 396 && s->mb_width * s->mb_height * framerate.num <= framerate.den*396*25 && framerate.num <= framerate.den*30 && s->avctx->me_range && s->avctx->me_range < 128 && vbv_buffer_size <= 20 && v <= 1856000/400 && s->codec_id == CODEC_ID_MPEG1VIDEO; put_bits(&s->pb, 1, constraint_parameter_flag); ff_write_quant_matrix(&s->pb, s->avctx->intra_matrix); ff_write_quant_matrix(&s->pb, s->avctx->inter_matrix); if(s->codec_id == CODEC_ID_MPEG2VIDEO){ put_header(s, EXT_START_CODE); put_bits(&s->pb, 4, 1); //seq ext put_bits(&s->pb, 1, 0); //esc if(s->avctx->profile == FF_PROFILE_UNKNOWN){ put_bits(&s->pb, 3, 4); //profile }else{ put_bits(&s->pb, 3, s->avctx->profile); //profile } if(s->avctx->level == FF_LEVEL_UNKNOWN){ put_bits(&s->pb, 4, 8); //level }else{ put_bits(&s->pb, 4, s->avctx->level); //level } put_bits(&s->pb, 1, s->progressive_sequence); put_bits(&s->pb, 2, 1); //chroma format 4:2:0 put_bits(&s->pb, 2, 0); //horizontal size ext put_bits(&s->pb, 2, 0); //vertical size ext put_bits(&s->pb, 12, v>>18); //bitrate ext put_bits(&s->pb, 1, 1); //marker put_bits(&s->pb, 8, vbv_buffer_size >>10); //vbv buffer ext put_bits(&s->pb, 1, s->low_delay); put_bits(&s->pb, 2, 0); // frame_rate_ext_n put_bits(&s->pb, 5, 0); // frame_rate_ext_d } put_header(s, GOP_START_CODE); put_bits(&s->pb, 1, 0); /* do drop frame */ /* time code : we must convert from the real frame rate to a fake mpeg frame rate in case of low frame rate */ fps = (framerate.num + framerate.den/2)/ framerate.den; time_code = s->current_picture_ptr->coded_picture_number; s->gop_picture_number = time_code; put_bits(&s->pb, 5, (uint32_t)((time_code / (fps * 3600)) % 24)); put_bits(&s->pb, 6, (uint32_t)((time_code / (fps * 60)) % 60)); put_bits(&s->pb, 1, 1); put_bits(&s->pb, 6, (uint32_t)((time_code / fps) % 60)); put_bits(&s->pb, 6, (uint32_t)((time_code % fps))); put_bits(&s->pb, 1, !!(s->flags & CODEC_FLAG_CLOSED_GOP)); put_bits(&s->pb, 1, 0); /* broken link */ } } static inline void encode_mb_skip_run(MpegEncContext *s, int run){ while (run >= 33) { put_bits(&s->pb, 11, 0x008); run -= 33; } put_bits(&s->pb, mbAddrIncrTable[run][1], mbAddrIncrTable[run][0]); } #endif //CONFIG_ENCODERS static void common_init(MpegEncContext *s) { s->y_dc_scale_table= s->c_dc_scale_table= mpeg2_dc_scale_table[s->intra_dc_precision]; } void ff_mpeg1_clean_buffers(MpegEncContext *s){ s->last_dc[0] = 1 << (7 + s->intra_dc_precision); s->last_dc[1] = s->last_dc[0]; s->last_dc[2] = s->last_dc[0]; memset(s->last_mv, 0, sizeof(s->last_mv)); } #ifdef CONFIG_ENCODERS void ff_mpeg1_encode_slice_header(MpegEncContext *s){ put_header(s, SLICE_MIN_START_CODE + s->mb_y); put_bits(&s->pb, 5, s->qscale); /* quantizer scale */ put_bits(&s->pb, 1, 0); /* slice extra information */ } void mpeg1_encode_picture_header(MpegEncContext *s, int picture_number) { mpeg1_encode_sequence_header(s); /* mpeg1 picture header */ put_header(s, PICTURE_START_CODE); /* temporal reference */ // RAL: s->picture_number instead of s->fake_picture_number put_bits(&s->pb, 10, (s->picture_number - s->gop_picture_number) & 0x3ff); put_bits(&s->pb, 3, s->pict_type); s->vbv_delay_ptr= s->pb.buf + put_bits_count(&s->pb)/8; put_bits(&s->pb, 16, 0xFFFF); /* vbv_delay */ // RAL: Forward f_code also needed for B frames if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) { put_bits(&s->pb, 1, 0); /* half pel coordinates */ if(s->codec_id == CODEC_ID_MPEG1VIDEO) put_bits(&s->pb, 3, s->f_code); /* forward_f_code */ else put_bits(&s->pb, 3, 7); /* forward_f_code */ } // RAL: Backward f_code necessary for B frames if (s->pict_type == B_TYPE) { put_bits(&s->pb, 1, 0); /* half pel coordinates */ if(s->codec_id == CODEC_ID_MPEG1VIDEO) put_bits(&s->pb, 3, s->b_code); /* backward_f_code */ else put_bits(&s->pb, 3, 7); /* backward_f_code */ } put_bits(&s->pb, 1, 0); /* extra bit picture */ s->frame_pred_frame_dct = 1; if(s->codec_id == CODEC_ID_MPEG2VIDEO){ put_header(s, EXT_START_CODE); put_bits(&s->pb, 4, 8); //pic ext if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) { put_bits(&s->pb, 4, s->f_code); put_bits(&s->pb, 4, s->f_code); }else{ put_bits(&s->pb, 8, 255); } if (s->pict_type == B_TYPE) { put_bits(&s->pb, 4, s->b_code); put_bits(&s->pb, 4, s->b_code); }else{ put_bits(&s->pb, 8, 255); } put_bits(&s->pb, 2, s->intra_dc_precision); assert(s->picture_structure == PICT_FRAME); put_bits(&s->pb, 2, s->picture_structure); if (s->progressive_sequence) { put_bits(&s->pb, 1, 0); /* no repeat */ } else { put_bits(&s->pb, 1, s->current_picture_ptr->top_field_first); } /* XXX: optimize the generation of this flag with entropy measures */ s->frame_pred_frame_dct = s->progressive_sequence; put_bits(&s->pb, 1, s->frame_pred_frame_dct); put_bits(&s->pb, 1, s->concealment_motion_vectors); put_bits(&s->pb, 1, s->q_scale_type); put_bits(&s->pb, 1, s->intra_vlc_format); put_bits(&s->pb, 1, s->alternate_scan); put_bits(&s->pb, 1, s->repeat_first_field); s->progressive_frame = s->progressive_sequence; put_bits(&s->pb, 1, s->chroma_420_type=s->progressive_frame); put_bits(&s->pb, 1, s->progressive_frame); put_bits(&s->pb, 1, 0); //composite_display_flag } if(s->flags & CODEC_FLAG_SVCD_SCAN_OFFSET){ int i; put_header(s, USER_START_CODE); for(i=0; i<sizeof(svcd_scan_offset_placeholder); i++){ put_bits(&s->pb, 8, svcd_scan_offset_placeholder[i]); } } s->mb_y=0; ff_mpeg1_encode_slice_header(s); } static inline void put_mb_modes(MpegEncContext *s, int n, int bits, int has_mv, int field_motion) { put_bits(&s->pb, n, bits); if (!s->frame_pred_frame_dct) { if (has_mv) put_bits(&s->pb, 2, 2 - field_motion); /* motion_type: frame/field */ put_bits(&s->pb, 1, s->interlaced_dct); } } void mpeg1_encode_mb(MpegEncContext *s, DCTELEM block[6][64], int motion_x, int motion_y) { int i, cbp; const int mb_x = s->mb_x; const int mb_y = s->mb_y; const int first_mb= mb_x == s->resync_mb_x && mb_y == s->resync_mb_y; /* compute cbp */ cbp = 0; for(i=0;i<6;i++) { if (s->block_last_index[i] >= 0) cbp |= 1 << (5 - i); } if (cbp == 0 && !first_mb && s->mv_type == MV_TYPE_16X16 && (mb_x != s->mb_width - 1 || (mb_y != s->mb_height - 1 && s->codec_id == CODEC_ID_MPEG1VIDEO)) && ((s->pict_type == P_TYPE && (motion_x | motion_y) == 0) || (s->pict_type == B_TYPE && s->mv_dir == s->last_mv_dir && (((s->mv_dir & MV_DIR_FORWARD) ? ((s->mv[0][0][0] - s->last_mv[0][0][0])|(s->mv[0][0][1] - s->last_mv[0][0][1])) : 0) | ((s->mv_dir & MV_DIR_BACKWARD) ? ((s->mv[1][0][0] - s->last_mv[1][0][0])|(s->mv[1][0][1] - s->last_mv[1][0][1])) : 0)) == 0))) { s->mb_skip_run++; s->qscale -= s->dquant; s->skip_count++; s->misc_bits++; s->last_bits++; if(s->pict_type == P_TYPE){ s->last_mv[0][1][0]= s->last_mv[0][0][0]= s->last_mv[0][1][1]= s->last_mv[0][0][1]= 0; } } else { if(first_mb){ assert(s->mb_skip_run == 0); encode_mb_skip_run(s, s->mb_x); }else{ encode_mb_skip_run(s, s->mb_skip_run); } if (s->pict_type == I_TYPE) { if(s->dquant && cbp){ put_mb_modes(s, 2, 1, 0, 0); /* macroblock_type : macroblock_quant = 1 */ put_bits(&s->pb, 5, s->qscale); }else{ put_mb_modes(s, 1, 1, 0, 0); /* macroblock_type : macroblock_quant = 0 */ s->qscale -= s->dquant; } s->misc_bits+= get_bits_diff(s); s->i_count++; } else if (s->mb_intra) { if(s->dquant && cbp){ put_mb_modes(s, 6, 0x01, 0, 0); put_bits(&s->pb, 5, s->qscale); }else{ put_mb_modes(s, 5, 0x03, 0, 0); s->qscale -= s->dquant; } s->misc_bits+= get_bits_diff(s); s->i_count++; memset(s->last_mv, 0, sizeof(s->last_mv)); } else if (s->pict_type == P_TYPE) { if(s->mv_type == MV_TYPE_16X16){ if (cbp != 0) { if ((motion_x|motion_y) == 0) { if(s->dquant){ put_mb_modes(s, 5, 1, 0, 0); /* macroblock_pattern & quant */ put_bits(&s->pb, 5, s->qscale); }else{ put_mb_modes(s, 2, 1, 0, 0); /* macroblock_pattern only */ } s->misc_bits+= get_bits_diff(s); } else { if(s->dquant){ put_mb_modes(s, 5, 2, 1, 0); /* motion + cbp */ put_bits(&s->pb, 5, s->qscale); }else{ put_mb_modes(s, 1, 1, 1, 0); /* motion + cbp */ } s->misc_bits+= get_bits_diff(s); mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code); // RAL: f_code parameter added mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code); // RAL: f_code parameter added s->mv_bits+= get_bits_diff(s); } } else { put_bits(&s->pb, 3, 1); /* motion only */ if (!s->frame_pred_frame_dct) put_bits(&s->pb, 2, 2); /* motion_type: frame */ s->misc_bits+= get_bits_diff(s); mpeg1_encode_motion(s, motion_x - s->last_mv[0][0][0], s->f_code); // RAL: f_code parameter added mpeg1_encode_motion(s, motion_y - s->last_mv[0][0][1], s->f_code); // RAL: f_code parameter added s->qscale -= s->dquant; s->mv_bits+= get_bits_diff(s); } s->last_mv[0][1][0]= s->last_mv[0][0][0]= motion_x; s->last_mv[0][1][1]= s->last_mv[0][0][1]= motion_y; }else{ assert(!s->frame_pred_frame_dct && s->mv_type == MV_TYPE_FIELD); if (cbp) { if(s->dquant){ put_mb_modes(s, 5, 2, 1, 1); /* motion + cbp */ put_bits(&s->pb, 5, s->qscale); }else{ put_mb_modes(s, 1, 1, 1, 1); /* motion + cbp */ } } else { put_bits(&s->pb, 3, 1); /* motion only */ put_bits(&s->pb, 2, 1); /* motion_type: field */ s->qscale -= s->dquant; } s->misc_bits+= get_bits_diff(s); for(i=0; i<2; i++){ put_bits(&s->pb, 1, s->field_select[0][i]); mpeg1_encode_motion(s, s->mv[0][i][0] - s->last_mv[0][i][0] , s->f_code); mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code); s->last_mv[0][i][0]= s->mv[0][i][0]; s->last_mv[0][i][1]= 2*s->mv[0][i][1]; } s->mv_bits+= get_bits_diff(s); } if(cbp) put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]); s->f_count++; } else{ static const int mb_type_len[4]={0,3,4,2}; //bak,for,bi if(s->mv_type == MV_TYPE_16X16){ if (cbp){ // With coded bloc pattern if (s->dquant) { if(s->mv_dir == MV_DIR_FORWARD) put_mb_modes(s, 6, 3, 1, 0); else put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 0); put_bits(&s->pb, 5, s->qscale); } else { put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 0); } }else{ // No coded bloc pattern put_bits(&s->pb, mb_type_len[s->mv_dir], 2); if (!s->frame_pred_frame_dct) put_bits(&s->pb, 2, 2); /* motion_type: frame */ s->qscale -= s->dquant; } s->misc_bits += get_bits_diff(s); if (s->mv_dir&MV_DIR_FORWARD){ mpeg1_encode_motion(s, s->mv[0][0][0] - s->last_mv[0][0][0], s->f_code); mpeg1_encode_motion(s, s->mv[0][0][1] - s->last_mv[0][0][1], s->f_code); s->last_mv[0][0][0]=s->last_mv[0][1][0]= s->mv[0][0][0]; s->last_mv[0][0][1]=s->last_mv[0][1][1]= s->mv[0][0][1]; s->f_count++; } if (s->mv_dir&MV_DIR_BACKWARD){ mpeg1_encode_motion(s, s->mv[1][0][0] - s->last_mv[1][0][0], s->b_code); mpeg1_encode_motion(s, s->mv[1][0][1] - s->last_mv[1][0][1], s->b_code); s->last_mv[1][0][0]=s->last_mv[1][1][0]= s->mv[1][0][0]; s->last_mv[1][0][1]=s->last_mv[1][1][1]= s->mv[1][0][1]; s->b_count++; } }else{ assert(s->mv_type == MV_TYPE_FIELD); assert(!s->frame_pred_frame_dct); if (cbp){ // With coded bloc pattern if (s->dquant) { if(s->mv_dir == MV_DIR_FORWARD) put_mb_modes(s, 6, 3, 1, 1); else put_mb_modes(s, mb_type_len[s->mv_dir]+3, 2, 1, 1); put_bits(&s->pb, 5, s->qscale); } else { put_mb_modes(s, mb_type_len[s->mv_dir], 3, 1, 1); } }else{ // No coded bloc pattern put_bits(&s->pb, mb_type_len[s->mv_dir], 2); put_bits(&s->pb, 2, 1); /* motion_type: field */ s->qscale -= s->dquant; } s->misc_bits += get_bits_diff(s); if (s->mv_dir&MV_DIR_FORWARD){ for(i=0; i<2; i++){ put_bits(&s->pb, 1, s->field_select[0][i]); mpeg1_encode_motion(s, s->mv[0][i][0] - s->last_mv[0][i][0] , s->f_code); mpeg1_encode_motion(s, s->mv[0][i][1] - (s->last_mv[0][i][1]>>1), s->f_code); s->last_mv[0][i][0]= s->mv[0][i][0]; s->last_mv[0][i][1]= 2*s->mv[0][i][1]; } s->f_count++; } if (s->mv_dir&MV_DIR_BACKWARD){ for(i=0; i<2; i++){ put_bits(&s->pb, 1, s->field_select[1][i]); mpeg1_encode_motion(s, s->mv[1][i][0] - s->last_mv[1][i][0] , s->b_code); mpeg1_encode_motion(s, s->mv[1][i][1] - (s->last_mv[1][i][1]>>1), s->b_code); s->last_mv[1][i][0]= s->mv[1][i][0]; s->last_mv[1][i][1]= 2*s->mv[1][i][1]; } s->b_count++; } } s->mv_bits += get_bits_diff(s); if(cbp) put_bits(&s->pb, mbPatTable[cbp][1], mbPatTable[cbp][0]); } for(i=0;i<6;i++) { if (cbp & (1 << (5 - i))) { mpeg1_encode_block(s, block[i], i); } } s->mb_skip_run = 0; if(s->mb_intra) s->i_tex_bits+= get_bits_diff(s); else s->p_tex_bits+= get_bits_diff(s); } } // RAL: Parameter added: f_or_b_code static void mpeg1_encode_motion(MpegEncContext *s, int val, int f_or_b_code) { int code, bit_size, l, bits, range, sign; if (val == 0) { /* zero vector */ code = 0; put_bits(&s->pb, mbMotionVectorTable[0][1], mbMotionVectorTable[0][0]); } else { bit_size = f_or_b_code - 1; range = 1 << bit_size; /* modulo encoding */ l= INT_BIT - 5 - bit_size; val= (val<<l)>>l; if (val >= 0) { val--; code = (val >> bit_size) + 1; bits = val & (range - 1); sign = 0; } else { val = -val; val--; code = (val >> bit_size) + 1; bits = val & (range - 1); sign = 1; } assert(code > 0 && code <= 16); put_bits(&s->pb, mbMotionVectorTable[code][1], mbMotionVectorTable[code][0]); put_bits(&s->pb, 1, sign); if (bit_size > 0) { put_bits(&s->pb, bit_size, bits); } } } void ff_mpeg1_encode_init(MpegEncContext *s) { static int done=0; common_init(s); if(!done){ int f_code; int mv; int i; done=1; init_rl(&rl_mpeg1, 1); for(i=0; i<64; i++) { mpeg1_max_level[0][i]= rl_mpeg1.max_level[0][i]; mpeg1_index_run[0][i]= rl_mpeg1.index_run[0][i]; } init_uni_ac_vlc(&rl_mpeg1, uni_mpeg1_ac_vlc_bits, uni_mpeg1_ac_vlc_len); /* build unified dc encoding tables */ for(i=-255; i<256; i++) { int adiff, index; int bits, code; int diff=i; adiff = ABS(diff); if(diff<0) diff--; index = av_log2(2*adiff); bits= vlc_dc_lum_bits[index] + index; code= (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1)); mpeg1_lum_dc_uni[i+255]= bits + (code<<8); bits= vlc_dc_chroma_bits[index] + index; code= (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1)); mpeg1_chr_dc_uni[i+255]= bits + (code<<8); } mv_penalty= av_mallocz( sizeof(uint8_t)*(MAX_FCODE+1)*(2*MAX_MV+1) ); for(f_code=1; f_code<=MAX_FCODE; f_code++){ for(mv=-MAX_MV; mv<=MAX_MV; mv++){ int len; if(mv==0) len= mbMotionVectorTable[0][1]; else{ int val, bit_size, range, code; bit_size = f_code - 1; range = 1 << bit_size; val=mv; if (val < 0) val = -val; val--; code = (val >> bit_size) + 1; if(code<17){ len= mbMotionVectorTable[code][1] + 1 + bit_size; }else{ len= mbMotionVectorTable[16][1] + 2 + bit_size; } } mv_penalty[f_code][mv+MAX_MV]= len; } } for(f_code=MAX_FCODE; f_code>0; f_code--){ for(mv=-(8<<f_code); mv<(8<<f_code); mv++){ fcode_tab[mv+MAX_MV]= f_code; } } } s->me.mv_penalty= mv_penalty; s->fcode_tab= fcode_tab; if(s->codec_id == CODEC_ID_MPEG1VIDEO){ s->min_qcoeff=-255; s->max_qcoeff= 255; }else{ s->min_qcoeff=-2047; s->max_qcoeff= 2047; } s->intra_ac_vlc_length= s->inter_ac_vlc_length= s->intra_ac_vlc_last_length= s->inter_ac_vlc_last_length= uni_mpeg1_ac_vlc_len; } static inline void encode_dc(MpegEncContext *s, int diff, int component) { if(((unsigned) (diff+255)) >= 511){ int index; if(diff<0){ index= av_log2_16bit(-2*diff); diff--; }else{ index= av_log2_16bit(2*diff); } if (component == 0) { put_bits( &s->pb, vlc_dc_lum_bits[index] + index, (vlc_dc_lum_code[index]<<index) + (diff & ((1 << index) - 1))); }else{ put_bits( &s->pb, vlc_dc_chroma_bits[index] + index, (vlc_dc_chroma_code[index]<<index) + (diff & ((1 << index) - 1))); } }else{ if (component == 0) { put_bits( &s->pb, mpeg1_lum_dc_uni[diff+255]&0xFF, mpeg1_lum_dc_uni[diff+255]>>8); } else { put_bits( &s->pb, mpeg1_chr_dc_uni[diff+255]&0xFF, mpeg1_chr_dc_uni[diff+255]>>8); } } } static void mpeg1_encode_block(MpegEncContext *s, DCTELEM *block, int n) { int alevel, level, last_non_zero, dc, diff, i, j, run, last_index, sign; int code, component; // RLTable *rl = &rl_mpeg1; last_index = s->block_last_index[n]; /* DC coef */ if (s->mb_intra) { component = (n <= 3 ? 0 : n - 4 + 1); dc = block[0]; /* overflow is impossible */ diff = dc - s->last_dc[component]; encode_dc(s, diff, component); s->last_dc[component] = dc; i = 1; /* if (s->intra_vlc_format) rl = &rl_mpeg2; else rl = &rl_mpeg1; */ } else { /* encode the first coefficient : needs to be done here because it is handled slightly differently */ level = block[0]; if (abs(level) == 1) { code = ((uint32_t)level >> 31); /* the sign bit */ put_bits(&s->pb, 2, code | 0x02); i = 1; } else { i = 0; last_non_zero = -1; goto next_coef; } } /* now quantify & encode AC coefs */ last_non_zero = i - 1; for(;i<=last_index;i++) { j = s->intra_scantable.permutated[i]; level = block[j]; next_coef: #if 0 if (level != 0) dprintf("level[%d]=%dn", i, level); #endif /* encode using VLC */ if (level != 0) { run = i - last_non_zero - 1; alevel= level; MASK_ABS(sign, alevel) sign&=1; // code = get_rl_index(rl, 0, run, alevel); if (alevel <= mpeg1_max_level[0][run]){ code= mpeg1_index_run[0][run] + alevel - 1; /* store the vlc & sign at once */ put_bits(&s->pb, mpeg1_vlc[code][1]+1, (mpeg1_vlc[code][0]<<1) + sign); } else { /* escape seems to be pretty rare <5% so i dont optimize it */ put_bits(&s->pb, mpeg1_vlc[111/*rl->n*/][1], mpeg1_vlc[111/*rl->n*/][0]); /* escape: only clip in this case */ put_bits(&s->pb, 6, run); if(s->codec_id == CODEC_ID_MPEG1VIDEO){ if (alevel < 128) { put_bits(&s->pb, 8, level & 0xff); } else { if (level < 0) { put_bits(&s->pb, 16, 0x8001 + level + 255); } else { put_bits(&s->pb, 16, level & 0xffff); } } }else{ put_bits(&s->pb, 12, level & 0xfff); } } last_non_zero = i; } } /* end of block */ put_bits(&s->pb, 2, 0x2); } #endif //CONFIG_ENCODERS /******************************************/ /* decoding */ static VLC dc_lum_vlc; static VLC dc_chroma_vlc; static VLC mv_vlc; static VLC mbincr_vlc; static VLC mb_ptype_vlc; static VLC mb_btype_vlc; static VLC mb_pat_vlc; static void init_vlcs(void) { static int done = 0; if (!done) { done = 1; init_vlc(&dc_lum_vlc, DC_VLC_BITS, 12, vlc_dc_lum_bits, 1, 1, vlc_dc_lum_code, 2, 2, 1); init_vlc(&dc_chroma_vlc, DC_VLC_BITS, 12, vlc_dc_chroma_bits, 1, 1, vlc_dc_chroma_code, 2, 2, 1); init_vlc(&mv_vlc, MV_VLC_BITS, 17, &mbMotionVectorTable[0][1], 2, 1, &mbMotionVectorTable[0][0], 2, 1, 1); init_vlc(&mbincr_vlc, MBINCR_VLC_BITS, 36, &mbAddrIncrTable[0][1], 2, 1, &mbAddrIncrTable[0][0], 2, 1, 1); init_vlc(&mb_pat_vlc, MB_PAT_VLC_BITS, 64, &mbPatTable[0][1], 2, 1, &mbPatTable[0][0], 2, 1, 1); init_vlc(&mb_ptype_vlc, MB_PTYPE_VLC_BITS, 7, &table_mb_ptype[0][1], 2, 1, &table_mb_ptype[0][0], 2, 1, 1); init_vlc(&mb_btype_vlc, MB_BTYPE_VLC_BITS, 11, &table_mb_btype[0][1], 2, 1, &table_mb_btype[0][0], 2, 1, 1); init_rl(&rl_mpeg1, 1); init_rl(&rl_mpeg2, 1); init_2d_vlc_rl(&rl_mpeg1, 1); init_2d_vlc_rl(&rl_mpeg2, 1); } } static inline int get_dmv(MpegEncContext *s) { if(get_bits1(&s->gb)) return 1 - (get_bits1(&s->gb) << 1); else return 0; } static inline int get_qscale(MpegEncContext *s) { int qscale = get_bits(&s->gb, 5); if (s->q_scale_type) { return non_linear_qscale[qscale]; } else { return qscale << 1; } } /* motion type (for mpeg2) */ #define MT_FIELD 1 #define MT_FRAME 2 #define MT_16X8 2 #define MT_DMV 3 static int mpeg_decode_mb(MpegEncContext *s, DCTELEM block[12][64]) { int i, j, k, cbp, val, mb_type, motion_type; const int mb_block_count = 4 + (1<< s->chroma_format); dprintf("decode_mb: x=%d y=%dn", s->mb_x, s->mb_y); assert(s->mb_skipped==0); if (s->mb_skip_run-- != 0) { if(s->pict_type == I_TYPE){ av_log(s->avctx, AV_LOG_ERROR, "skipped MB in I frame at %d %dn", s->mb_x, s->mb_y); return -1; } /* skip mb */ s->mb_intra = 0; for(i=0;i<12;i++) s->block_last_index[i] = -1; if(s->picture_structure == PICT_FRAME) s->mv_type = MV_TYPE_16X16; else s->mv_type = MV_TYPE_FIELD; if (s->pict_type == P_TYPE) { /* if P type, zero motion vector is implied */ s->mv_dir = MV_DIR_FORWARD; s->mv[0][0][0] = s->mv[0][0][1] = 0; s->last_mv[0][0][0] = s->last_mv[0][0][1] = 0; s->last_mv[0][1][0] = s->last_mv[0][1][1] = 0; s->field_select[0][0]= s->picture_structure - 1; s->mb_skipped = 1; s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= MB_TYPE_SKIP | MB_TYPE_L0 | MB_TYPE_16x16; } else { int mb_type; if(s->mb_x) mb_type= s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]; else mb_type= s->current_picture.mb_type[ s->mb_width + (s->mb_y-1)*s->mb_stride - 1]; // FIXME not sure if this is allowed in mpeg at all, if(IS_INTRA(mb_type)) return -1; /* if B type, reuse previous vectors and directions */ s->mv[0][0][0] = s->last_mv[0][0][0]; s->mv[0][0][1] = s->last_mv[0][0][1]; s->mv[1][0][0] = s->last_mv[1][0][0]; s->mv[1][0][1] = s->last_mv[1][0][1]; s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type | MB_TYPE_SKIP; // assert(s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride - 1]&(MB_TYPE_16x16|MB_TYPE_16x8)); if((s->mv[0][0][0]|s->mv[0][0][1]|s->mv[1][0][0]|s->mv[1][0][1])==0) s->mb_skipped = 1; } return 0; } switch(s->pict_type) { default: case I_TYPE: if (get_bits1(&s->gb) == 0) { if (get_bits1(&s->gb) == 0){ av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in I Frame at %d %dn", s->mb_x, s->mb_y); return -1; } mb_type = MB_TYPE_QUANT | MB_TYPE_INTRA; } else { mb_type = MB_TYPE_INTRA; } break; case P_TYPE: mb_type = get_vlc2(&s->gb, mb_ptype_vlc.table, MB_PTYPE_VLC_BITS, 1); if (mb_type < 0){ av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in P Frame at %d %dn", s->mb_x, s->mb_y); return -1; } mb_type = ptype2mb_type[ mb_type ]; break; case B_TYPE: mb_type = get_vlc2(&s->gb, mb_btype_vlc.table, MB_BTYPE_VLC_BITS, 1); if (mb_type < 0){ av_log(s->avctx, AV_LOG_ERROR, "invalid mb type in B Frame at %d %dn", s->mb_x, s->mb_y); return -1; } mb_type = btype2mb_type[ mb_type ]; break; } dprintf("mb_type=%xn", mb_type); // motion_type = 0; /* avoid warning */ if (IS_INTRA(mb_type)) { s->dsp.clear_blocks(s->block[0]); if(!s->chroma_y_shift){ s->dsp.clear_blocks(s->block[6]); } /* compute dct type */ if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var? !s->frame_pred_frame_dct) { s->interlaced_dct = get_bits1(&s->gb); } if (IS_QUANT(mb_type)) s->qscale = get_qscale(s); if (s->concealment_motion_vectors) { /* just parse them */ if (s->picture_structure != PICT_FRAME) skip_bits1(&s->gb); /* field select */ s->mv[0][0][0]= s->last_mv[0][0][0]= s->last_mv[0][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[0][0], s->last_mv[0][0][0]); s->mv[0][0][1]= s->last_mv[0][0][1]= s->last_mv[0][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[0][1], s->last_mv[0][0][1]); skip_bits1(&s->gb); /* marker */ }else memset(s->last_mv, 0, sizeof(s->last_mv)); /* reset mv prediction */ s->mb_intra = 1; #ifdef HAVE_XVMC //one 1 we memcpy blocks in xvmcvideo if(s->avctx->xvmc_acceleration > 1){ XVMC_pack_pblocks(s,-1);//inter are always full blocks if(s->swap_uv){ exchange_uv(s); } } #endif if (s->codec_id == CODEC_ID_MPEG2VIDEO) { if(s->flags2 & CODEC_FLAG2_FAST){ for(i=0;i<6;i++) { mpeg2_fast_decode_block_intra(s, s->pblocks[i], i); } }else{ for(i=0;i<mb_block_count;i++) { if (mpeg2_decode_block_intra(s, s->pblocks[i], i) < 0) return -1; } } } else { for(i=0;i<6;i++) { if (mpeg1_decode_block_intra(s, s->pblocks[i], i) < 0) return -1; } } } else { if (mb_type & MB_TYPE_ZERO_MV){ assert(mb_type & MB_TYPE_CBP); /* compute dct type */ if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var? !s->frame_pred_frame_dct) { s->interlaced_dct = get_bits1(&s->gb); } if (IS_QUANT(mb_type)) s->qscale = get_qscale(s); s->mv_dir = MV_DIR_FORWARD; if(s->picture_structure == PICT_FRAME) s->mv_type = MV_TYPE_16X16; else{ s->mv_type = MV_TYPE_FIELD; mb_type |= MB_TYPE_INTERLACED; s->field_select[0][0]= s->picture_structure - 1; } s->last_mv[0][0][0] = 0; s->last_mv[0][0][1] = 0; s->last_mv[0][1][0] = 0; s->last_mv[0][1][1] = 0; s->mv[0][0][0] = 0; s->mv[0][0][1] = 0; }else{ assert(mb_type & MB_TYPE_L0L1); //FIXME decide if MBs in field pictures are MB_TYPE_INTERLACED /* get additionnal motion vector type */ if (s->frame_pred_frame_dct) motion_type = MT_FRAME; else{ motion_type = get_bits(&s->gb, 2); } /* compute dct type */ if (s->picture_structure == PICT_FRAME && //FIXME add a interlaced_dct coded var? !s->frame_pred_frame_dct && HAS_CBP(mb_type)) { s->interlaced_dct = get_bits1(&s->gb); } if (IS_QUANT(mb_type)) s->qscale = get_qscale(s); /* motion vectors */ s->mv_dir = 0; for(i=0;i<2;i++) { if (USES_LIST(mb_type, i)) { s->mv_dir |= (MV_DIR_FORWARD >> i); dprintf("motion_type=%dn", motion_type); switch(motion_type) { case MT_FRAME: /* or MT_16X8 */ if (s->picture_structure == PICT_FRAME) { /* MT_FRAME */ mb_type |= MB_TYPE_16x16; s->mv_type = MV_TYPE_16X16; s->mv[i][0][0]= s->last_mv[i][0][0]= s->last_mv[i][1][0] = mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]); s->mv[i][0][1]= s->last_mv[i][0][1]= s->last_mv[i][1][1] = mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1]); /* full_pel: only for mpeg1 */ if (s->full_pel[i]){ s->mv[i][0][0] <<= 1; s->mv[i][0][1] <<= 1; } } else { /* MT_16X8 */ mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED; s->mv_type = MV_TYPE_16X8; for(j=0;j<2;j++) { s->field_select[i][j] = get_bits1(&s->gb); for(k=0;k<2;k++) { val = mpeg_decode_motion(s, s->mpeg_f_code[i][k], s->last_mv[i][j][k]); s->last_mv[i][j][k] = val; s->mv[i][j][k] = val; } } } break; case MT_FIELD: s->mv_type = MV_TYPE_FIELD; if (s->picture_structure == PICT_FRAME) { mb_type |= MB_TYPE_16x8 | MB_TYPE_INTERLACED; for(j=0;j<2;j++) { s->field_select[i][j] = get_bits1(&s->gb); val = mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][j][0]); s->last_mv[i][j][0] = val; s->mv[i][j][0] = val; dprintf("fmx=%dn", val); val = mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][j][1] >> 1); s->last_mv[i][j][1] = val << 1; s->mv[i][j][1] = val; dprintf("fmy=%dn", val); } } else { mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED; s->field_select[i][0] = get_bits1(&s->gb); for(k=0;k<2;k++) { val = mpeg_decode_motion(s, s->mpeg_f_code[i][k], s->last_mv[i][0][k]); s->last_mv[i][0][k] = val; s->last_mv[i][1][k] = val; s->mv[i][0][k] = val; } } break; case MT_DMV: { int dmx, dmy, mx, my, m; mx = mpeg_decode_motion(s, s->mpeg_f_code[i][0], s->last_mv[i][0][0]); s->last_mv[i][0][0] = mx; s->last_mv[i][1][0] = mx; dmx = get_dmv(s); my = mpeg_decode_motion(s, s->mpeg_f_code[i][1], s->last_mv[i][0][1] >> 1); dmy = get_dmv(s); s->mv_type = MV_TYPE_DMV; s->last_mv[i][0][1] = my<<1; s->last_mv[i][1][1] = my<<1; s->mv[i][0][0] = mx; s->mv[i][0][1] = my; s->mv[i][1][0] = mx;//not used s->mv[i][1][1] = my;//not used if (s->picture_structure == PICT_FRAME) { mb_type |= MB_TYPE_16x16 | MB_TYPE_INTERLACED; //m = 1 + 2 * s->top_field_first; m = s->top_field_first ? 1 : 3; /* top -> top pred */ s->mv[i][2][0] = ((mx * m + (mx > 0)) >> 1) + dmx; s->mv[i][2][1] = ((my * m + (my > 0)) >> 1) + dmy - 1; m = 4 - m; s->mv[i][3][0] = ((mx * m + (mx > 0)) >> 1) + dmx; s->mv[i][3][1] = ((my * m + (my > 0)) >> 1) + dmy + 1; } else { mb_type |= MB_TYPE_16x16; s->mv[i][2][0] = ((mx + (mx > 0)) >> 1) + dmx; s->mv[i][2][1] = ((my + (my > 0)) >> 1) + dmy; if(s->picture_structure == PICT_TOP_FIELD) s->mv[i][2][1]--; else s->mv[i][2][1]++; } } break; default: av_log(s->avctx, AV_LOG_ERROR, "00 motion_type at %d %dn", s->mb_x, s->mb_y); return -1; } } } } s->mb_intra = 0; if (HAS_CBP(mb_type)) { s->dsp.clear_blocks(s->block[0]); if(!s->chroma_y_shift){ s->dsp.clear_blocks(s->block[6]); } cbp = get_vlc2(&s->gb, mb_pat_vlc.table, MB_PAT_VLC_BITS, 1); if (cbp < 0 || ((cbp == 0) && (s->chroma_format < 2)) ){ av_log(s->avctx, AV_LOG_ERROR, "invalid cbp at %d %dn", s->mb_x, s->mb_y); return -1; } if(mb_block_count > 6){ cbp<<= mb_block_count-6; cbp |= get_bits(&s->gb, mb_block_count-6); } #ifdef HAVE_XVMC //on 1 we memcpy blocks in xvmcvideo if(s->avctx->xvmc_acceleration > 1){ XVMC_pack_pblocks(s,cbp); if(s->swap_uv){ exchange_uv(s); } } #endif if (s->codec_id == CODEC_ID_MPEG2VIDEO) { if(s->flags2 & CODEC_FLAG2_FAST){ for(i=0;i<6;i++) { if(cbp & 32) { mpeg2_fast_decode_block_non_intra(s, s->pblocks[i], i); } else { s->block_last_index[i] = -1; } cbp+=cbp; } }else{ cbp<<= 12-mb_block_count; for(i=0;i<mb_block_count;i++) { if ( cbp & (1<<11) ) { if (mpeg2_decode_block_non_intra(s, s->pblocks[i], i) < 0) return -1; } else { s->block_last_index[i] = -1; } cbp+=cbp; } } } else { if(s->flags2 & CODEC_FLAG2_FAST){ for(i=0;i<6;i++) { if (cbp & 32) { mpeg1_fast_decode_block_inter(s, s->pblocks[i], i); } else { s->block_last_index[i] = -1; } cbp+=cbp; } }else{ for(i=0;i<6;i++) { if (cbp & 32) { if (mpeg1_decode_block_inter(s, s->pblocks[i], i) < 0) return -1; } else { s->block_last_index[i] = -1; } cbp+=cbp; } } } }else{ for(i=0;i<6;i++) s->block_last_index[i] = -1; } } s->current_picture.mb_type[ s->mb_x + s->mb_y*s->mb_stride ]= mb_type; return 0; } /* as h263, but only 17 codes */ static int mpeg_decode_motion(MpegEncContext *s, int fcode, int pred) { int code, sign, val, l, shift; code = get_vlc2(&s->gb, mv_vlc.table, MV_VLC_BITS, 2); if (code == 0) { return pred; } if (code < 0) { return 0xffff; } sign = get_bits1(&s->gb); shift = fcode - 1; val = code; if (shift) { val = (val - 1) << shift; val |= get_bits(&s->gb, shift); val++; } if (sign) val = -val; val += pred; /* modulo decoding */ l= INT_BIT - 5 - shift; val = (val<<l)>>l; return val; } static inline int decode_dc(GetBitContext *gb, int component) { int code, diff; if (component == 0) { code = get_vlc2(gb, dc_lum_vlc.table, DC_VLC_BITS, 2); } else { code = get_vlc2(gb, dc_chroma_vlc.table, DC_VLC_BITS, 2); } if (code < 0){ av_log(NULL, AV_LOG_ERROR, "invalid dc code atn"); return 0xffff; } if (code == 0) { diff = 0; } else { diff = get_xbits(gb, code); } return diff; } static inline int mpeg1_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n) { int level, dc, diff, i, j, run; int component; RLTable *rl = &rl_mpeg1; uint8_t * const scantable= s->intra_scantable.permutated; const uint16_t *quant_matrix= s->intra_matrix; const int qscale= s->qscale; /* DC coef */ component = (n <= 3 ? 0 : n - 4 + 1); diff = decode_dc(&s->gb, component); if (diff >= 0xffff) return -1; dc = s->last_dc[component]; dc += diff; s->last_dc[component] = dc; block[0] = dc<<3; dprintf("dc=%d diff=%dn", dc, diff); i = 0; { OPEN_READER(re, &s->gb); /* now quantify & encode AC coefs */ for(;;) { UPDATE_CACHE(re, &s->gb); GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); if(level == 127){ break; } else if(level != 0) { i += run; j = scantable[i]; level= (level*qscale*quant_matrix[j])>>4; level= (level-1)|1; level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); LAST_SKIP_BITS(re, &s->gb, 1); } else { /* escape */ run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6); UPDATE_CACHE(re, &s->gb); level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8); if (level == -128) { level = SHOW_UBITS(re, &s->gb, 8) - 256; LAST_SKIP_BITS(re, &s->gb, 8); } else if (level == 0) { level = SHOW_UBITS(re, &s->gb, 8) ; LAST_SKIP_BITS(re, &s->gb, 8); } i += run; j = scantable[i]; if(level<0){ level= -level; level= (level*qscale*quant_matrix[j])>>4; level= (level-1)|1; level= -level; }else{ level= (level*qscale*quant_matrix[j])>>4; level= (level-1)|1; } } if (i > 63){ av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %dn", s->mb_x, s->mb_y); return -1; } block[j] = level; } CLOSE_READER(re, &s->gb); } s->block_last_index[n] = i; return 0; } static inline int mpeg1_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n) { int level, i, j, run; RLTable *rl = &rl_mpeg1; uint8_t * const scantable= s->intra_scantable.permutated; const uint16_t *quant_matrix= s->inter_matrix; const int qscale= s->qscale; { OPEN_READER(re, &s->gb); i = -1; /* special case for the first coef. no need to add a second vlc table */ UPDATE_CACHE(re, &s->gb); if (((int32_t)GET_CACHE(re, &s->gb)) < 0) { level= (3*qscale*quant_matrix[0])>>5; level= (level-1)|1; if(GET_CACHE(re, &s->gb)&0x40000000) level= -level; block[0] = level; i++; SKIP_BITS(re, &s->gb, 2); if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF) goto end; } /* now quantify & encode AC coefs */ for(;;) { GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); if(level != 0) { i += run; j = scantable[i]; level= ((level*2+1)*qscale*quant_matrix[j])>>5; level= (level-1)|1; level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1); } else { /* escape */ run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6); UPDATE_CACHE(re, &s->gb); level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8); if (level == -128) { level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8); } else if (level == 0) { level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8); } i += run; j = scantable[i]; if(level<0){ level= -level; level= ((level*2+1)*qscale*quant_matrix[j])>>5; level= (level-1)|1; level= -level; }else{ level= ((level*2+1)*qscale*quant_matrix[j])>>5; level= (level-1)|1; } } if (i > 63){ av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %dn", s->mb_x, s->mb_y); return -1; } block[j] = level; if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF) break; UPDATE_CACHE(re, &s->gb); } end: LAST_SKIP_BITS(re, &s->gb, 2); CLOSE_READER(re, &s->gb); } s->block_last_index[n] = i; return 0; } static inline int mpeg1_fast_decode_block_inter(MpegEncContext *s, DCTELEM *block, int n) { int level, i, j, run; RLTable *rl = &rl_mpeg1; uint8_t * const scantable= s->intra_scantable.permutated; const int qscale= s->qscale; { OPEN_READER(re, &s->gb); i = -1; /* special case for the first coef. no need to add a second vlc table */ UPDATE_CACHE(re, &s->gb); if (((int32_t)GET_CACHE(re, &s->gb)) < 0) { level= (3*qscale)>>1; level= (level-1)|1; if(GET_CACHE(re, &s->gb)&0x40000000) level= -level; block[0] = level; i++; SKIP_BITS(re, &s->gb, 2); if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF) goto end; } /* now quantify & encode AC coefs */ for(;;) { GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); if(level != 0) { i += run; j = scantable[i]; level= ((level*2+1)*qscale)>>1; level= (level-1)|1; level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1); } else { /* escape */ run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6); UPDATE_CACHE(re, &s->gb); level = SHOW_SBITS(re, &s->gb, 8); SKIP_BITS(re, &s->gb, 8); if (level == -128) { level = SHOW_UBITS(re, &s->gb, 8) - 256; SKIP_BITS(re, &s->gb, 8); } else if (level == 0) { level = SHOW_UBITS(re, &s->gb, 8) ; SKIP_BITS(re, &s->gb, 8); } i += run; j = scantable[i]; if(level<0){ level= -level; level= ((level*2+1)*qscale)>>1; level= (level-1)|1; level= -level; }else{ level= ((level*2+1)*qscale)>>1; level= (level-1)|1; } } block[j] = level; if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF) break; UPDATE_CACHE(re, &s->gb); } end: LAST_SKIP_BITS(re, &s->gb, 2); CLOSE_READER(re, &s->gb); } s->block_last_index[n] = i; return 0; } static inline int mpeg2_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n) { int level, i, j, run; RLTable *rl = &rl_mpeg1; uint8_t * const scantable= s->intra_scantable.permutated; const uint16_t *quant_matrix; const int qscale= s->qscale; int mismatch; mismatch = 1; { OPEN_READER(re, &s->gb); i = -1; if (n < 4) quant_matrix = s->inter_matrix; else quant_matrix = s->chroma_inter_matrix; /* special case for the first coef. no need to add a second vlc table */ UPDATE_CACHE(re, &s->gb); if (((int32_t)GET_CACHE(re, &s->gb)) < 0) { level= (3*qscale*quant_matrix[0])>>5; if(GET_CACHE(re, &s->gb)&0x40000000) level= -level; block[0] = level; mismatch ^= level; i++; SKIP_BITS(re, &s->gb, 2); if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF) goto end; } /* now quantify & encode AC coefs */ for(;;) { GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); if(level != 0) { i += run; j = scantable[i]; level= ((level*2+1)*qscale*quant_matrix[j])>>5; level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1); } else { /* escape */ run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6); UPDATE_CACHE(re, &s->gb); level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12); i += run; j = scantable[i]; if(level<0){ level= ((-level*2+1)*qscale*quant_matrix[j])>>5; level= -level; }else{ level= ((level*2+1)*qscale*quant_matrix[j])>>5; } } if (i > 63){ av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %dn", s->mb_x, s->mb_y); return -1; } mismatch ^= level; block[j] = level; if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF) break; UPDATE_CACHE(re, &s->gb); } end: LAST_SKIP_BITS(re, &s->gb, 2); CLOSE_READER(re, &s->gb); } block[63] ^= (mismatch & 1); s->block_last_index[n] = i; return 0; } static inline int mpeg2_fast_decode_block_non_intra(MpegEncContext *s, DCTELEM *block, int n) { int level, i, j, run; RLTable *rl = &rl_mpeg1; uint8_t * const scantable= s->intra_scantable.permutated; const int qscale= s->qscale; OPEN_READER(re, &s->gb); i = -1; /* special case for the first coef. no need to add a second vlc table */ UPDATE_CACHE(re, &s->gb); if (((int32_t)GET_CACHE(re, &s->gb)) < 0) { level= (3*qscale)>>1; if(GET_CACHE(re, &s->gb)&0x40000000) level= -level; block[0] = level; i++; SKIP_BITS(re, &s->gb, 2); if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF) goto end; } /* now quantify & encode AC coefs */ for(;;) { GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); if(level != 0) { i += run; j = scantable[i]; level= ((level*2+1)*qscale)>>1; level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); SKIP_BITS(re, &s->gb, 1); } else { /* escape */ run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6); UPDATE_CACHE(re, &s->gb); level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12); i += run; j = scantable[i]; if(level<0){ level= ((-level*2+1)*qscale)>>1; level= -level; }else{ level= ((level*2+1)*qscale)>>1; } } block[j] = level; if(((int32_t)GET_CACHE(re, &s->gb)) <= (int32_t)0xBFFFFFFF) break; UPDATE_CACHE(re, &s->gb); } end: LAST_SKIP_BITS(re, &s->gb, 2); CLOSE_READER(re, &s->gb); s->block_last_index[n] = i; return 0; } static inline int mpeg2_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n) { int level, dc, diff, i, j, run; int component; RLTable *rl; uint8_t * const scantable= s->intra_scantable.permutated; const uint16_t *quant_matrix; const int qscale= s->qscale; int mismatch; /* DC coef */ if (n < 4){ quant_matrix = s->intra_matrix; component = 0; }else{ quant_matrix = s->chroma_intra_matrix; component = (n&1) + 1; } diff = decode_dc(&s->gb, component); if (diff >= 0xffff) return -1; dc = s->last_dc[component]; dc += diff; s->last_dc[component] = dc; block[0] = dc << (3 - s->intra_dc_precision); dprintf("dc=%dn", block[0]); mismatch = block[0] ^ 1; i = 0; if (s->intra_vlc_format) rl = &rl_mpeg2; else rl = &rl_mpeg1; { OPEN_READER(re, &s->gb); /* now quantify & encode AC coefs */ for(;;) { UPDATE_CACHE(re, &s->gb); GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); if(level == 127){ break; } else if(level != 0) { i += run; j = scantable[i]; level= (level*qscale*quant_matrix[j])>>4; level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); LAST_SKIP_BITS(re, &s->gb, 1); } else { /* escape */ run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6); UPDATE_CACHE(re, &s->gb); level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12); i += run; j = scantable[i]; if(level<0){ level= (-level*qscale*quant_matrix[j])>>4; level= -level; }else{ level= (level*qscale*quant_matrix[j])>>4; } } if (i > 63){ av_log(s->avctx, AV_LOG_ERROR, "ac-tex damaged at %d %dn", s->mb_x, s->mb_y); return -1; } mismatch^= level; block[j] = level; } CLOSE_READER(re, &s->gb); } block[63]^= mismatch&1; s->block_last_index[n] = i; return 0; } static inline int mpeg2_fast_decode_block_intra(MpegEncContext *s, DCTELEM *block, int n) { int level, dc, diff, j, run; int component; RLTable *rl; uint8_t * scantable= s->intra_scantable.permutated; const uint16_t *quant_matrix; const int qscale= s->qscale; /* DC coef */ if (n < 4){ quant_matrix = s->intra_matrix; component = 0; }else{ quant_matrix = s->chroma_intra_matrix; component = (n&1) + 1; } diff = decode_dc(&s->gb, component); if (diff >= 0xffff) return -1; dc = s->last_dc[component]; dc += diff; s->last_dc[component] = dc; block[0] = dc << (3 - s->intra_dc_precision); if (s->intra_vlc_format) rl = &rl_mpeg2; else rl = &rl_mpeg1; { OPEN_READER(re, &s->gb); /* now quantify & encode AC coefs */ for(;;) { UPDATE_CACHE(re, &s->gb); GET_RL_VLC(level, run, re, &s->gb, rl->rl_vlc[0], TEX_VLC_BITS, 2, 0); if(level == 127){ break; } else if(level != 0) { scantable += run; j = *scantable; level= (level*qscale*quant_matrix[j])>>4; level = (level ^ SHOW_SBITS(re, &s->gb, 1)) - SHOW_SBITS(re, &s->gb, 1); LAST_SKIP_BITS(re, &s->gb, 1); } else { /* escape */ run = SHOW_UBITS(re, &s->gb, 6)+1; LAST_SKIP_BITS(re, &s->gb, 6); UPDATE_CACHE(re, &s->gb); level = SHOW_SBITS(re, &s->gb, 12); SKIP_BITS(re, &s->gb, 12); scantable += run; j = *scantable; if(level<0){ level= (-level*qscale*quant_matrix[j])>>4; level= -level; }else{ level= (level*qscale*quant_matrix[j])>>4; } } block[j] = level; } CLOSE_READER(re, &s->gb); } s->block_last_index[n] = scantable - s->intra_scantable.permutated; return 0; } typedef struct Mpeg1Context { MpegEncContext mpeg_enc_ctx; int mpeg_enc_ctx_allocated; /* true if decoding context allocated */ int repeat_field; /* true if we must repeat the field */ AVPanScan pan_scan; /** some temporary storage for the panscan */ int slice_count; int swap_uv;//indicate VCR2 int save_aspect_info; AVRational frame_rate_ext; ///< MPEG-2 specific framerate modificator } Mpeg1Context; static int mpeg_decode_init(AVCodecContext *avctx) { Mpeg1Context *s = avctx->priv_data; MpegEncContext *s2 = &s->mpeg_enc_ctx; int i; //we need some parmutation to store //matrixes, until MPV_common_init() //set the real permutatuon for(i=0;i<64;i++) s2->dsp.idct_permutation[i]=i; MPV_decode_defaults(s2); s->mpeg_enc_ctx.avctx= avctx; s->mpeg_enc_ctx.flags= avctx->flags; s->mpeg_enc_ctx.flags2= avctx->flags2; common_init(&s->mpeg_enc_ctx); init_vlcs(); s->mpeg_enc_ctx_allocated = 0; s->mpeg_enc_ctx.picture_number = 0; s->repeat_field = 0; s->mpeg_enc_ctx.codec_id= avctx->codec->id; return 0; } static void quant_matrix_rebuild(uint16_t *matrix, const uint8_t *old_perm, const uint8_t *new_perm){ uint16_t temp_matrix[64]; int i; memcpy(temp_matrix,matrix,64*sizeof(uint16_t)); for(i=0;i<64;i++){ matrix[new_perm[i]] = temp_matrix[old_perm[i]]; } } //Call this function when we know all parameters //it may be called in different places for mpeg1 and mpeg2 static int mpeg_decode_postinit(AVCodecContext *avctx){ Mpeg1Context *s1 = avctx->priv_data; MpegEncContext *s = &s1->mpeg_enc_ctx; uint8_t old_permutation[64]; if ( (s1->mpeg_enc_ctx_allocated == 0)|| avctx->coded_width != s->width || avctx->coded_height != s->height|| s1->save_aspect_info != s->aspect_ratio_info|| 0) { if (s1->mpeg_enc_ctx_allocated) { ParseContext pc= s->parse_context; s->parse_context.buffer=0; MPV_common_end(s); s->parse_context= pc; } if( (s->width == 0 )||(s->height == 0)) return -2; avcodec_set_dimensions(avctx, s->width, s->height); avctx->bit_rate = s->bit_rate; s1->save_aspect_info = s->aspect_ratio_info; //low_delay may be forced, in this case we will have B frames //that behave like P frames avctx->has_b_frames = !(s->low_delay); if(avctx->sub_id==1){//s->codec_id==avctx->codec_id==CODEC_ID //mpeg1 fps avctx->time_base.den = frame_rate_tab[s->frame_rate_index].num; avctx->time_base.num= frame_rate_tab[s->frame_rate_index].den; //mpeg1 aspect avctx->sample_aspect_ratio= av_d2q( 1.0/mpeg1_aspect[s->aspect_ratio_info], 255); }else{//mpeg2 //mpeg2 fps av_reduce( &s->avctx->time_base.den, &s->avctx->time_base.num, frame_rate_tab[s->frame_rate_index].num * s1->frame_rate_ext.num, frame_rate_tab[s->frame_rate_index].den * s1->frame_rate_ext.den, 1<<30); //mpeg2 aspect if(s->aspect_ratio_info > 1){ if( (s1->pan_scan.width == 0 )||(s1->pan_scan.height == 0) ){ s->avctx->sample_aspect_ratio= av_div_q( mpeg2_aspect[s->aspect_ratio_info], _AVRational(s->width, s->height) //Picard
- ); }else{ s->avctx->sample_aspect_ratio= av_div_q( mpeg2_aspect[s->aspect_ratio_info], _AVRational(s1->pan_scan.width, s1->pan_scan.height) //Picard
- ); } }else{ s->avctx->sample_aspect_ratio= mpeg2_aspect[s->aspect_ratio_info]; } }//mpeg2 if(avctx->xvmc_acceleration){ avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420); }else{ if(s->chroma_format < 2){ avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420); }else if(s->chroma_format == 2){ avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_422); }else if(s->chroma_format > 2){ avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_444); } } //until then pix_fmt may be changed right after codec init if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT ) if( avctx->idct_algo == FF_IDCT_AUTO ) avctx->idct_algo = FF_IDCT_SIMPLE; //quantization matrixes may need reordering //if dct permutation is changed memcpy(old_permutation,s->dsp.idct_permutation,64*sizeof(uint8_t)); if (MPV_common_init(s) < 0) return -2; quant_matrix_rebuild(s->intra_matrix, old_permutation,s->dsp.idct_permutation); quant_matrix_rebuild(s->inter_matrix, old_permutation,s->dsp.idct_permutation); quant_matrix_rebuild(s->chroma_intra_matrix,old_permutation,s->dsp.idct_permutation); quant_matrix_rebuild(s->chroma_inter_matrix,old_permutation,s->dsp.idct_permutation); s1->mpeg_enc_ctx_allocated = 1; } return 0; } /* return the 8 bit start code value and update the search state. Return -1 if no start code found */ static int find_start_code(const uint8_t **pbuf_ptr, const uint8_t *buf_end) { const uint8_t *buf_ptr= *pbuf_ptr; buf_ptr++; //gurantees that -1 is within the array buf_end -= 2; // gurantees that +2 is within the array while (buf_ptr < buf_end) { if(*buf_ptr==0){ while(buf_ptr < buf_end && buf_ptr[1]==0) buf_ptr++; if(buf_ptr[-1] == 0 && buf_ptr[1] == 1){ *pbuf_ptr = buf_ptr+3; return buf_ptr[2] + 0x100; } } buf_ptr += 2; } buf_end += 2; //undo the hack above *pbuf_ptr = buf_end; return -1; } static int mpeg1_decode_picture(AVCodecContext *avctx, const uint8_t *buf, int buf_size) { Mpeg1Context *s1 = avctx->priv_data; MpegEncContext *s = &s1->mpeg_enc_ctx; int ref, f_code, vbv_delay; if(mpeg_decode_postinit(s->avctx) < 0) return -2; init_get_bits(&s->gb, buf, buf_size*8); ref = get_bits(&s->gb, 10); /* temporal ref */ s->pict_type = get_bits(&s->gb, 3); if(s->pict_type == 0 || s->pict_type > 3) return -1; vbv_delay= get_bits(&s->gb, 16); if (s->pict_type == P_TYPE || s->pict_type == B_TYPE) { s->full_pel[0] = get_bits1(&s->gb); f_code = get_bits(&s->gb, 3); if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT) return -1; s->mpeg_f_code[0][0] = f_code; s->mpeg_f_code[0][1] = f_code; } if (s->pict_type == B_TYPE) { s->full_pel[1] = get_bits1(&s->gb); f_code = get_bits(&s->gb, 3); if (f_code == 0 && avctx->error_resilience >= FF_ER_COMPLIANT) return -1; s->mpeg_f_code[1][0] = f_code; s->mpeg_f_code[1][1] = f_code; } s->current_picture.pict_type= s->pict_type; s->current_picture.key_frame= s->pict_type == I_TYPE; if(avctx->debug & FF_DEBUG_PICT_INFO) av_log(avctx, AV_LOG_DEBUG, "vbv_delay %d, ref %d type:%dn", vbv_delay, ref, s->pict_type); s->y_dc_scale = 8; s->c_dc_scale = 8; s->first_slice = 1; return 0; } static void mpeg_decode_sequence_extension(Mpeg1Context *s1) { MpegEncContext *s= &s1->mpeg_enc_ctx; int horiz_size_ext, vert_size_ext; int bit_rate_ext; skip_bits(&s->gb, 1); /* profil and level esc*/ s->avctx->profile= get_bits(&s->gb, 3); s->avctx->level= get_bits(&s->gb, 4); s->progressive_sequence = get_bits1(&s->gb); /* progressive_sequence */ s->chroma_format = get_bits(&s->gb, 2); /* chroma_format 1=420, 2=422, 3=444 */ horiz_size_ext = get_bits(&s->gb, 2); vert_size_ext = get_bits(&s->gb, 2); s->width |= (horiz_size_ext << 12); s->height |= (vert_size_ext << 12); bit_rate_ext = get_bits(&s->gb, 12); /* XXX: handle it */ s->bit_rate += (bit_rate_ext << 18) * 400; skip_bits1(&s->gb); /* marker */ s->avctx->rc_buffer_size += get_bits(&s->gb, 8)*1024*16<<10; s->low_delay = get_bits1(&s->gb); if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1; s1->frame_rate_ext.num = get_bits(&s->gb, 2)+1; s1->frame_rate_ext.den = get_bits(&s->gb, 5)+1; dprintf("sequence extensionn"); s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO; s->avctx->sub_id = 2; /* indicates mpeg2 found */ if(s->avctx->debug & FF_DEBUG_PICT_INFO) av_log(s->avctx, AV_LOG_DEBUG, "profile: %d, level: %d vbv buffer: %d, bitrate:%dn", s->avctx->profile, s->avctx->level, s->avctx->rc_buffer_size, s->bit_rate); } static void mpeg_decode_sequence_display_extension(Mpeg1Context *s1) { MpegEncContext *s= &s1->mpeg_enc_ctx; int color_description, w, h; skip_bits(&s->gb, 3); /* video format */ color_description= get_bits1(&s->gb); if(color_description){ skip_bits(&s->gb, 8); /* color primaries */ skip_bits(&s->gb, 8); /* transfer_characteristics */ skip_bits(&s->gb, 8); /* matrix_coefficients */ } w= get_bits(&s->gb, 14); skip_bits(&s->gb, 1); //marker h= get_bits(&s->gb, 14); skip_bits(&s->gb, 1); //marker s1->pan_scan.width= 16*w; s1->pan_scan.height=16*h; if(s->avctx->debug & FF_DEBUG_PICT_INFO) av_log(s->avctx, AV_LOG_DEBUG, "sde w:%d, h:%dn", w, h); } static void mpeg_decode_picture_display_extension(Mpeg1Context *s1) { MpegEncContext *s= &s1->mpeg_enc_ctx; int i,nofco; nofco = 1; if(s->progressive_sequence){ if(s->repeat_first_field){ nofco++; if(s->top_field_first) nofco++; } }else{ if(s->picture_structure == PICT_FRAME){ nofco++; if(s->repeat_first_field) nofco++; } } for(i=0; i<nofco; i++){ s1->pan_scan.position[i][0]= get_sbits(&s->gb, 16); skip_bits(&s->gb, 1); //marker s1->pan_scan.position[i][1]= get_sbits(&s->gb, 16); skip_bits(&s->gb, 1); //marker } if(s->avctx->debug & FF_DEBUG_PICT_INFO) av_log(s->avctx, AV_LOG_DEBUG, "pde (%d,%d) (%d,%d) (%d,%d)n", s1->pan_scan.position[0][0], s1->pan_scan.position[0][1], s1->pan_scan.position[1][0], s1->pan_scan.position[1][1], s1->pan_scan.position[2][0], s1->pan_scan.position[2][1] ); } static void mpeg_decode_quant_matrix_extension(MpegEncContext *s) { int i, v, j; dprintf("matrix extensionn"); if (get_bits1(&s->gb)) { for(i=0;i<64;i++) { v = get_bits(&s->gb, 8); j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ]; s->intra_matrix[j] = v; s->chroma_intra_matrix[j] = v; } } if (get_bits1(&s->gb)) { for(i=0;i<64;i++) { v = get_bits(&s->gb, 8); j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ]; s->inter_matrix[j] = v; s->chroma_inter_matrix[j] = v; } } if (get_bits1(&s->gb)) { for(i=0;i<64;i++) { v = get_bits(&s->gb, 8); j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ]; s->chroma_intra_matrix[j] = v; } } if (get_bits1(&s->gb)) { for(i=0;i<64;i++) { v = get_bits(&s->gb, 8); j= s->dsp.idct_permutation[ ff_zigzag_direct[i] ]; s->chroma_inter_matrix[j] = v; } } } static void mpeg_decode_picture_coding_extension(MpegEncContext *s) { s->full_pel[0] = s->full_pel[1] = 0; s->mpeg_f_code[0][0] = get_bits(&s->gb, 4); s->mpeg_f_code[0][1] = get_bits(&s->gb, 4); s->mpeg_f_code[1][0] = get_bits(&s->gb, 4); s->mpeg_f_code[1][1] = get_bits(&s->gb, 4); s->intra_dc_precision = get_bits(&s->gb, 2); s->picture_structure = get_bits(&s->gb, 2); s->top_field_first = get_bits1(&s->gb); s->frame_pred_frame_dct = get_bits1(&s->gb); s->concealment_motion_vectors = get_bits1(&s->gb); s->q_scale_type = get_bits1(&s->gb); s->intra_vlc_format = get_bits1(&s->gb); s->alternate_scan = get_bits1(&s->gb); s->repeat_first_field = get_bits1(&s->gb); s->chroma_420_type = get_bits1(&s->gb); s->progressive_frame = get_bits1(&s->gb); if(s->picture_structure == PICT_FRAME) s->first_field=0; else{ s->first_field ^= 1; memset(s->mbskip_table, 0, s->mb_stride*s->mb_height); } if(s->alternate_scan){ ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_alternate_vertical_scan); ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_alternate_vertical_scan); }else{ ff_init_scantable(s->dsp.idct_permutation, &s->inter_scantable , ff_zigzag_direct); ff_init_scantable(s->dsp.idct_permutation, &s->intra_scantable , ff_zigzag_direct); } /* composite display not parsed */ dprintf("intra_dc_precision=%dn", s->intra_dc_precision); dprintf("picture_structure=%dn", s->picture_structure); dprintf("top field first=%dn", s->top_field_first); dprintf("repeat first field=%dn", s->repeat_first_field); dprintf("conceal=%dn", s->concealment_motion_vectors); dprintf("intra_vlc_format=%dn", s->intra_vlc_format); dprintf("alternate_scan=%dn", s->alternate_scan); dprintf("frame_pred_frame_dct=%dn", s->frame_pred_frame_dct); dprintf("progressive_frame=%dn", s->progressive_frame); } static void mpeg_decode_extension(AVCodecContext *avctx, const uint8_t *buf, int buf_size) { Mpeg1Context *s1 = avctx->priv_data; MpegEncContext *s = &s1->mpeg_enc_ctx; int ext_type; init_get_bits(&s->gb, buf, buf_size*8); ext_type = get_bits(&s->gb, 4); switch(ext_type) { case 0x1: mpeg_decode_sequence_extension(s1); break; case 0x2: mpeg_decode_sequence_display_extension(s1); break; case 0x3: mpeg_decode_quant_matrix_extension(s); break; case 0x7: mpeg_decode_picture_display_extension(s1); break; case 0x8: mpeg_decode_picture_coding_extension(s); break; } } static void exchange_uv(MpegEncContext *s){ short * tmp = s->pblocks[4]; s->pblocks[4] = s->pblocks[5]; s->pblocks[5] = tmp; } static int mpeg_field_start(MpegEncContext *s){ AVCodecContext *avctx= s->avctx; Mpeg1Context *s1 = (Mpeg1Context*)s; /* start frame decoding */ if(s->first_field || s->picture_structure==PICT_FRAME){ if(MPV_frame_start(s, avctx) < 0) return -1; ff_er_frame_start(s); /* first check if we must repeat the frame */ s->current_picture_ptr->repeat_pict = 0; if (s->repeat_first_field) { if (s->progressive_sequence) { if (s->top_field_first) s->current_picture_ptr->repeat_pict = 4; else s->current_picture_ptr->repeat_pict = 2; } else if (s->progressive_frame) { s->current_picture_ptr->repeat_pict = 1; } } *s->current_picture_ptr->pan_scan= s1->pan_scan; }else{ //second field int i; if(!s->current_picture_ptr){ av_log(s->avctx, AV_LOG_ERROR, "first field missingn"); return -1; } for(i=0; i<4; i++){ s->current_picture.data[i] = s->current_picture_ptr->data[i]; if(s->picture_structure == PICT_BOTTOM_FIELD){ s->current_picture.data[i] += s->current_picture_ptr->linesize[i]; } } } #ifdef HAVE_XVMC // MPV_frame_start will call this function too, // but we need to call it on every field if(s->avctx->xvmc_acceleration) XVMC_field_start(s,avctx); #endif return 0; } #define DECODE_SLICE_ERROR -1 #define DECODE_SLICE_OK 0 /** * decodes a slice. MpegEncContext.mb_y must be set to the MB row from the startcode * @return DECODE_SLICE_ERROR if the slice is damaged<br> * DECODE_SLICE_OK if this slice is ok<br> */ static int mpeg_decode_slice(Mpeg1Context *s1, int mb_y, const uint8_t **buf, int buf_size) { MpegEncContext *s = &s1->mpeg_enc_ctx; AVCodecContext *avctx= s->avctx; int ret; const int field_pic= s->picture_structure != PICT_FRAME; const int lowres= s->avctx->lowres; s->resync_mb_x= s->resync_mb_y= -1; if (mb_y<<field_pic >= s->mb_height){ av_log(s->avctx, AV_LOG_ERROR, "slice below image (%d >= %d)n", mb_y, s->mb_height); return -1; } init_get_bits(&s->gb, *buf, buf_size*8); ff_mpeg1_clean_buffers(s); s->interlaced_dct = 0; s->qscale = get_qscale(s); if(s->qscale == 0){ av_log(s->avctx, AV_LOG_ERROR, "qscale == 0n"); return -1; } /* extra slice info */ while (get_bits1(&s->gb) != 0) { skip_bits(&s->gb, 8); } s->mb_x=0; for(;;) { int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2); if (code < 0){ av_log(s->avctx, AV_LOG_ERROR, "first mb_incr damagedn"); return -1; } if (code >= 33) { if (code == 33) { s->mb_x += 33; } /* otherwise, stuffing, nothing to do */ } else { s->mb_x += code; break; } } s->resync_mb_x= s->mb_x; s->resync_mb_y= s->mb_y= mb_y; s->mb_skip_run= 0; ff_init_block_index(s); if (s->mb_y==0 && s->mb_x==0 && (s->first_field || s->picture_structure==PICT_FRAME)) { if(s->avctx->debug&FF_DEBUG_PICT_INFO){ av_log(s->avctx, AV_LOG_DEBUG, "qp:%d fc:%2d%2d%2d%2d %s %s %s %s %s dc:%d pstruct:%d fdct:%d cmv:%d qtype:%d ivlc:%d rff:%d %sn", s->qscale, s->mpeg_f_code[0][0],s->mpeg_f_code[0][1],s->mpeg_f_code[1][0],s->mpeg_f_code[1][1], s->pict_type == I_TYPE ? "I" : (s->pict_type == P_TYPE ? "P" : (s->pict_type == B_TYPE ? "B" : "S")), s->progressive_sequence ? "ps" :"", s->progressive_frame ? "pf" : "", s->alternate_scan ? "alt" :"", s->top_field_first ? "top" :"", s->intra_dc_precision, s->picture_structure, s->frame_pred_frame_dct, s->concealment_motion_vectors, s->q_scale_type, s->intra_vlc_format, s->repeat_first_field, s->chroma_420_type ? "420" :""); } } for(;;) { #ifdef HAVE_XVMC //one 1 we memcpy blocks in xvmcvideo if(s->avctx->xvmc_acceleration > 1) XVMC_init_block(s);//set s->block #endif ret = mpeg_decode_mb(s, s->block); s->chroma_qscale= s->qscale; dprintf("ret=%dn", ret); if (ret < 0) return -1; if(s->current_picture.motion_val[0] && !s->encoding){ //note motion_val is normally NULL unless we want to extract the MVs const int wrap = field_pic ? 2*s->b8_stride : s->b8_stride; int xy = s->mb_x*2 + s->mb_y*2*wrap; int motion_x, motion_y, dir, i; if(field_pic && !s->first_field) xy += wrap/2; for(i=0; i<2; i++){ for(dir=0; dir<2; dir++){ if (s->mb_intra || (dir==1 && s->pict_type != B_TYPE)) { motion_x = motion_y = 0; }else if (s->mv_type == MV_TYPE_16X16 || (s->mv_type == MV_TYPE_FIELD && field_pic)){ motion_x = s->mv[dir][0][0]; motion_y = s->mv[dir][0][1]; } else /*if ((s->mv_type == MV_TYPE_FIELD) || (s->mv_type == MV_TYPE_16X8))*/ { motion_x = s->mv[dir][i][0]; motion_y = s->mv[dir][i][1]; } s->current_picture.motion_val[dir][xy ][0] = motion_x; s->current_picture.motion_val[dir][xy ][1] = motion_y; s->current_picture.motion_val[dir][xy + 1][0] = motion_x; s->current_picture.motion_val[dir][xy + 1][1] = motion_y; s->current_picture.ref_index [dir][xy ]= s->current_picture.ref_index [dir][xy + 1]= s->field_select[dir][i]; assert(s->field_select[dir][i]==0 || s->field_select[dir][i]==1); } xy += wrap; } } s->dest[0] += 16 >> lowres; s->dest[1] += 16 >> (s->chroma_x_shift + lowres); s->dest[2] += 16 >> (s->chroma_x_shift + lowres); MPV_decode_mb(s, s->block); if (++s->mb_x >= s->mb_width) { const int mb_size= 16>>s->avctx->lowres; ff_draw_horiz_band(s, mb_size*s->mb_y, mb_size); s->mb_x = 0; s->mb_y++; if(s->mb_y<<field_pic >= s->mb_height){ int left= s->gb.size_in_bits - get_bits_count(&s->gb); if(left < 0 || (left && show_bits(&s->gb, FFMIN(left, 23))) || (avctx->error_resilience >= FF_ER_AGGRESSIVE && left>8)){ av_log(avctx, AV_LOG_ERROR, "end mismatch left=%dn", left); return -1; }else goto eos; } ff_init_block_index(s); } /* skip mb handling */ if (s->mb_skip_run == -1) { /* read again increment */ s->mb_skip_run = 0; for(;;) { int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2); if (code < 0){ av_log(s->avctx, AV_LOG_ERROR, "mb incr damagedn"); return -1; } if (code >= 33) { if (code == 33) { s->mb_skip_run += 33; }else if(code == 35){ if(s->mb_skip_run != 0 || show_bits(&s->gb, 15) != 0){ av_log(s->avctx, AV_LOG_ERROR, "slice mismatchn"); return -1; } goto eos; /* end of slice */ } /* otherwise, stuffing, nothing to do */ } else { s->mb_skip_run += code; break; } } } } eos: // end of slice *buf += get_bits_count(&s->gb)/8 - 1; //printf("y %d %d %d %dn", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y); return 0; } static int slice_decode_thread(AVCodecContext *c, void *arg){ MpegEncContext *s= arg; const uint8_t *buf= s->gb.buffer; int mb_y= s->start_mb_y; s->error_count= 3*(s->end_mb_y - s->start_mb_y)*s->mb_width; for(;;){ int start_code, ret; ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf); emms_c(); //av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%dn", //ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, s->start_mb_y, s->end_mb_y, s->error_count); if(ret < 0){ if(s->resync_mb_x>=0 && s->resync_mb_y>=0) ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, AC_ERROR|DC_ERROR|MV_ERROR); }else{ ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END); } if(s->mb_y == s->end_mb_y) return 0; start_code = find_start_code(&buf, s->gb.buffer_end); mb_y= start_code - SLICE_MIN_START_CODE; if(mb_y < 0 || mb_y >= s->end_mb_y) return -1; } return 0; //not reached } /** * handles slice ends. * @return 1 if it seems to be the last slice of */ static int slice_end(AVCodecContext *avctx, AVFrame *pict) { Mpeg1Context *s1 = avctx->priv_data; MpegEncContext *s = &s1->mpeg_enc_ctx; if (!s1->mpeg_enc_ctx_allocated || !s->current_picture_ptr) return 0; #ifdef HAVE_XVMC if(s->avctx->xvmc_acceleration) XVMC_field_end(s); #endif /* end of slice reached */ if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) { /* end of image */ s->current_picture_ptr->qscale_type= FF_QSCALE_TYPE_MPEG2; ff_er_frame_end(s); MPV_frame_end(s); if (s->pict_type == B_TYPE || s->low_delay) { *pict= *(AVFrame*)s->current_picture_ptr; ff_print_debug_info(s, pict); } else { s->picture_number++; /* latency of 1 frame for I and P frames */ /* XXX: use another variable than picture_number */ if (s->last_picture_ptr != NULL) { *pict= *(AVFrame*)s->last_picture_ptr; ff_print_debug_info(s, pict); } } return 1; } else { return 0; } } static int mpeg1_decode_sequence(AVCodecContext *avctx, const uint8_t *buf, int buf_size) { Mpeg1Context *s1 = avctx->priv_data; MpegEncContext *s = &s1->mpeg_enc_ctx; int width,height; int i, v, j; init_get_bits(&s->gb, buf, buf_size*8); width = get_bits(&s->gb, 12); height = get_bits(&s->gb, 12); if (width <= 0 || height <= 0 || (width % 2) != 0 || (height % 2) != 0) return -1; s->aspect_ratio_info= get_bits(&s->gb, 4); if (s->aspect_ratio_info == 0) return -1; s->frame_rate_index = get_bits(&s->gb, 4); if (s->frame_rate_index == 0 || s->frame_rate_index > 13) return -1; s->bit_rate = get_bits(&s->gb, 18) * 400; if (get_bits1(&s->gb) == 0) /* marker */ return -1; s->width = width; s->height = height; s->avctx->rc_buffer_size= get_bits(&s->gb, 10) * 1024*16; skip_bits(&s->gb, 1); /* get matrix */ if (get_bits1(&s->gb)) { for(i=0;i<64;i++) { v = get_bits(&s->gb, 8); if(v==0){ av_log(s->avctx, AV_LOG_ERROR, "intra matrix damagedn"); return -1; } j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ]; s->intra_matrix[j] = v; s->chroma_intra_matrix[j] = v; } #ifdef DEBUG dprintf("intra matrix presentn"); for(i=0;i<64;i++) dprintf(" %d", s->intra_matrix[s->dsp.idct_permutation[i]]); printf("n"); #endif } else { for(i=0;i<64;i++) { j = s->dsp.idct_permutation[i]; v = ff_mpeg1_default_intra_matrix[i]; s->intra_matrix[j] = v; s->chroma_intra_matrix[j] = v; } } if (get_bits1(&s->gb)) { for(i=0;i<64;i++) { v = get_bits(&s->gb, 8); if(v==0){ av_log(s->avctx, AV_LOG_ERROR, "inter matrix damagedn"); return -1; } j = s->dsp.idct_permutation[ ff_zigzag_direct[i] ]; s->inter_matrix[j] = v; s->chroma_inter_matrix[j] = v; } #ifdef DEBUG dprintf("non intra matrix presentn"); for(i=0;i<64;i++) dprintf(" %d", s->inter_matrix[s->dsp.idct_permutation[i]]); printf("n"); #endif } else { for(i=0;i<64;i++) { int j= s->dsp.idct_permutation[i]; v = ff_mpeg1_default_non_intra_matrix[i]; s->inter_matrix[j] = v; s->chroma_inter_matrix[j] = v; } } if(show_bits(&s->gb, 23) != 0){ av_log(s->avctx, AV_LOG_ERROR, "sequence header damagedn"); return -1; } /* we set mpeg2 parameters so that it emulates mpeg1 */ s->progressive_sequence = 1; s->progressive_frame = 1; s->picture_structure = PICT_FRAME; s->frame_pred_frame_dct = 1; s->chroma_format = 1; s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG1VIDEO; avctx->sub_id = 1; /* indicates mpeg1 */ s->out_format = FMT_MPEG1; s->swap_uv = 0;//AFAIK VCR2 don't have SEQ_HEADER if(s->flags & CODEC_FLAG_LOW_DELAY) s->low_delay=1; if(s->avctx->debug & FF_DEBUG_PICT_INFO) av_log(s->avctx, AV_LOG_DEBUG, "vbv buffer: %d, bitrate:%dn", s->avctx->rc_buffer_size, s->bit_rate); return 0; } static int vcr2_init_sequence(AVCodecContext *avctx) { Mpeg1Context *s1 = avctx->priv_data; MpegEncContext *s = &s1->mpeg_enc_ctx; int i, v; /* start new mpeg1 context decoding */ s->out_format = FMT_MPEG1; if (s1->mpeg_enc_ctx_allocated) { MPV_common_end(s); } s->width = avctx->coded_width; s->height = avctx->coded_height; avctx->has_b_frames= 0; //true? s->low_delay= 1; if(avctx->xvmc_acceleration){ avctx->pix_fmt = avctx->get_format(avctx,pixfmt_xvmc_mpg2_420); }else{ avctx->pix_fmt = avctx->get_format(avctx,pixfmt_yuv_420); } if( avctx->pix_fmt == PIX_FMT_XVMC_MPEG2_IDCT ) if( avctx->idct_algo == FF_IDCT_AUTO ) avctx->idct_algo = FF_IDCT_SIMPLE; if (MPV_common_init(s) < 0) return -1; exchange_uv(s);//common init reset pblocks, so we swap them here s->swap_uv = 1;// in case of xvmc we need to swap uv for each MB s1->mpeg_enc_ctx_allocated = 1; for(i=0;i<64;i++) { int j= s->dsp.idct_permutation[i]; v = ff_mpeg1_default_intra_matrix[i]; s->intra_matrix[j] = v; s->chroma_intra_matrix[j] = v; v = ff_mpeg1_default_non_intra_matrix[i]; s->inter_matrix[j] = v; s->chroma_inter_matrix[j] = v; } s->progressive_sequence = 1; s->progressive_frame = 1; s->picture_structure = PICT_FRAME; s->frame_pred_frame_dct = 1; s->chroma_format = 1; s->codec_id= s->avctx->codec_id= CODEC_ID_MPEG2VIDEO; avctx->sub_id = 2; /* indicates mpeg2 */ return 0; } static void mpeg_decode_user_data(AVCodecContext *avctx, const uint8_t *buf, int buf_size) { const uint8_t *p; int len, flags; p = buf; len = buf_size; /* we parse the DTG active format information */ if (len >= 5 && p[0] == 'D' && p[1] == 'T' && p[2] == 'G' && p[3] == '1') { flags = p[4]; p += 5; len -= 5; if (flags & 0x80) { /* skip event id */ if (len < 2) return; p += 2; len -= 2; } if (flags & 0x40) { if (len < 1) return; avctx->dtg_active_format = p[0] & 0x0f; } } } static void mpeg_decode_gop(AVCodecContext *avctx, const uint8_t *buf, int buf_size){ Mpeg1Context *s1 = avctx->priv_data; MpegEncContext *s = &s1->mpeg_enc_ctx; int drop_frame_flag; int time_code_hours, time_code_minutes; int time_code_seconds, time_code_pictures; int broken_link; init_get_bits(&s->gb, buf, buf_size*8); drop_frame_flag = get_bits1(&s->gb); time_code_hours=get_bits(&s->gb,5); time_code_minutes = get_bits(&s->gb,6); skip_bits1(&s->gb);//marker bit time_code_seconds = get_bits(&s->gb,6); time_code_pictures = get_bits(&s->gb,6); /*broken_link indicate that after editing the reference frames of the first B-Frames after GOP I-Frame are missing (open gop)*/ broken_link = get_bits1(&s->gb); if(s->avctx->debug & FF_DEBUG_PICT_INFO) av_log(s->avctx, AV_LOG_DEBUG, "GOP (%2d:%02d:%02d.[%02d]) broken_link=%dn", time_code_hours, time_code_minutes, time_code_seconds, time_code_pictures, broken_link); } /** * finds the end of the current frame in the bitstream. * @return the position of the first byte of the next frame, or -1 */ int ff_mpeg1_find_frame_end(ParseContext *pc, const uint8_t *buf, int buf_size) { int i; uint32_t state; state= pc->state; i=0; if(!pc->frame_start_found){ for(i=0; i<buf_size; i++){ state= (state<<8) | buf[i]; if(state >= SLICE_MIN_START_CODE && state <= SLICE_MAX_START_CODE){ i++; pc->frame_start_found=1; break; } } } if(pc->frame_start_found){ /* EOF considered as end of frame */ if (buf_size == 0) return 0; for(; i<buf_size; i++){ state= (state<<8) | buf[i]; if((state&0xFFFFFF00) == 0x100){ if(state < SLICE_MIN_START_CODE || state > SLICE_MAX_START_CODE){ pc->frame_start_found=0; pc->state=-1; return i-3; } } } } pc->state= state; return END_NOT_FOUND; } /* handle buffering and image synchronisation */ static int mpeg_decode_frame(AVCodecContext *avctx, void *data, int *data_size, uint8_t *buf, int buf_size) { Mpeg1Context *s = avctx->priv_data; const uint8_t *buf_end; const uint8_t *buf_ptr; int ret, start_code, input_size; AVFrame *picture = data; MpegEncContext *s2 = &s->mpeg_enc_ctx; dprintf("fill_buffern"); if (buf_size == 0) { /* special case for last picture */ if (s2->low_delay==0 && s2->next_picture_ptr) { *picture= *(AVFrame*)s2->next_picture_ptr; s2->next_picture_ptr= NULL; *data_size = sizeof(AVFrame); } return 0; } if(s2->flags&CODEC_FLAG_TRUNCATED){ int next= ff_mpeg1_find_frame_end(&s2->parse_context, buf, buf_size); if( ff_combine_frame(&s2->parse_context, next, &buf, &buf_size) < 0 ) return buf_size; } buf_ptr = buf; buf_end = buf + buf_size; #if 0 if (s->repeat_field % 2 == 1) { s->repeat_field++; //fprintf(stderr,"nRepeating last frame: %d -> %d! pict: %d %d", avctx->frame_number-1, avctx->frame_number, // s2->picture_number, s->repeat_field); if (avctx->flags & CODEC_FLAG_REPEAT_FIELD) { *data_size = sizeof(AVPicture); goto the_end; } } #endif if(s->mpeg_enc_ctx_allocated==0 && avctx->codec_tag == ff_get_fourcc("VCR2")) vcr2_init_sequence(avctx); s->slice_count= 0; for(;;) { /* find start next code */ start_code = find_start_code(&buf_ptr, buf_end); if (start_code < 0){ if(s2->pict_type != B_TYPE || avctx->skip_frame <= AVDISCARD_DEFAULT){ if(avctx->thread_count > 1){ int i; avctx->execute(avctx, slice_decode_thread, (void**)&(s2->thread_context[0]), NULL, s->slice_count); for(i=0; i<s->slice_count; i++) s2->error_count += s2->thread_context[i]->error_count; } if (slice_end(avctx, picture)) { if(s2->last_picture_ptr || s2->low_delay) //FIXME merge with the stuff in mpeg_decode_slice *data_size = sizeof(AVPicture); } } return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index); } input_size = buf_end - buf_ptr; if(avctx->debug & FF_DEBUG_STARTCODE){ av_log(avctx, AV_LOG_DEBUG, "%3X at %zd left %dn", start_code, buf_ptr-buf, input_size); } /* prepare data for next start code */ switch(start_code) { case SEQ_START_CODE: mpeg1_decode_sequence(avctx, buf_ptr, input_size); break; case PICTURE_START_CODE: /* we have a complete image : we try to decompress it */ mpeg1_decode_picture(avctx, buf_ptr, input_size); break; case EXT_START_CODE: mpeg_decode_extension(avctx, buf_ptr, input_size); break; case USER_START_CODE: mpeg_decode_user_data(avctx, buf_ptr, input_size); break; case GOP_START_CODE: s2->first_field=0; mpeg_decode_gop(avctx, buf_ptr, input_size); break; default: if (start_code >= SLICE_MIN_START_CODE && start_code <= SLICE_MAX_START_CODE) { int mb_y= start_code - SLICE_MIN_START_CODE; if(s2->last_picture_ptr==NULL){ /* skip b frames if we dont have reference frames */ if(s2->pict_type==B_TYPE) break; /* skip P frames if we dont have reference frame no valid header */ if(s2->pict_type==P_TYPE && !s2->first_slice) break;
- } /* skip b frames if we are in a hurry */ if(avctx->hurry_up && s2->pict_type==B_TYPE) break; if( (avctx->skip_frame >= AVDISCARD_NONREF && s2->pict_type==B_TYPE) ||(avctx->skip_frame >= AVDISCARD_NONKEY && s2->pict_type!=I_TYPE) || avctx->skip_frame >= AVDISCARD_ALL) break; /* skip everything if we are in a hurry>=5 */ if(avctx->hurry_up>=5) break; if (!s->mpeg_enc_ctx_allocated) break; if(s2->codec_id == CODEC_ID_MPEG2VIDEO){ if(mb_y < avctx->skip_top || mb_y >= s2->mb_height - avctx->skip_bottom) break; } if(s2->first_slice){ s2->first_slice=0; if(mpeg_field_start(s2) < 0) return -1; } if(avctx->thread_count > 1){ int threshold= (s2->mb_height*s->slice_count + avctx->thread_count/2) / avctx->thread_count; if(threshold <= mb_y){ MpegEncContext *thread_context= s2->thread_context[s->slice_count]; thread_context->start_mb_y= mb_y; thread_context->end_mb_y = s2->mb_height; if(s->slice_count){ s2->thread_context[s->slice_count-1]->end_mb_y= mb_y; ff_update_duplicate_context(thread_context, s2); } init_get_bits(&thread_context->gb, buf_ptr, input_size*8); s->slice_count++; } buf_ptr += 2; //FIXME add minimum num of bytes per slice }else{ ret = mpeg_decode_slice(s, mb_y, &buf_ptr, input_size); emms_c(); if(ret < 0){ if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0) ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x, s2->mb_y, AC_ERROR|DC_ERROR|MV_ERROR); }else{ ff_er_add_slice(s2, s2->resync_mb_x, s2->resync_mb_y, s2->mb_x-1, s2->mb_y, AC_END|DC_END|MV_END); } } } break; } } } static int mpeg_decode_end(AVCodecContext *avctx) { Mpeg1Context *s = avctx->priv_data; if (s->mpeg_enc_ctx_allocated) MPV_common_end(&s->mpeg_enc_ctx); return 0; } AVCodec mpeg1video_decoder = { "mpeg1video", CODEC_TYPE_VIDEO, CODEC_ID_MPEG1VIDEO, sizeof(Mpeg1Context), mpeg_decode_init, NULL, mpeg_decode_end, mpeg_decode_frame, CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY, NULL, //next
- ff_mpeg_flush,
- }; AVCodec mpeg2video_decoder = { "mpeg2video", CODEC_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO, sizeof(Mpeg1Context), mpeg_decode_init, NULL, mpeg_decode_end, mpeg_decode_frame, CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY, NULL, //next
- ff_mpeg_flush,
- }; //legacy decoder AVCodec mpegvideo_decoder = { "mpegvideo", CODEC_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO, sizeof(Mpeg1Context), mpeg_decode_init, NULL, mpeg_decode_end, mpeg_decode_frame, CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY, NULL, //next
- ff_mpeg_flush,
- }; #ifdef CONFIG_ENCODERS AVCodec mpeg1video_encoder = { "mpeg1video", CODEC_TYPE_VIDEO, CODEC_ID_MPEG1VIDEO, sizeof(MpegEncContext), encode_init, MPV_encode_picture, MPV_encode_end, .supported_framerates= frame_rate_tab+1, .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1}, .capabilities= CODEC_CAP_DELAY, }; AVCodec mpeg2video_encoder = { "mpeg2video", CODEC_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO, sizeof(MpegEncContext), encode_init, MPV_encode_picture, MPV_encode_end, .supported_framerates= frame_rate_tab+1, .pix_fmts= (enum PixelFormat[]){PIX_FMT_YUV420P, -1}, .capabilities= CODEC_CAP_DELAY, }; #endif #ifdef HAVE_XVMC static int mpeg_mc_decode_init(AVCodecContext *avctx){ Mpeg1Context *s; if( avctx->thread_count > 1) return -1; if( !(avctx->slice_flags & SLICE_FLAG_CODED_ORDER) ) return -1; if( !(avctx->slice_flags & SLICE_FLAG_ALLOW_FIELD) ){ dprintf("mpeg12.c: XvMC decoder will work better if SLICE_FLAG_ALLOW_FIELD is setn"); } mpeg_decode_init(avctx); s = avctx->priv_data; avctx->pix_fmt = PIX_FMT_XVMC_MPEG2_IDCT; avctx->xvmc_acceleration = 2;//2 - the blocks are packed! return 0; } AVCodec mpeg_xvmc_decoder = { "mpegvideo_xvmc", CODEC_TYPE_VIDEO, CODEC_ID_MPEG2VIDEO_XVMC, sizeof(Mpeg1Context), mpeg_mc_decode_init, NULL, mpeg_decode_end, mpeg_decode_frame, CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 | CODEC_CAP_TRUNCATED| CODEC_CAP_HWACCEL | CODEC_CAP_DELAY, .flush= ff_mpeg_flush, }; #endif /* this is ugly i know, but the alternative is too make hundreds of vars global and prefix them with ff_mpeg1_ which is far uglier. */ #include "mdec.c"
