dv.c
资源名称:tcpmp.rar [点击查看]
上传用户:wstnjxml
上传日期:2014-04-03
资源大小:7248k
文件大小:31k
源码类别:
Windows CE
开发平台:
C/C++
- /*
- * DV decoder
- * Copyright (c) 2002 Fabrice Bellard.
- * Copyright (c) 2004 Roman Shaposhnik.
- *
- * DV encoder
- * Copyright (c) 2003 Roman Shaposhnik.
- *
- * Many thanks to Dan Dennedy <dan@dennedy.org> for providing wealth
- * of DV technical info.
- *
- * 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 dv.c
- * DV codec.
- */
- #include "avcodec.h"
- #include "dsputil.h"
- #include "mpegvideo.h"
- #include "simple_idct.h"
- #include "dvdata.h"
- //#undef NDEBUG
- //#include <assert.h>
- typedef struct DVVideoContext {
- const DVprofile* sys;
- AVFrame picture;
- AVCodecContext *avctx;
- uint8_t *buf;
- uint8_t dv_zigzag[2][64];
- uint8_t dv_idct_shift[2][2][22][64];
- void (*get_pixels)(DCTELEM *block, const uint8_t *pixels, int line_size);
- void (*fdct[2])(DCTELEM *block);
- void (*idct_put[2])(uint8_t *dest, int line_size, DCTELEM *block);
- } DVVideoContext;
- #define TEX_VLC_BITS 9
- #ifdef DV_CODEC_TINY_TARGET
- #define DV_VLC_MAP_RUN_SIZE 15
- #define DV_VLC_MAP_LEV_SIZE 23
- #else
- #define DV_VLC_MAP_RUN_SIZE 64
- #define DV_VLC_MAP_LEV_SIZE 512 //FIXME sign was removed so this should be /2 but needs check
- #endif
- /* MultiThreading */
- static uint8_t** dv_anchor;
- /* XXX: also include quantization */
- static RL_VLC_ELEM *dv_rl_vlc;
- /* VLC encoding lookup table */
- static struct dv_vlc_pair {
- uint32_t vlc;
- uint8_t size;
- } (*dv_vlc_map)[DV_VLC_MAP_LEV_SIZE] = NULL;
- static void dv_build_unquantize_tables(DVVideoContext *s, uint8_t* perm)
- {
- int i, q, j;
- /* NOTE: max left shift is 6 */
- for(q = 0; q < 22; q++) {
- /* 88DCT */
- for(i = 1; i < 64; i++) {
- /* 88 table */
- j = perm[i];
- s->dv_idct_shift[0][0][q][j] =
- dv_quant_shifts[q][dv_88_areas[i]] + 1;
- s->dv_idct_shift[1][0][q][j] = s->dv_idct_shift[0][0][q][j] + 1;
- }
- /* 248DCT */
- for(i = 1; i < 64; i++) {
- /* 248 table */
- s->dv_idct_shift[0][1][q][i] =
- dv_quant_shifts[q][dv_248_areas[i]] + 1;
- s->dv_idct_shift[1][1][q][i] = s->dv_idct_shift[0][1][q][i] + 1;
- }
- }
- }
- static int dvvideo_init(AVCodecContext *avctx)
- {
- DVVideoContext *s = avctx->priv_data;
- DSPContext dsp;
- static int done=0;
- int i, j;
- if (!done) {
- VLC dv_vlc;
- uint16_t new_dv_vlc_bits[NB_DV_VLC*2];
- uint8_t new_dv_vlc_len[NB_DV_VLC*2];
- uint8_t new_dv_vlc_run[NB_DV_VLC*2];
- int16_t new_dv_vlc_level[NB_DV_VLC*2];
- done = 1;
- dv_vlc_map = av_mallocz_static(DV_VLC_MAP_LEV_SIZE*DV_VLC_MAP_RUN_SIZE*sizeof(struct dv_vlc_pair));
- if (!dv_vlc_map)
- return -ENOMEM;
- /* dv_anchor lets each thread know its Id */
- dv_anchor = av_malloc(12*27*sizeof(void*));
- if (!dv_anchor) {
- return -ENOMEM;
- }
- for (i=0; i<12*27; i++)
- dv_anchor[i] = (void*)(size_t)i;
- /* it's faster to include sign bit in a generic VLC parsing scheme */
- for (i=0, j=0; i<NB_DV_VLC; i++, j++) {
- new_dv_vlc_bits[j] = dv_vlc_bits[i];
- new_dv_vlc_len[j] = dv_vlc_len[i];
- new_dv_vlc_run[j] = dv_vlc_run[i];
- new_dv_vlc_level[j] = dv_vlc_level[i];
- if (dv_vlc_level[i]) {
- new_dv_vlc_bits[j] <<= 1;
- new_dv_vlc_len[j]++;
- j++;
- new_dv_vlc_bits[j] = (dv_vlc_bits[i] << 1) | 1;
- new_dv_vlc_len[j] = dv_vlc_len[i] + 1;
- new_dv_vlc_run[j] = dv_vlc_run[i];
- new_dv_vlc_level[j] = -dv_vlc_level[i];
- }
- }
- /* NOTE: as a trick, we use the fact the no codes are unused
- to accelerate the parsing of partial codes */
- init_vlc(&dv_vlc, TEX_VLC_BITS, j,
- new_dv_vlc_len, 1, 1, new_dv_vlc_bits, 2, 2, 0);
- dv_rl_vlc = av_malloc(dv_vlc.table_size * sizeof(RL_VLC_ELEM));
- if (!dv_rl_vlc) {
- av_free(dv_anchor);
- return -ENOMEM;
- }
- for(i = 0; i < dv_vlc.table_size; i++){
- int code= dv_vlc.table[i][0];
- int len = dv_vlc.table[i][1];
- int level, run;
- if(len<0){ //more bits needed
- run= 0;
- level= code;
- } else {
- run= new_dv_vlc_run[code] + 1;
- level= new_dv_vlc_level[code];
- }
- dv_rl_vlc[i].len = len;
- dv_rl_vlc[i].level = level;
- dv_rl_vlc[i].run = run;
- }
- free_vlc(&dv_vlc);
- for (i = 0; i < NB_DV_VLC - 1; i++) {
- if (dv_vlc_run[i] >= DV_VLC_MAP_RUN_SIZE)
- continue;
- #ifdef DV_CODEC_TINY_TARGET
- if (dv_vlc_level[i] >= DV_VLC_MAP_LEV_SIZE)
- continue;
- #endif
- if (dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].size != 0)
- continue;
- dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].vlc = dv_vlc_bits[i] <<
- (!!dv_vlc_level[i]);
- dv_vlc_map[dv_vlc_run[i]][dv_vlc_level[i]].size = dv_vlc_len[i] +
- (!!dv_vlc_level[i]);
- }
- for (i = 0; i < DV_VLC_MAP_RUN_SIZE; i++) {
- #ifdef DV_CODEC_TINY_TARGET
- for (j = 1; j < DV_VLC_MAP_LEV_SIZE; j++) {
- if (dv_vlc_map[i][j].size == 0) {
- dv_vlc_map[i][j].vlc = dv_vlc_map[0][j].vlc |
- (dv_vlc_map[i-1][0].vlc << (dv_vlc_map[0][j].size));
- dv_vlc_map[i][j].size = dv_vlc_map[i-1][0].size +
- dv_vlc_map[0][j].size;
- }
- }
- #else
- for (j = 1; j < DV_VLC_MAP_LEV_SIZE/2; j++) {
- if (dv_vlc_map[i][j].size == 0) {
- dv_vlc_map[i][j].vlc = dv_vlc_map[0][j].vlc |
- (dv_vlc_map[i-1][0].vlc << (dv_vlc_map[0][j].size));
- dv_vlc_map[i][j].size = dv_vlc_map[i-1][0].size +
- dv_vlc_map[0][j].size;
- }
- dv_vlc_map[i][((uint16_t)(-j))&0x1ff].vlc =
- dv_vlc_map[i][j].vlc | 1;
- dv_vlc_map[i][((uint16_t)(-j))&0x1ff].size =
- dv_vlc_map[i][j].size;
- }
- #endif
- }
- }
- /* Generic DSP setup */
- dsputil_init(&dsp, avctx);
- s->get_pixels = dsp.get_pixels;
- /* 88DCT setup */
- s->fdct[0] = dsp.fdct;
- s->idct_put[0] = dsp.idct_put;
- for (i=0; i<64; i++)
- s->dv_zigzag[0][i] = dsp.idct_permutation[ff_zigzag_direct[i]];
- /* 248DCT setup */
- s->fdct[1] = dsp.fdct248;
- s->idct_put[1] = simple_idct248_put; // FIXME: need to add it to DSP
- if(avctx->lowres){
- for (i=0; i<64; i++){
- int j= ff_zigzag248_direct[i];
- s->dv_zigzag[1][i] = dsp.idct_permutation[(j&7) + (j&8)*4 + (j&48)/2];
- }
- }else
- memcpy(s->dv_zigzag[1], ff_zigzag248_direct, 64);
- /* XXX: do it only for constant case */
- dv_build_unquantize_tables(s, dsp.idct_permutation);
- /* FIXME: I really don't think this should be here */
- if (dv_codec_profile(avctx))
- avctx->pix_fmt = dv_codec_profile(avctx)->pix_fmt;
- avctx->coded_frame = &s->picture;
- s->avctx= avctx;
- return 0;
- }
- // #define VLC_DEBUG
- // #define printf(...) av_log(NULL, AV_LOG_ERROR, __VA_ARGS__)
- typedef struct BlockInfo {
- const uint8_t *shift_table;
- const uint8_t *scan_table;
- uint8_t pos; /* position in block */
- uint8_t dct_mode;
- uint8_t partial_bit_count;
- uint16_t partial_bit_buffer;
- int shift_offset;
- } BlockInfo;
- /* block size in bits */
- static const uint16_t block_sizes[6] = {
- 112, 112, 112, 112, 80, 80
- };
- /* bit budget for AC only in 5 MBs */
- static const int vs_total_ac_bits = (100 * 4 + 68*2) * 5;
- /* see dv_88_areas and dv_248_areas for details */
- static const int mb_area_start[5] = { 1, 6, 21, 43, 64 };
- #ifndef ALT_BITSTREAM_READER
- #warning only works with ALT_BITSTREAM_READER
- static int re_index; //Hack to make it compile
- #endif
- static inline int get_bits_left(GetBitContext *s)
- {
- return s->size_in_bits - get_bits_count(s);
- }
- static inline int get_bits_size(GetBitContext *s)
- {
- return s->size_in_bits;
- }
- static inline int put_bits_left(PutBitContext* s)
- {
- return (s->buf_end - s->buf) * 8 - put_bits_count(s);
- }
- /* decode ac coefs */
- static void dv_decode_ac(GetBitContext *gb, BlockInfo *mb, DCTELEM *block)
- {
- int last_index = get_bits_size(gb);
- const uint8_t *scan_table = mb->scan_table;
- const uint8_t *shift_table = mb->shift_table;
- int pos = mb->pos;
- int partial_bit_count = mb->partial_bit_count;
- int level, pos1, run, vlc_len, index;
- OPEN_READER(re, gb);
- UPDATE_CACHE(re, gb);
- /* if we must parse a partial vlc, we do it here */
- if (partial_bit_count > 0) {
- re_cache = ((unsigned)re_cache >> partial_bit_count) |
- (mb->partial_bit_buffer << (sizeof(re_cache)*8 - partial_bit_count));
- re_index -= partial_bit_count;
- mb->partial_bit_count = 0;
- }
- /* get the AC coefficients until last_index is reached */
- for(;;) {
- #ifdef VLC_DEBUG
- printf("%2d: bits=%04x index=%dn", pos, SHOW_UBITS(re, gb, 16), re_index);
- #endif
- /* our own optimized GET_RL_VLC */
- index = NEG_USR32(re_cache, TEX_VLC_BITS);
- vlc_len = dv_rl_vlc[index].len;
- if (vlc_len < 0) {
- index = NEG_USR32((unsigned)re_cache << TEX_VLC_BITS, -vlc_len) + dv_rl_vlc[index].level;
- vlc_len = TEX_VLC_BITS - vlc_len;
- }
- level = dv_rl_vlc[index].level;
- run = dv_rl_vlc[index].run;
- /* gotta check if we're still within gb boundaries */
- if (re_index + vlc_len > last_index) {
- /* should be < 16 bits otherwise a codeword could have been parsed */
- mb->partial_bit_count = last_index - re_index;
- mb->partial_bit_buffer = NEG_USR32(re_cache, mb->partial_bit_count);
- re_index = last_index;
- break;
- }
- re_index += vlc_len;
- #ifdef VLC_DEBUG
- printf("run=%d level=%dn", run, level);
- #endif
- pos += run;
- if (pos >= 64)
- break;
- assert(level);
- pos1 = scan_table[pos];
- block[pos1] = level << shift_table[pos1];
- UPDATE_CACHE(re, gb);
- }
- CLOSE_READER(re, gb);
- mb->pos = pos;
- }
- static inline void bit_copy(PutBitContext *pb, GetBitContext *gb)
- {
- int bits_left = get_bits_left(gb);
- while (bits_left >= MIN_CACHE_BITS) {
- put_bits(pb, MIN_CACHE_BITS, get_bits(gb, MIN_CACHE_BITS));
- bits_left -= MIN_CACHE_BITS;
- }
- if (bits_left > 0) {
- put_bits(pb, bits_left, get_bits(gb, bits_left));
- }
- }
- /* mb_x and mb_y are in units of 8 pixels */
- static inline void dv_decode_video_segment(DVVideoContext *s,
- uint8_t *buf_ptr1,
- const uint16_t *mb_pos_ptr)
- {
- int quant, dc, dct_mode, class1, j;
- int mb_index, mb_x, mb_y, v, last_index;
- DCTELEM *block, *block1;
- int c_offset;
- uint8_t *y_ptr;
- void (*idct_put)(uint8_t *dest, int line_size, DCTELEM *block);
- uint8_t *buf_ptr;
- PutBitContext pb, vs_pb;
- GetBitContext gb;
- BlockInfo mb_data[5 * 6], *mb, *mb1;
- DCTELEM sblock[5*6][64] __align8;
- uint8_t mb_bit_buffer[80 + 4] __align8; /* allow some slack */
- uint8_t vs_bit_buffer[5 * 80 + 4] __align8; /* allow some slack */
- const int log2_blocksize= 3-s->avctx->lowres;
- assert((((int)mb_bit_buffer)&7)==0);
- assert((((int)vs_bit_buffer)&7)==0);
- memset(sblock, 0, sizeof(sblock));
- /* pass 1 : read DC and AC coefficients in blocks */
- buf_ptr = buf_ptr1;
- block1 = &sblock[0][0];
- mb1 = mb_data;
- init_put_bits(&vs_pb, vs_bit_buffer, 5 * 80);
- for(mb_index = 0; mb_index < 5; mb_index++, mb1 += 6, block1 += 6 * 64) {
- /* skip header */
- quant = buf_ptr[3] & 0x0f;
- buf_ptr += 4;
- init_put_bits(&pb, mb_bit_buffer, 80);
- mb = mb1;
- block = block1;
- for(j = 0;j < 6; j++) {
- last_index = block_sizes[j];
- init_get_bits(&gb, buf_ptr, last_index);
- /* get the dc */
- dc = get_sbits(&gb, 9);
- dct_mode = get_bits1(&gb);
- mb->dct_mode = dct_mode;
- mb->scan_table = s->dv_zigzag[dct_mode];
- class1 = get_bits(&gb, 2);
- mb->shift_table = s->dv_idct_shift[class1 == 3][dct_mode]
- [quant + dv_quant_offset[class1]];
- dc = dc << 2;
- /* convert to unsigned because 128 is not added in the
- standard IDCT */
- dc += 1024;
- block[0] = dc;
- buf_ptr += last_index >> 3;
- mb->pos = 0;
- mb->partial_bit_count = 0;
- #ifdef VLC_DEBUG
- printf("MB block: %d, %d ", mb_index, j);
- #endif
- dv_decode_ac(&gb, mb, block);
- /* write the remaining bits in a new buffer only if the
- block is finished */
- if (mb->pos >= 64)
- bit_copy(&pb, &gb);
- block += 64;
- mb++;
- }
- /* pass 2 : we can do it just after */
- #ifdef VLC_DEBUG
- printf("***pass 2 size=%d MB#=%dn", put_bits_count(&pb), mb_index);
- #endif
- block = block1;
- mb = mb1;
- init_get_bits(&gb, mb_bit_buffer, put_bits_count(&pb));
- flush_put_bits(&pb);
- for(j = 0;j < 6; j++, block += 64, mb++) {
- if (mb->pos < 64 && get_bits_left(&gb) > 0) {
- dv_decode_ac(&gb, mb, block);
- /* if still not finished, no need to parse other blocks */
- if (mb->pos < 64)
- break;
- }
- }
- /* all blocks are finished, so the extra bytes can be used at
- the video segment level */
- if (j >= 6)
- bit_copy(&vs_pb, &gb);
- }
- /* we need a pass other the whole video segment */
- #ifdef VLC_DEBUG
- printf("***pass 3 size=%dn", put_bits_count(&vs_pb));
- #endif
- block = &sblock[0][0];
- mb = mb_data;
- init_get_bits(&gb, vs_bit_buffer, put_bits_count(&vs_pb));
- flush_put_bits(&vs_pb);
- for(mb_index = 0; mb_index < 5; mb_index++) {
- for(j = 0;j < 6; j++) {
- if (mb->pos < 64) {
- #ifdef VLC_DEBUG
- printf("start %d:%dn", mb_index, j);
- #endif
- dv_decode_ac(&gb, mb, block);
- }
- if (mb->pos >= 64 && mb->pos < 127)
- av_log(NULL, AV_LOG_ERROR, "AC EOB marker is absent pos=%dn", mb->pos);
- block += 64;
- mb++;
- }
- }
- /* compute idct and place blocks */
- block = &sblock[0][0];
- mb = mb_data;
- for(mb_index = 0; mb_index < 5; mb_index++) {
- v = *mb_pos_ptr++;
- mb_x = v & 0xff;
- mb_y = v >> 8;
- y_ptr = s->picture.data[0] + ((mb_y * s->picture.linesize[0] + mb_x)<<log2_blocksize);
- if (s->sys->pix_fmt == PIX_FMT_YUV411P)
- c_offset = ((mb_y * s->picture.linesize[1] + (mb_x >> 2))<<log2_blocksize);
- else
- c_offset = (((mb_y >> 1) * s->picture.linesize[1] + (mb_x >> 1))<<log2_blocksize);
- for(j = 0;j < 6; j++) {
- idct_put = s->idct_put[mb->dct_mode && log2_blocksize==3];
- if (j < 4) {
- if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x < (704 / 8)) {
- /* NOTE: at end of line, the macroblock is handled as 420 */
- idct_put(y_ptr + (j<<log2_blocksize), s->picture.linesize[0], block);
- } else {
- idct_put(y_ptr + (((j & 1) + (j >> 1) * s->picture.linesize[0])<<log2_blocksize),
- s->picture.linesize[0], block);
- }
- } else {
- if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x >= (704 / 8)) {
- uint64_t aligned_pixels[64/8];
- uint8_t *pixels= (uint8_t*)aligned_pixels;
- uint8_t *c_ptr, *c_ptr1, *ptr, *ptr1;
- int x, y, linesize;
- /* NOTE: at end of line, the macroblock is handled as 420 */
- idct_put(pixels, 8, block);
- linesize = s->picture.linesize[6 - j];
- c_ptr = s->picture.data[6 - j] + c_offset;
- ptr = pixels;
- for(y = 0;y < (1<<log2_blocksize); y++) {
- ptr1= ptr + (1<<(log2_blocksize-1));
- c_ptr1 = c_ptr + (linesize<<log2_blocksize);
- for(x=0; x < (1<<(log2_blocksize-1)); x++){
- c_ptr[x]= ptr[x]; c_ptr1[x]= ptr1[x];
- }
- c_ptr += linesize;
- ptr += 8;
- }
- } else {
- /* don't ask me why they inverted Cb and Cr ! */
- idct_put(s->picture.data[6 - j] + c_offset,
- s->picture.linesize[6 - j], block);
- }
- }
- block += 64;
- mb++;
- }
- }
- }
- #ifdef DV_CODEC_TINY_TARGET
- /* Converts run and level (where level != 0) pair into vlc, returning bit size */
- static always_inline int dv_rl2vlc(int run, int level, int sign, uint32_t* vlc)
- {
- int size;
- if (run < DV_VLC_MAP_RUN_SIZE && level < DV_VLC_MAP_LEV_SIZE) {
- *vlc = dv_vlc_map[run][level].vlc | sign;
- size = dv_vlc_map[run][level].size;
- }
- else {
- if (level < DV_VLC_MAP_LEV_SIZE) {
- *vlc = dv_vlc_map[0][level].vlc | sign;
- size = dv_vlc_map[0][level].size;
- } else {
- *vlc = 0xfe00 | (level << 1) | sign;
- size = 16;
- }
- if (run) {
- *vlc |= ((run < 16) ? dv_vlc_map[run-1][0].vlc :
- (0x1f80 | (run - 1))) << size;
- size += (run < 16) ? dv_vlc_map[run-1][0].size : 13;
- }
- }
- return size;
- }
- static always_inline int dv_rl2vlc_size(int run, int level)
- {
- int size;
- if (run < DV_VLC_MAP_RUN_SIZE && level < DV_VLC_MAP_LEV_SIZE) {
- size = dv_vlc_map[run][level].size;
- }
- else {
- size = (level < DV_VLC_MAP_LEV_SIZE) ? dv_vlc_map[0][level].size : 16;
- if (run) {
- size += (run < 16) ? dv_vlc_map[run-1][0].size : 13;
- }
- }
- return size;
- }
- #else
- static always_inline int dv_rl2vlc(int run, int l, int sign, uint32_t* vlc)
- {
- *vlc = dv_vlc_map[run][l].vlc | sign;
- return dv_vlc_map[run][l].size;
- }
- static always_inline int dv_rl2vlc_size(int run, int l)
- {
- return dv_vlc_map[run][l].size;
- }
- #endif
- typedef struct EncBlockInfo {
- int area_q[4];
- int bit_size[4];
- int prev[5];
- int cur_ac;
- int cno;
- int dct_mode;
- DCTELEM mb[64];
- uint8_t next[64];
- uint8_t sign[64];
- uint8_t partial_bit_count;
- uint32_t partial_bit_buffer; /* we can't use uint16_t here */
- } EncBlockInfo;
- static always_inline PutBitContext* dv_encode_ac(EncBlockInfo* bi, PutBitContext* pb_pool,
- PutBitContext* pb_end)
- {
- int prev;
- int bits_left;
- PutBitContext* pb = pb_pool;
- int size = bi->partial_bit_count;
- uint32_t vlc = bi->partial_bit_buffer;
- bi->partial_bit_count = bi->partial_bit_buffer = 0;
- for(;;){
- /* Find suitable storage space */
- for (; size > (bits_left = put_bits_left(pb)); pb++) {
- if (bits_left) {
- size -= bits_left;
- put_bits(pb, bits_left, vlc >> size);
- vlc = vlc & ((1<<size)-1);
- }
- if (pb + 1 >= pb_end) {
- bi->partial_bit_count = size;
- bi->partial_bit_buffer = vlc;
- return pb;
- }
- }
- /* Store VLC */
- put_bits(pb, size, vlc);
- if(bi->cur_ac>=64)
- break;
- /* Construct the next VLC */
- prev= bi->cur_ac;
- bi->cur_ac = bi->next[prev];
- if(bi->cur_ac < 64){
- size = dv_rl2vlc(bi->cur_ac - prev - 1, bi->mb[bi->cur_ac], bi->sign[bi->cur_ac], &vlc);
- } else {
- size = 4; vlc = 6; /* End Of Block stamp */
- }
- }
- return pb;
- }
- static always_inline void dv_set_class_number(DCTELEM* blk, EncBlockInfo* bi,
- const uint8_t* zigzag_scan, int bias)
- {
- int i, area;
- static const int classes[] = {12, 24, 36, 0xffff};
- int max=12;
- int prev=0;
- bi->mb[0] = blk[0];
- for (area = 0; area < 4; area++) {
- bi->prev[area] = prev;
- bi->bit_size[area] = 1; // 4 areas 4 bits for EOB :)
- for (i=mb_area_start[area]; i<mb_area_start[area+1]; i++) {
- int level = blk[zigzag_scan[i]];
- if (level+15 > 30U) {
- bi->sign[i] = (level>>31)&1;
- bi->mb[i] = level= ABS(level)>>4;
- if(level>max) max= level;
- bi->bit_size[area] += dv_rl2vlc_size(i - prev - 1, level);
- bi->next[prev]= i;
- prev= i;
- }
- }
- }
- bi->next[prev]= i;
- for(bi->cno = 0; max > classes[bi->cno]; bi->cno++);
- bi->cno += bias;
- if (bi->cno >= 3) {
- bi->cno = 3;
- prev=0;
- i= bi->next[prev];
- for (area = 0; area < 4; area++) {
- bi->prev[area] = prev;
- bi->bit_size[area] = 1; // 4 areas 4 bits for EOB :)
- for (; i<mb_area_start[area+1]; i= bi->next[i]) {
- bi->mb[i] >>=1;
- if (bi->mb[i]) {
- bi->bit_size[area] += dv_rl2vlc_size(i - prev - 1, bi->mb[i]);
- bi->next[prev]= i;
- prev= i;
- }
- }
- }
- bi->next[prev]= i;
- }
- }
- //FIXME replace this by dsputil
- #define SC(x, y) ((s[x] - s[y]) ^ ((s[x] - s[y]) >> 7))
- static always_inline int dv_guess_dct_mode(DCTELEM *blk) {
- DCTELEM *s;
- int score88 = 0;
- int score248 = 0;
- int i;
- /* Compute 8-8 score (small values give a better chance for 8-8 DCT) */
- s = blk;
- for(i=0; i<7; i++) {
- score88 += SC(0, 8) + SC(1, 9) + SC(2, 10) + SC(3, 11) +
- SC(4, 12) + SC(5,13) + SC(6, 14) + SC(7, 15);
- s += 8;
- }
- /* Compute 2-4-8 score (small values give a better chance for 2-4-8 DCT) */
- s = blk;
- for(i=0; i<6; i++) {
- score248 += SC(0, 16) + SC(1,17) + SC(2, 18) + SC(3, 19) +
- SC(4, 20) + SC(5,21) + SC(6, 22) + SC(7, 23);
- s += 8;
- }
- return (score88 - score248 > -10);
- }
- static inline void dv_guess_qnos(EncBlockInfo* blks, int* qnos)
- {
- int size[5];
- int i, j, k, a, prev;
- EncBlockInfo* b;
- do {
- b = blks;
- for (i=0; i<5; i++) {
- if (!qnos[i])
- continue;
- qnos[i]--;
- size[i] = 0;
- for (j=0; j<6; j++, b++) {
- for (a=0; a<4; a++) {
- if (b->area_q[a] != dv_quant_shifts[qnos[i] + dv_quant_offset[b->cno]][a]) {
- b->bit_size[a] = 1; // 4 areas 4 bits for EOB :)
- b->area_q[a]++;
- prev= b->prev[a];
- for (k= b->next[prev] ; k<mb_area_start[a+1]; k= b->next[k]) {
- b->mb[k] >>= 1;
- if (b->mb[k]) {
- b->bit_size[a] += dv_rl2vlc_size(k - prev - 1, b->mb[k]);
- prev= k;
- } else {
- b->next[prev] = b->next[k];
- }
- }
- b->prev[a+1]= prev;
- }
- size[i] += b->bit_size[a];
- }
- }
- }
- } while ((vs_total_ac_bits < size[0] + size[1] + size[2] + size[3] + size[4]) &&
- (qnos[0]|qnos[1]|qnos[2]|qnos[3]|qnos[4]));
- }
- /*
- * This is a very rough initial implementaion. The performance is
- * horrible and the weighting is missing. But it's missing from the
- * decoding step also -- so at least we're on the same page with decoder ;-)
- */
- static inline void dv_encode_video_segment(DVVideoContext *s,
- uint8_t *dif,
- const uint16_t *mb_pos_ptr)
- {
- int mb_index, i, j, v;
- int mb_x, mb_y, c_offset, linesize;
- uint8_t* y_ptr;
- uint8_t* data;
- uint8_t* ptr;
- int do_edge_wrap;
- DCTELEM block[64] __align8;
- EncBlockInfo enc_blks[5*6];
- PutBitContext pbs[5*6];
- PutBitContext* pb;
- EncBlockInfo* enc_blk;
- int vs_bit_size = 0;
- int qnos[5];
- assert((((int)block) & 7) == 0);
- enc_blk = &enc_blks[0];
- pb = &pbs[0];
- for(mb_index = 0; mb_index < 5; mb_index++) {
- v = *mb_pos_ptr++;
- mb_x = v & 0xff;
- mb_y = v >> 8;
- y_ptr = s->picture.data[0] + (mb_y * s->picture.linesize[0] * 8) + (mb_x * 8);
- c_offset = (s->sys->pix_fmt == PIX_FMT_YUV411P) ?
- ((mb_y * s->picture.linesize[1] * 8) + ((mb_x >> 2) * 8)) :
- (((mb_y >> 1) * s->picture.linesize[1] * 8) + ((mb_x >> 1) * 8));
- do_edge_wrap = 0;
- qnos[mb_index] = 15; /* No quantization */
- ptr = dif + mb_index*80 + 4;
- for(j = 0;j < 6; j++) {
- if (j < 4) { /* Four Y blocks */
- /* NOTE: at end of line, the macroblock is handled as 420 */
- if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x < (704 / 8)) {
- data = y_ptr + (j * 8);
- } else {
- data = y_ptr + ((j & 1) * 8) + ((j >> 1) * 8 * s->picture.linesize[0]);
- }
- linesize = s->picture.linesize[0];
- } else { /* Cr and Cb blocks */
- /* don't ask Fabrice why they inverted Cb and Cr ! */
- data = s->picture.data[6 - j] + c_offset;
- linesize = s->picture.linesize[6 - j];
- if (s->sys->pix_fmt == PIX_FMT_YUV411P && mb_x >= (704 / 8))
- do_edge_wrap = 1;
- }
- /* Everything is set up -- now just copy data -> DCT block */
- if (do_edge_wrap) { /* Edge wrap copy: 4x16 -> 8x8 */
- uint8_t* d;
- DCTELEM *b = block;
- for (i=0;i<8;i++) {
- d = data + 8 * linesize;
- b[0] = data[0]; b[1] = data[1]; b[2] = data[2]; b[3] = data[3];
- b[4] = d[0]; b[5] = d[1]; b[6] = d[2]; b[7] = d[3];
- data += linesize;
- b += 8;
- }
- } else { /* Simple copy: 8x8 -> 8x8 */
- s->get_pixels(block, data, linesize);
- }
- if(s->avctx->flags & CODEC_FLAG_INTERLACED_DCT)
- enc_blk->dct_mode = dv_guess_dct_mode(block);
- else
- enc_blk->dct_mode = 0;
- enc_blk->area_q[0] = enc_blk->area_q[1] = enc_blk->area_q[2] = enc_blk->area_q[3] = 0;
- enc_blk->partial_bit_count = 0;
- enc_blk->partial_bit_buffer = 0;
- enc_blk->cur_ac = 0;
- s->fdct[enc_blk->dct_mode](block);
- dv_set_class_number(block, enc_blk,
- enc_blk->dct_mode ? ff_zigzag248_direct : ff_zigzag_direct, j/4);
- init_put_bits(pb, ptr, block_sizes[j]/8);
- put_bits(pb, 9, (uint16_t)(((enc_blk->mb[0] >> 3) - 1024 + 2) >> 2));
- put_bits(pb, 1, enc_blk->dct_mode);
- put_bits(pb, 2, enc_blk->cno);
- vs_bit_size += enc_blk->bit_size[0] + enc_blk->bit_size[1] +
- enc_blk->bit_size[2] + enc_blk->bit_size[3];
- ++enc_blk;
- ++pb;
- ptr += block_sizes[j]/8;
- }
- }
- if (vs_total_ac_bits < vs_bit_size)
- dv_guess_qnos(&enc_blks[0], &qnos[0]);
- for (i=0; i<5; i++) {
- dif[i*80 + 3] = qnos[i];
- }
- /* First pass over individual cells only */
- for (j=0; j<5*6; j++)
- dv_encode_ac(&enc_blks[j], &pbs[j], &pbs[j+1]);
- /* Second pass over each MB space */
- for (j=0; j<5*6; j+=6) {
- pb= &pbs[j];
- for (i=0; i<6; i++) {
- if (enc_blks[i+j].partial_bit_count)
- pb=dv_encode_ac(&enc_blks[i+j], pb, &pbs[j+6]);
- }
- }
- /* Third and final pass over the whole vides segment space */
- pb= &pbs[0];
- for (j=0; j<5*6; j++) {
- if (enc_blks[j].partial_bit_count)
- pb=dv_encode_ac(&enc_blks[j], pb, &pbs[6*5]);
- }
- for (j=0; j<5*6; j++)
- flush_put_bits(&pbs[j]);
- }
- static int dv_decode_mt(AVCodecContext *avctx, void* sl)
- {
- DVVideoContext *s = avctx->priv_data;
- int slice = (size_t)sl;
- dv_decode_video_segment(s, &s->buf[((slice/27)*6+(slice/3)+slice*5+7)*80],
- &s->sys->video_place[slice*5]);
- return 0;
- }
- static int dv_encode_mt(AVCodecContext *avctx, void* sl)
- {
- DVVideoContext *s = avctx->priv_data;
- int slice = (size_t)sl;
- dv_encode_video_segment(s, &s->buf[((slice/27)*6+(slice/3)+slice*5+7)*80],
- &s->sys->video_place[slice*5]);
- return 0;
- }
- /* NOTE: exactly one frame must be given (120000 bytes for NTSC,
- 144000 bytes for PAL) */
- static int dvvideo_decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- uint8_t *buf, int buf_size)
- {
- DVVideoContext *s = avctx->priv_data;
- s->sys = dv_frame_profile(buf);
- if (!s->sys || buf_size < s->sys->frame_size)
- return -1; /* NOTE: we only accept several full frames */
- if(s->picture.data[0])
- avctx->release_buffer(avctx, &s->picture);
- s->picture.reference = 0;
- s->picture.key_frame = 1;
- s->picture.pict_type = FF_I_TYPE;
- avctx->pix_fmt = s->sys->pix_fmt;
- avcodec_set_dimensions(avctx, s->sys->width, s->sys->height);
- if(avctx->get_buffer(avctx, &s->picture) < 0) {
- av_log(avctx, AV_LOG_ERROR, "get_buffer() failedn");
- return -1;
- }
- s->picture.interlaced_frame = 1;
- s->picture.top_field_first = 0;
- s->buf = buf;
- avctx->execute(avctx, dv_decode_mt, (void**)&dv_anchor[0], NULL,
- s->sys->difseg_size * 27);
- emms_c();
- /* return image */
- *data_size = sizeof(AVFrame);
- *(AVFrame*)data= s->picture;
- return s->sys->frame_size;
- }
- static int dvvideo_encode_frame(AVCodecContext *c, uint8_t *buf, int buf_size,
- void *data)
- {
- DVVideoContext *s = c->priv_data;
- s->sys = dv_codec_profile(c);
- if (!s->sys)
- return -1;
- if(buf_size < s->sys->frame_size)
- return -1;
- c->pix_fmt = s->sys->pix_fmt;
- s->picture = *((AVFrame *)data);
- s->picture.key_frame = 1;
- s->picture.pict_type = FF_I_TYPE;
- s->buf = buf;
- c->execute(c, dv_encode_mt, (void**)&dv_anchor[0], NULL,
- s->sys->difseg_size * 27);
- emms_c();
- return s->sys->frame_size;
- }
- #ifdef CONFIG_DVVIDEO_ENCODER
- AVCodec dvvideo_encoder = {
- "dvvideo",
- CODEC_TYPE_VIDEO,
- CODEC_ID_DVVIDEO,
- sizeof(DVVideoContext),
- dvvideo_init,
- dvvideo_encode_frame,
- NULL,
- NULL,
- CODEC_CAP_DR1,
- NULL
- };
- #endif // CONFIG_DVVIDEO_ENCODER
- AVCodec dvvideo_decoder = {
- "dvvideo",
- CODEC_TYPE_VIDEO,
- CODEC_ID_DVVIDEO,
- sizeof(DVVideoContext),
- dvvideo_init,
- NULL,
- NULL,
- dvvideo_decode_frame,
- CODEC_CAP_DR1,
- NULL
- };