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@ -1770,18 +1770,15 @@ static void mpeg_decode_extension(AVCodecContext *avctx, |
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} |
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} |
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#define DECODE_SLICE_MB_ADDR_ERROR -3 //we faild decoding the mb_x/y info
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#define DECODE_SLICE_FATAL_ERROR -2 |
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#define DECODE_SLICE_ERROR -1 |
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#define DECODE_SLICE_OK 0 |
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#define DECODE_SLICE_EOP 1 |
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/**
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* decodes a slice. |
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* @return DECODE_SLICE_FATAL_ERROR if a non recoverable error occured<br> |
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* DECODE_SLICE_ERROR if the slice is damaged<br> |
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* DECODE_SLICE_OK if this slice is ok<br> |
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* DECODE_SLICE_EOP if the end of the picture is reached |
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*/ |
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static int mpeg_decode_slice(AVCodecContext *avctx,
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AVFrame *pict, |
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@ -1793,10 +1790,13 @@ static int mpeg_decode_slice(AVCodecContext *avctx, |
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int ret; |
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const int field_pic= s->picture_structure != PICT_FRAME; |
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s->resync_mb_x= s->mb_x =
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s->resync_mb_y= s->mb_y = -1; |
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start_code = (start_code - 1) & 0xff; |
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if (start_code >= s->mb_height){ |
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fprintf(stderr, "slice below image (%d >= %d)\n", start_code, s->mb_height); |
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return DECODE_SLICE_MB_ADDR_ERROR; |
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return -1; |
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} |
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ff_mpeg1_clean_buffers(s); |
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@ -1856,7 +1856,7 @@ static int mpeg_decode_slice(AVCodecContext *avctx, |
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s->qscale = get_qscale(s); |
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if(s->qscale == 0){ |
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fprintf(stderr, "qscale == 0\n"); |
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return DECODE_SLICE_MB_ADDR_ERROR; |
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return -1; |
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} |
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/* extra slice info */ |
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@ -1870,7 +1870,7 @@ static int mpeg_decode_slice(AVCodecContext *avctx, |
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int code = get_vlc2(&s->gb, mbincr_vlc.table, MBINCR_VLC_BITS, 2); |
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if (code < 0){ |
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fprintf(stderr, "first mb_incr damaged\n"); |
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return DECODE_SLICE_MB_ADDR_ERROR; |
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return -1; |
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} |
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if (code >= 33) { |
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if (code == 33) { |
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@ -1901,7 +1901,9 @@ static int mpeg_decode_slice(AVCodecContext *avctx, |
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const int xy = s->mb_x*2 + 1 + (s->mb_y*2 +1)*wrap; |
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int motion_x, motion_y; |
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if (s->mb_intra || s->mv_type == MV_TYPE_16X16) { |
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if (s->mb_intra) { |
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motion_x = motion_y = 0; |
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}else if (s->mv_type == MV_TYPE_16X16) { |
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motion_x = s->mv[0][0][0]; |
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motion_y = s->mv[0][0][1]; |
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} else /*if (s->mv_type == MV_TYPE_FIELD)*/ { |
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@ -1963,20 +1965,26 @@ static int mpeg_decode_slice(AVCodecContext *avctx, |
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} |
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if(s->mb_y<<field_pic >= s->mb_height){ |
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fprintf(stderr, "slice too long\n"); |
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return DECODE_SLICE_ERROR; |
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return -1; |
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} |
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} |
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eos: //end of slice
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eos: // end of slice
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*buf += get_bits_count(&s->gb)/8 - 1; |
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//printf("y %d %d %d %d\n", s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y);
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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); |
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return 0; |
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} |
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emms_c(); |
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*buf += get_bits_count(&s->gb)/8 - 1; |
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//intf("%d %d %d %d\n", s->mb_y, s->mb_height, s->pict_type, s->picture_number);
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/**
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* handles slice ends. |
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* @return 1 if it seems to be the last slice of
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*/ |
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static int slice_end(AVCodecContext *avctx, AVFrame *pict) |
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{ |
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Mpeg1Context *s1 = avctx->priv_data; |
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MpegEncContext *s = &s1->mpeg_enc_ctx; |
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/* end of slice reached */ |
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if (s->mb_y<<field_pic == s->mb_height && !s->first_field) { |
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if (/*s->mb_y<<field_pic == s->mb_height &&*/ !s->first_field) { |
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/* end of image */ |
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if(s->mpeg2){ |
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@ -2000,9 +2008,9 @@ eos: //end of slice |
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ff_print_debug_info(s, s->last_picture_ptr); |
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} |
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} |
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return DECODE_SLICE_EOP; |
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return 1; |
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} else { |
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return DECODE_SLICE_OK; |
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return 0; |
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} |
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} |
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@ -2234,7 +2242,10 @@ static int mpeg_decode_frame(AVCodecContext *avctx, |
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/* find start next code */ |
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start_code = find_start_code(&buf_ptr, buf_end); |
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if (start_code < 0){ |
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// printf("missing end of picture\n");
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if (slice_end(avctx, picture)) { |
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if(s2->last_picture_ptr) //FIXME merge with the stuff in mpeg_decode_slice
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*data_size = sizeof(AVPicture); |
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} |
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return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index); |
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} |
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@ -2274,17 +2285,14 @@ static int mpeg_decode_frame(AVCodecContext *avctx, |
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ret = mpeg_decode_slice(avctx, picture, |
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start_code, &buf_ptr, input_size); |
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emms_c(); |
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if (ret == DECODE_SLICE_EOP) { |
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if(s2->last_picture_ptr) //FIXME merge with the stuff in mpeg_decode_slice
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*data_size = sizeof(AVPicture); |
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return FFMAX(0, buf_ptr - buf - s2->parse_context.last_index); |
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}else if(ret < 0){ |
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if(ret == DECODE_SLICE_ERROR) |
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if(ret < 0){ |
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if(s2->resync_mb_x>=0 && s2->resync_mb_y>=0) |
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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); |
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fprintf(stderr,"Error while decoding slice\n"); |
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if(ret==DECODE_SLICE_FATAL_ERROR) return -1; |
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if(ret==DECODE_SLICE_FATAL_ERROR) return -1; |
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}else{ |
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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); |
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} |
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} |
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break; |
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