static int h263_decode_frame(AVCodecContext *avctx, void *data, int *data_size, UINT8 *buf, int buf_size) { MpegEncContext *s = avctx->priv_data; int ret; AVPicture *pict = data; #ifdef DEBUG printf("*****frame %d size=%d\n", avctx->frame_number, buf_size); printf("bytes=%x %x %x %x\n", buf[0], buf[1], buf[2], buf[3]); #endif /* no supplementary picture */ if (buf_size == 0) { *data_size = 0; return 0; } if(s->bitstream_buffer_size) //divx 5.01+ frame reorder init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size); else init_get_bits(&s->gb, buf, buf_size); /* let's go :-) */ if (s->h263_msmpeg4) { ret = msmpeg4_decode_picture_header(s); } else if (s->h263_pred) { ret = mpeg4_decode_picture_header(s); s->has_b_frames= !s->low_delay; } else if (s->h263_intel) { ret = intel_h263_decode_picture_header(s); } else { ret = h263_decode_picture_header(s); } /* After H263 & mpeg4 header decode we have the height, width,*/ /* and other parameters. So then we could init the picture */ /* FIXME: By the way H263 decoder is evolving it should have */ /* an H263EncContext */ if (!s->context_initialized) { avctx->width = s->width; avctx->height = s->height; avctx->aspect_ratio_info= s->aspect_ratio_info; if (MPV_common_init(s) < 0) return -1; } else if (s->width != avctx->width || s->height != avctx->height) { /* H.263 could change picture size any time */ MPV_common_end(s); if (MPV_common_init(s) < 0) return -1; } if(ret==FRAME_SKIPED) return 0; if (ret < 0) return -1; /* skip b frames if we dont have reference frames */ if(s->num_available_buffers<2 && s->pict_type==B_TYPE) return 0; MPV_frame_start(s); #ifdef DEBUG printf("qscale=%d\n", s->qscale); #endif /* decode each macroblock */ s->block_wrap[0]= s->block_wrap[1]= s->block_wrap[2]= s->block_wrap[3]= s->mb_width*2 + 2; s->block_wrap[4]= s->block_wrap[5]= s->mb_width + 2; for(s->mb_y=0; s->mb_y < s->mb_height; s->mb_y++) { /* Check for GOB headers on H.263 */ /* FIXME: In the future H.263+ will have intra prediction */ /* and we are gonna need another way to detect MPEG4 */ if (s->mb_y && !s->h263_pred) { s->first_gob_line = h263_decode_gob_header(s); } s->block_index[0]= s->block_wrap[0]*(s->mb_y*2 + 1) - 1; s->block_index[1]= s->block_wrap[0]*(s->mb_y*2 + 1); s->block_index[2]= s->block_wrap[0]*(s->mb_y*2 + 2) - 1; s->block_index[3]= s->block_wrap[0]*(s->mb_y*2 + 2); s->block_index[4]= s->block_wrap[4]*(s->mb_y + 1) + s->block_wrap[0]*(s->mb_height*2 + 2); s->block_index[5]= s->block_wrap[4]*(s->mb_y + 1 + s->mb_height + 2) + s->block_wrap[0]*(s->mb_height*2 + 2); for(s->mb_x=0; s->mb_x < s->mb_width; s->mb_x++) { s->block_index[0]+=2; s->block_index[1]+=2; s->block_index[2]+=2; s->block_index[3]+=2; s->block_index[4]++; s->block_index[5]++; #ifdef DEBUG printf("**mb x=%d y=%d\n", s->mb_x, s->mb_y); #endif //fprintf(stderr,"\nFrame: %d\tMB: %d",avctx->frame_number, (s->mb_y * s->mb_width) + s->mb_x); /* DCT & quantize */ if (s->h263_msmpeg4) { msmpeg4_dc_scale(s); } else if (s->h263_pred) { h263_dc_scale(s); } else { /* default quantization values */ s->y_dc_scale = 8; s->c_dc_scale = 8; } clear_blocks(s->block[0]); s->mv_dir = MV_DIR_FORWARD; s->mv_type = MV_TYPE_16X16; if (s->h263_msmpeg4) { if (msmpeg4_decode_mb(s, s->block) < 0) { fprintf(stderr,"\nError at MB: %d\n", (s->mb_y * s->mb_width) + s->mb_x); return -1; } } else { if (h263_decode_mb(s, s->block) < 0) { fprintf(stderr,"\nError at MB: %d\n", (s->mb_y * s->mb_width) + s->mb_x); return -1; } } MPV_decode_mb(s, s->block); } if ( avctx->draw_horiz_band && (s->num_available_buffers>=1 || (!s->has_b_frames)) ) { UINT8 *src_ptr[3]; int y, h, offset; y = s->mb_y * 16; h = s->height - y; if (h > 16) h = 16; offset = y * s->linesize; if(s->pict_type==B_TYPE || (!s->has_b_frames)){ src_ptr[0] = s->current_picture[0] + offset; src_ptr[1] = s->current_picture[1] + (offset >> 2); src_ptr[2] = s->current_picture[2] + (offset >> 2); } else { src_ptr[0] = s->last_picture[0] + offset; src_ptr[1] = s->last_picture[1] + (offset >> 2); src_ptr[2] = s->last_picture[2] + (offset >> 2); } avctx->draw_horiz_band(avctx, src_ptr, s->linesize, y, s->width, h); } } if (s->h263_msmpeg4 && s->msmpeg4_version<4 && s->pict_type==I_TYPE) if(msmpeg4_decode_ext_header(s, buf_size) < 0) return -1; /* divx 5.01+ bistream reorder stuff */ if(s->h263_pred && s->bitstream_buffer_size==0){ int current_pos= get_bits_count(&s->gb)/8; if( buf_size - current_pos > 5 && buf_size - current_pos < BITSTREAM_BUFFER_SIZE){ memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos); s->bitstream_buffer_size= buf_size - current_pos; } }else s->bitstream_buffer_size=0; MPV_frame_end(s); if(s->pict_type==B_TYPE || (!s->has_b_frames)){ pict->data[0] = s->current_picture[0]; pict->data[1] = s->current_picture[1]; pict->data[2] = s->current_picture[2]; } else { pict->data[0] = s->last_picture[0]; pict->data[1] = s->last_picture[1]; pict->data[2] = s->last_picture[2]; } pict->linesize[0] = s->linesize; pict->linesize[1] = s->linesize / 2; pict->linesize[2] = s->linesize / 2; avctx->quality = s->qscale; /* Return the Picture timestamp as the frame number */ /* we substract 1 because it is added on utils.c */ avctx->frame_number = s->picture_number - 1; /* dont output the last pic after seeking note we allready added +1 for the current pix in MPV_frame_end(s) */ if(s->num_available_buffers>=2 || (!s->has_b_frames)) *data_size = sizeof(AVPicture); return buf_size; }