roqvideo.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:15k
源码类别:
Windows CE
开发平台:
C/C++
- /*
- * Copyright (C) 2003 the ffmpeg project
- *
- * 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 roqvideo.c
- * Id RoQ Video Decoder by Dr. Tim Ferguson
- * For more information about the Id RoQ format, visit:
- * http://www.csse.monash.edu.au/~timf/
- */
- #include <stdio.h>
- #include <stdlib.h>
- #include <string.h>
- #include <unistd.h>
- #include "common.h"
- #include "avcodec.h"
- #include "dsputil.h"
- typedef struct {
- unsigned char y0, y1, y2, y3, u, v;
- } roq_cell;
- typedef struct {
- int idx[4];
- } roq_qcell;
- static int uiclip[1024], *uiclp; /* clipping table */
- #define avg2(a,b) uiclp[(((int)(a)+(int)(b)+1)>>1)]
- #define avg4(a,b,c,d) uiclp[(((int)(a)+(int)(b)+(int)(c)+(int)(d)+2)>>2)]
- typedef struct RoqContext {
- AVCodecContext *avctx;
- DSPContext dsp;
- AVFrame last_frame;
- AVFrame current_frame;
- int first_frame;
- int y_stride;
- int c_stride;
- roq_cell cells[256];
- roq_qcell qcells[256];
- unsigned char *buf;
- int size;
- } RoqContext;
- #define RoQ_INFO 0x1001
- #define RoQ_QUAD_CODEBOOK 0x1002
- #define RoQ_QUAD_VQ 0x1011
- #define RoQ_SOUND_MONO 0x1020
- #define RoQ_SOUND_STEREO 0x1021
- #define RoQ_ID_MOT 0x00
- #define RoQ_ID_FCC 0x01
- #define RoQ_ID_SLD 0x02
- #define RoQ_ID_CCC 0x03
- #define get_byte(in_buffer) *(in_buffer++)
- #define get_word(in_buffer) ((unsigned short)(in_buffer += 2,
- (in_buffer[-1] << 8 | in_buffer[-2])))
- #define get_long(in_buffer) ((unsigned long)(in_buffer += 4,
- (in_buffer[-1] << 24 | in_buffer[-2] << 16 | in_buffer[-3] << 8 | in_buffer[-4])))
- static void apply_vector_2x2(RoqContext *ri, int x, int y, roq_cell *cell)
- {
- unsigned char *yptr;
- yptr = ri->current_frame.data[0] + (y * ri->y_stride) + x;
- *yptr++ = cell->y0;
- *yptr++ = cell->y1;
- yptr += (ri->y_stride - 2);
- *yptr++ = cell->y2;
- *yptr++ = cell->y3;
- ri->current_frame.data[1][(y/2) * (ri->c_stride) + x/2] = cell->u;
- ri->current_frame.data[2][(y/2) * (ri->c_stride) + x/2] = cell->v;
- }
- static void apply_vector_4x4(RoqContext *ri, int x, int y, roq_cell *cell)
- {
- unsigned long row_inc, c_row_inc;
- register unsigned char y0, y1, u, v;
- unsigned char *yptr, *uptr, *vptr;
- yptr = ri->current_frame.data[0] + (y * ri->y_stride) + x;
- uptr = ri->current_frame.data[1] + (y/2) * (ri->c_stride) + x/2;
- vptr = ri->current_frame.data[2] + (y/2) * (ri->c_stride) + x/2;
- row_inc = ri->y_stride - 4;
- c_row_inc = (ri->c_stride) - 2;
- *yptr++ = y0 = cell->y0; *uptr++ = u = cell->u; *vptr++ = v = cell->v;
- *yptr++ = y0;
- *yptr++ = y1 = cell->y1; *uptr++ = u; *vptr++ = v;
- *yptr++ = y1;
- yptr += row_inc;
- *yptr++ = y0;
- *yptr++ = y0;
- *yptr++ = y1;
- *yptr++ = y1;
- yptr += row_inc; uptr += c_row_inc; vptr += c_row_inc;
- *yptr++ = y0 = cell->y2; *uptr++ = u; *vptr++ = v;
- *yptr++ = y0;
- *yptr++ = y1 = cell->y3; *uptr++ = u; *vptr++ = v;
- *yptr++ = y1;
- yptr += row_inc;
- *yptr++ = y0;
- *yptr++ = y0;
- *yptr++ = y1;
- *yptr++ = y1;
- }
- static void apply_motion_4x4(RoqContext *ri, int x, int y, unsigned char mv,
- signed char mean_x, signed char mean_y)
- {
- int i, hw, mx, my;
- unsigned char *pa, *pb;
- mx = x + 8 - (mv >> 4) - mean_x;
- my = y + 8 - (mv & 0xf) - mean_y;
- /* check MV against frame boundaries */
- if ((mx < 0) || (mx > ri->avctx->width - 4) ||
- (my < 0) || (my > ri->avctx->height - 4)) {
- av_log(ri->avctx, AV_LOG_ERROR, "motion vector out of bounds: MV = (%d, %d), boundaries = (0, 0, %d, %d)n",
- mx, my, ri->avctx->width, ri->avctx->height);
- return;
- }
- pa = ri->current_frame.data[0] + (y * ri->y_stride) + x;
- pb = ri->last_frame.data[0] + (my * ri->y_stride) + mx;
- for(i = 0; i < 4; i++) {
- pa[0] = pb[0];
- pa[1] = pb[1];
- pa[2] = pb[2];
- pa[3] = pb[3];
- pa += ri->y_stride;
- pb += ri->y_stride;
- }
- hw = ri->y_stride/2;
- pa = ri->current_frame.data[1] + (y * ri->y_stride)/4 + x/2;
- pb = ri->last_frame.data[1] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
- for(i = 0; i < 2; i++) {
- switch(((my & 0x01) << 1) | (mx & 0x01)) {
- case 0:
- pa[0] = pb[0];
- pa[1] = pb[1];
- pa[hw] = pb[hw];
- pa[hw+1] = pb[hw+1];
- break;
- case 1:
- pa[0] = avg2(pb[0], pb[1]);
- pa[1] = avg2(pb[1], pb[2]);
- pa[hw] = avg2(pb[hw], pb[hw+1]);
- pa[hw+1] = avg2(pb[hw+1], pb[hw+2]);
- break;
- case 2:
- pa[0] = avg2(pb[0], pb[hw]);
- pa[1] = avg2(pb[1], pb[hw+1]);
- pa[hw] = avg2(pb[hw], pb[hw*2]);
- pa[hw+1] = avg2(pb[hw+1], pb[(hw*2)+1]);
- break;
- case 3:
- pa[0] = avg4(pb[0], pb[1], pb[hw], pb[hw+1]);
- pa[1] = avg4(pb[1], pb[2], pb[hw+1], pb[hw+2]);
- pa[hw] = avg4(pb[hw], pb[hw+1], pb[hw*2], pb[(hw*2)+1]);
- pa[hw+1] = avg4(pb[hw+1], pb[hw+2], pb[(hw*2)+1], pb[(hw*2)+1]);
- break;
- }
- pa = ri->current_frame.data[2] + (y * ri->y_stride)/4 + x/2;
- pb = ri->last_frame.data[2] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
- }
- }
- static void apply_motion_8x8(RoqContext *ri, int x, int y,
- unsigned char mv, signed char mean_x, signed char mean_y)
- {
- int mx, my, i, j, hw;
- unsigned char *pa, *pb;
- mx = x + 8 - (mv >> 4) - mean_x;
- my = y + 8 - (mv & 0xf) - mean_y;
- /* check MV against frame boundaries */
- if ((mx < 0) || (mx > ri->avctx->width - 8) ||
- (my < 0) || (my > ri->avctx->height - 8)) {
- av_log(ri->avctx, AV_LOG_ERROR, "motion vector out of bounds: MV = (%d, %d), boundaries = (0, 0, %d, %d)n",
- mx, my, ri->avctx->width, ri->avctx->height);
- return;
- }
- pa = ri->current_frame.data[0] + (y * ri->y_stride) + x;
- pb = ri->last_frame.data[0] + (my * ri->y_stride) + mx;
- for(i = 0; i < 8; i++) {
- pa[0] = pb[0];
- pa[1] = pb[1];
- pa[2] = pb[2];
- pa[3] = pb[3];
- pa[4] = pb[4];
- pa[5] = pb[5];
- pa[6] = pb[6];
- pa[7] = pb[7];
- pa += ri->y_stride;
- pb += ri->y_stride;
- }
- hw = ri->c_stride;
- pa = ri->current_frame.data[1] + (y * ri->y_stride)/4 + x/2;
- pb = ri->last_frame.data[1] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
- for(j = 0; j < 2; j++) {
- for(i = 0; i < 4; i++) {
- switch(((my & 0x01) << 1) | (mx & 0x01)) {
- case 0:
- pa[0] = pb[0];
- pa[1] = pb[1];
- pa[2] = pb[2];
- pa[3] = pb[3];
- break;
- case 1:
- pa[0] = avg2(pb[0], pb[1]);
- pa[1] = avg2(pb[1], pb[2]);
- pa[2] = avg2(pb[2], pb[3]);
- pa[3] = avg2(pb[3], pb[4]);
- break;
- case 2:
- pa[0] = avg2(pb[0], pb[hw]);
- pa[1] = avg2(pb[1], pb[hw+1]);
- pa[2] = avg2(pb[2], pb[hw+2]);
- pa[3] = avg2(pb[3], pb[hw+3]);
- break;
- case 3:
- pa[0] = avg4(pb[0], pb[1], pb[hw], pb[hw+1]);
- pa[1] = avg4(pb[1], pb[2], pb[hw+1], pb[hw+2]);
- pa[2] = avg4(pb[2], pb[3], pb[hw+2], pb[hw+3]);
- pa[3] = avg4(pb[3], pb[4], pb[hw+3], pb[hw+4]);
- break;
- }
- pa += ri->c_stride;
- pb += ri->c_stride;
- }
- pa = ri->current_frame.data[2] + (y * ri->y_stride)/4 + x/2;
- pb = ri->last_frame.data[2] + (my/2) * (ri->y_stride/2) + (mx + 1)/2;
- }
- }
- static void roqvideo_decode_frame(RoqContext *ri)
- {
- unsigned int chunk_id = 0, chunk_arg = 0;
- unsigned long chunk_size = 0;
- int i, j, k, nv1, nv2, vqflg = 0, vqflg_pos = -1;
- int vqid, bpos, xpos, ypos, xp, yp, x, y;
- int frame_stats[2][4] = {{0},{0}};
- roq_qcell *qcell;
- unsigned char *buf = ri->buf;
- unsigned char *buf_end = ri->buf + ri->size;
- while (buf < buf_end) {
- chunk_id = get_word(buf);
- chunk_size = get_long(buf);
- chunk_arg = get_word(buf);
- if(chunk_id == RoQ_QUAD_VQ)
- break;
- if(chunk_id == RoQ_QUAD_CODEBOOK) {
- if((nv1 = chunk_arg >> 8) == 0)
- nv1 = 256;
- if((nv2 = chunk_arg & 0xff) == 0 && nv1 * 6 < chunk_size)
- nv2 = 256;
- for(i = 0; i < nv1; i++) {
- ri->cells[i].y0 = get_byte(buf);
- ri->cells[i].y1 = get_byte(buf);
- ri->cells[i].y2 = get_byte(buf);
- ri->cells[i].y3 = get_byte(buf);
- ri->cells[i].u = get_byte(buf);
- ri->cells[i].v = get_byte(buf);
- }
- for(i = 0; i < nv2; i++)
- for(j = 0; j < 4; j++)
- ri->qcells[i].idx[j] = get_byte(buf);
- }
- }
- bpos = xpos = ypos = 0;
- while(bpos < chunk_size) {
- for (yp = ypos; yp < ypos + 16; yp += 8)
- for (xp = xpos; xp < xpos + 16; xp += 8) {
- if (vqflg_pos < 0) {
- vqflg = buf[bpos++]; vqflg |= (buf[bpos++] << 8);
- vqflg_pos = 7;
- }
- vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
- frame_stats[0][vqid]++;
- vqflg_pos--;
- switch(vqid) {
- case RoQ_ID_MOT:
- apply_motion_8x8(ri, xp, yp, 0, 8, 8);
- break;
- case RoQ_ID_FCC:
- apply_motion_8x8(ri, xp, yp, buf[bpos++], chunk_arg >> 8,
- chunk_arg & 0xff);
- break;
- case RoQ_ID_SLD:
- qcell = ri->qcells + buf[bpos++];
- apply_vector_4x4(ri, xp, yp, ri->cells + qcell->idx[0]);
- apply_vector_4x4(ri, xp+4, yp, ri->cells + qcell->idx[1]);
- apply_vector_4x4(ri, xp, yp+4, ri->cells + qcell->idx[2]);
- apply_vector_4x4(ri, xp+4, yp+4, ri->cells + qcell->idx[3]);
- break;
- case RoQ_ID_CCC:
- for (k = 0; k < 4; k++) {
- x = xp; y = yp;
- if(k & 0x01) x += 4;
- if(k & 0x02) y += 4;
- if (vqflg_pos < 0) {
- vqflg = buf[bpos++];
- vqflg |= (buf[bpos++] << 8);
- vqflg_pos = 7;
- }
- vqid = (vqflg >> (vqflg_pos * 2)) & 0x3;
- frame_stats[1][vqid]++;
- vqflg_pos--;
- switch(vqid) {
- case RoQ_ID_MOT:
- apply_motion_4x4(ri, x, y, 0, 8, 8);
- break;
- case RoQ_ID_FCC:
- apply_motion_4x4(ri, x, y, buf[bpos++],
- chunk_arg >> 8, chunk_arg & 0xff);
- break;
- case RoQ_ID_SLD:
- qcell = ri->qcells + buf[bpos++];
- apply_vector_2x2(ri, x, y, ri->cells + qcell->idx[0]);
- apply_vector_2x2(ri, x+2, y, ri->cells + qcell->idx[1]);
- apply_vector_2x2(ri, x, y+2, ri->cells + qcell->idx[2]);
- apply_vector_2x2(ri, x+2, y+2, ri->cells + qcell->idx[3]);
- break;
- case RoQ_ID_CCC:
- apply_vector_2x2(ri, x, y, ri->cells + buf[bpos]);
- apply_vector_2x2(ri, x+2, y, ri->cells + buf[bpos+1]);
- apply_vector_2x2(ri, x, y+2, ri->cells + buf[bpos+2]);
- apply_vector_2x2(ri, x+2, y+2, ri->cells + buf[bpos+3]);
- bpos += 4;
- break;
- }
- }
- break;
- default:
- av_log(ri->avctx, AV_LOG_ERROR, "Unknown vq code: %dn", vqid);
- }
- }
- xpos += 16;
- if (xpos >= ri->avctx->width) {
- xpos -= ri->avctx->width;
- ypos += 16;
- }
- if(ypos >= ri->avctx->height)
- break;
- }
- }
- static int roq_decode_init(AVCodecContext *avctx)
- {
- RoqContext *s = avctx->priv_data;
- int i;
- s->avctx = avctx;
- s->first_frame = 1;
- avctx->pix_fmt = PIX_FMT_YUV420P;
- avctx->has_b_frames = 0;
- dsputil_init(&s->dsp, avctx);
- uiclp = uiclip+512;
- for(i = -512; i < 512; i++)
- uiclp[i] = (i < 0 ? 0 : (i > 255 ? 255 : i));
- return 0;
- }
- static int roq_decode_frame(AVCodecContext *avctx,
- void *data, int *data_size,
- uint8_t *buf, int buf_size)
- {
- RoqContext *s = avctx->priv_data;
- if (avctx->get_buffer(avctx, &s->current_frame)) {
- av_log(avctx, AV_LOG_ERROR, " RoQ: get_buffer() failedn");
- return -1;
- }
- s->y_stride = s->current_frame.linesize[0];
- s->c_stride = s->current_frame.linesize[1];
- s->buf = buf;
- s->size = buf_size;
- roqvideo_decode_frame(s);
- /* release the last frame if it is allocated */
- if (s->first_frame)
- s->first_frame = 0;
- else
- avctx->release_buffer(avctx, &s->last_frame);
- /* shuffle frames */
- s->last_frame = s->current_frame;
- *data_size = sizeof(AVFrame);
- *(AVFrame*)data = s->current_frame;
- return buf_size;
- }
- static int roq_decode_end(AVCodecContext *avctx)
- {
- RoqContext *s = avctx->priv_data;
- /* release the last frame */
- if (s->last_frame.data[0])
- avctx->release_buffer(avctx, &s->last_frame);
- return 0;
- }
- AVCodec roq_decoder = {
- "roqvideo",
- CODEC_TYPE_VIDEO,
- CODEC_ID_ROQ,
- sizeof(RoqContext),
- roq_decode_init,
- NULL,
- roq_decode_end,
- roq_decode_frame,
- CODEC_CAP_DR1,
- };