making act segmenter

1 files changed, 813 insertions, 0 deletions

diff --git a/ffmpeg/libavcodec/h263dec.c b/ffmpeg/libavcodec/h263dec.c
new file mode 100644
index 0000000..66d00d4
--- /dev/null
+++ b/ffmpeg/libavcodec/h263dec.c
@@ -0,0 +1,813 @@
+/*
+ * H.263 decoder
+ * Copyright (c) 2001 Fabrice Bellard
+ * Copyright (c) 2002-2004 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg 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 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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 FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+/**
+ * @file
+ * H.263 decoder.
+ */
+
+#define UNCHECKED_BITSTREAM_READER 1
+
+#include "libavutil/cpu.h"
+#include "internal.h"
+#include "avcodec.h"
+#include "error_resilience.h"
+#include "mpegvideo.h"
+#include "h263.h"
+#include "h263_parser.h"
+#include "mpeg4video_parser.h"
+#include "msmpeg4.h"
+#include "vdpau_internal.h"
+#include "thread.h"
+#include "flv.h"
+#include "mpeg4video.h"
+
+//#define DEBUG
+//#define PRINT_FRAME_TIME
+
+av_cold int ff_h263_decode_init(AVCodecContext *avctx)
+{
+    MpegEncContext *s = avctx->priv_data;
+    int ret;
+
+    s->avctx = avctx;
+    s->out_format = FMT_H263;
+
+    s->width  = avctx->coded_width;
+    s->height = avctx->coded_height;
+    s->workaround_bugs= avctx->workaround_bugs;
+
+    // set defaults
+    ff_MPV_decode_defaults(s);
+    s->quant_precision=5;
+    s->decode_mb= ff_h263_decode_mb;
+    s->low_delay= 1;
+    if (avctx->codec->id == AV_CODEC_ID_MSS2)
+        avctx->pix_fmt = AV_PIX_FMT_YUV420P;
+    else
+        avctx->pix_fmt = avctx->get_format(avctx, avctx->codec->pix_fmts);
+    s->unrestricted_mv= 1;
+
+    /* select sub codec */
+    switch(avctx->codec->id) {
+    case AV_CODEC_ID_H263:
+    case AV_CODEC_ID_H263P:
+        s->unrestricted_mv= 0;
+        avctx->chroma_sample_location = AVCHROMA_LOC_CENTER;
+        break;
+    case AV_CODEC_ID_MPEG4:
+        break;
+    case AV_CODEC_ID_MSMPEG4V1:
+        s->h263_pred = 1;
+        s->msmpeg4_version=1;
+        break;
+    case AV_CODEC_ID_MSMPEG4V2:
+        s->h263_pred = 1;
+        s->msmpeg4_version=2;
+        break;
+    case AV_CODEC_ID_MSMPEG4V3:
+        s->h263_pred = 1;
+        s->msmpeg4_version=3;
+        break;
+    case AV_CODEC_ID_WMV1:
+        s->h263_pred = 1;
+        s->msmpeg4_version=4;
+        break;
+    case AV_CODEC_ID_WMV2:
+        s->h263_pred = 1;
+        s->msmpeg4_version=5;
+        break;
+    case AV_CODEC_ID_VC1:
+    case AV_CODEC_ID_WMV3:
+    case AV_CODEC_ID_VC1IMAGE:
+    case AV_CODEC_ID_WMV3IMAGE:
+    case AV_CODEC_ID_MSS2:
+        s->h263_pred = 1;
+        s->msmpeg4_version=6;
+        avctx->chroma_sample_location = AVCHROMA_LOC_LEFT;
+        break;
+    case AV_CODEC_ID_H263I:
+        break;
+    case AV_CODEC_ID_FLV1:
+        s->h263_flv = 1;
+        break;
+    default:
+        return AVERROR(EINVAL);
+    }
+    s->codec_id= avctx->codec->id;
+    avctx->hwaccel= ff_find_hwaccel(avctx->codec->id, avctx->pix_fmt);
+
+    /* for h263, we allocate the images after having read the header */
+    if (avctx->codec->id != AV_CODEC_ID_H263 && avctx->codec->id != AV_CODEC_ID_H263P && avctx->codec->id != AV_CODEC_ID_MPEG4)
+        if ((ret = ff_MPV_common_init(s)) < 0)
+            return ret;
+
+        ff_h263_decode_init_vlc();
+
+    return 0;
+}
+
+av_cold int ff_h263_decode_end(AVCodecContext *avctx)
+{
+    MpegEncContext *s = avctx->priv_data;
+
+    ff_MPV_common_end(s);
+    return 0;
+}
+
+/**
+ * Return the number of bytes consumed for building the current frame.
+ */
+static int get_consumed_bytes(MpegEncContext *s, int buf_size){
+    int pos= (get_bits_count(&s->gb)+7)>>3;
+
+    if(s->divx_packed || s->avctx->hwaccel){
+        //we would have to scan through the whole buf to handle the weird reordering ...
+        return buf_size;
+    }else if(s->flags&CODEC_FLAG_TRUNCATED){
+        pos -= s->parse_context.last_index;
+        if(pos<0) pos=0; // padding is not really read so this might be -1
+        return pos;
+    }else{
+        if(pos==0) pos=1; //avoid infinite loops (i doubt that is needed but ...)
+        if(pos+10>buf_size) pos=buf_size; // oops ;)
+
+        return pos;
+    }
+}
+
+static int decode_slice(MpegEncContext *s){
+    const int part_mask= s->partitioned_frame ? (ER_AC_END|ER_AC_ERROR) : 0x7F;
+    const int mb_size= 16>>s->avctx->lowres;
+    int ret;
+
+    s->last_resync_gb= s->gb;
+    s->first_slice_line= 1;
+
+    s->resync_mb_x= s->mb_x;
+    s->resync_mb_y= s->mb_y;
+
+    ff_set_qscale(s, s->qscale);
+
+    if (s->avctx->hwaccel) {
+        const uint8_t *start= s->gb.buffer + get_bits_count(&s->gb)/8;
+        const uint8_t *end  = ff_h263_find_resync_marker(s, start + 1, s->gb.buffer_end);
+        skip_bits_long(&s->gb, 8*(end - start));
+        return s->avctx->hwaccel->decode_slice(s->avctx, start, end - start);
+    }
+
+    if(s->partitioned_frame){
+        const int qscale= s->qscale;
+
+        if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4){
+            if ((ret = ff_mpeg4_decode_partitions(s)) < 0)
+                return ret;
+        }
+
+        /* restore variables which were modified */
+        s->first_slice_line=1;
+        s->mb_x= s->resync_mb_x;
+        s->mb_y= s->resync_mb_y;
+        ff_set_qscale(s, qscale);
+    }
+
+    for(; s->mb_y < s->mb_height; s->mb_y++) {
+        /* per-row end of slice checks */
+        if(s->msmpeg4_version){
+            if(s->resync_mb_y + s->slice_height == s->mb_y){
+                ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
+
+                return 0;
+            }
+        }
+
+        if(s->msmpeg4_version==1){
+            s->last_dc[0]=
+            s->last_dc[1]=
+            s->last_dc[2]= 128;
+        }
+
+        ff_init_block_index(s);
+        for(; s->mb_x < s->mb_width; s->mb_x++) {
+            int ret;
+
+            ff_update_block_index(s);
+
+            if(s->resync_mb_x == s->mb_x && s->resync_mb_y+1 == s->mb_y){
+                s->first_slice_line=0;
+            }
+
+            /* DCT & quantize */
+
+            s->mv_dir = MV_DIR_FORWARD;
+            s->mv_type = MV_TYPE_16X16;
+//            s->mb_skipped = 0;
+            av_dlog(s, "%d %d %06X\n",
+                    ret, get_bits_count(&s->gb), show_bits(&s->gb, 24));
+            ret= s->decode_mb(s, s->block);
+
+            if (s->pict_type!=AV_PICTURE_TYPE_B)
+                ff_h263_update_motion_val(s);
+
+            if(ret<0){
+                const int xy= s->mb_x + s->mb_y*s->mb_stride;
+                if(ret==SLICE_END){
+                    ff_MPV_decode_mb(s, s->block);
+                    if(s->loop_filter)
+                        ff_h263_loop_filter(s);
+
+                    ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask);
+
+                    s->padding_bug_score--;
+
+                    if(++s->mb_x >= s->mb_width){
+                        s->mb_x=0;
+                        ff_mpeg_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
+                        ff_MPV_report_decode_progress(s);
+                        s->mb_y++;
+                    }
+                    return 0;
+                }else if(ret==SLICE_NOEND){
+                    av_log(s->avctx, AV_LOG_ERROR, "Slice mismatch at MB: %d\n", xy);
+                    ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x+1, s->mb_y, ER_MB_END&part_mask);
+                    return AVERROR_INVALIDDATA;
+                }
+                av_log(s->avctx, AV_LOG_ERROR, "Error at MB: %d\n", xy);
+                ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_ERROR&part_mask);
+
+                return AVERROR_INVALIDDATA;
+            }
+
+            ff_MPV_decode_mb(s, s->block);
+            if(s->loop_filter)
+                ff_h263_loop_filter(s);
+        }
+
+        ff_mpeg_draw_horiz_band(s, s->mb_y*mb_size, mb_size);
+        ff_MPV_report_decode_progress(s);
+
+        s->mb_x= 0;
+    }
+
+    av_assert1(s->mb_x==0 && s->mb_y==s->mb_height);
+
+    if(s->codec_id==AV_CODEC_ID_MPEG4
+       && (s->workaround_bugs&FF_BUG_AUTODETECT)
+       && get_bits_left(&s->gb) >= 48
+       && show_bits(&s->gb, 24)==0x4010
+       && !s->data_partitioning)
+        s->padding_bug_score+=32;
+
+    /* try to detect the padding bug */
+    if(      s->codec_id==AV_CODEC_ID_MPEG4
+       &&   (s->workaround_bugs&FF_BUG_AUTODETECT)
+       &&    get_bits_left(&s->gb) >=0
+       &&    get_bits_left(&s->gb) < 137
+//       &&   !s->resync_marker
+       &&   !s->data_partitioning){
+
+        const int bits_count= get_bits_count(&s->gb);
+        const int bits_left = s->gb.size_in_bits - bits_count;
+
+        if(bits_left==0){
+            s->padding_bug_score+=16;
+        } else if(bits_left != 1){
+            int v= show_bits(&s->gb, 8);
+            v|= 0x7F >> (7-(bits_count&7));
+
+            if(v==0x7F && bits_left<=8)
+                s->padding_bug_score--;
+            else if(v==0x7F && ((get_bits_count(&s->gb)+8)&8) && bits_left<=16)
+                s->padding_bug_score+= 4;
+            else
+                s->padding_bug_score++;
+        }
+    }
+
+    if(s->workaround_bugs&FF_BUG_AUTODETECT){
+        if(s->padding_bug_score > -2 && !s->data_partitioning /*&& (s->divx_version>=0 || !s->resync_marker)*/)
+            s->workaround_bugs |=  FF_BUG_NO_PADDING;
+        else
+            s->workaround_bugs &= ~FF_BUG_NO_PADDING;
+    }
+
+    // handle formats which don't have unique end markers
+    if(s->msmpeg4_version || (s->workaround_bugs&FF_BUG_NO_PADDING)){ //FIXME perhaps solve this more cleanly
+        int left= get_bits_left(&s->gb);
+        int max_extra=7;
+
+        /* no markers in M$ crap */
+        if(s->msmpeg4_version && s->pict_type==AV_PICTURE_TYPE_I)
+            max_extra+= 17;
+
+        /* buggy padding but the frame should still end approximately at the bitstream end */
+        if((s->workaround_bugs&FF_BUG_NO_PADDING) && (s->err_recognition&(AV_EF_BUFFER|AV_EF_AGGRESSIVE)))
+            max_extra+= 48;
+        else if((s->workaround_bugs&FF_BUG_NO_PADDING))
+            max_extra+= 256*256*256*64;
+
+        if(left>max_extra){
+            av_log(s->avctx, AV_LOG_ERROR, "discarding %d junk bits at end, next would be %X\n", left, show_bits(&s->gb, 24));
+        }
+        else if(left<0){
+            av_log(s->avctx, AV_LOG_ERROR, "overreading %d bits\n", -left);
+        }else
+            ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, ER_MB_END);
+
+        return 0;
+    }
+
+    av_log(s->avctx, AV_LOG_ERROR, "slice end not reached but screenspace end (%d left %06X, score= %d)\n",
+            get_bits_left(&s->gb),
+            show_bits(&s->gb, 24), s->padding_bug_score);
+
+    ff_er_add_slice(&s->er, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, ER_MB_END&part_mask);
+
+    return AVERROR_INVALIDDATA;
+}
+
+int ff_h263_decode_frame(AVCodecContext *avctx,
+                             void *data, int *got_frame,
+                             AVPacket *avpkt)
+{
+    const uint8_t *buf = avpkt->data;
+    int buf_size = avpkt->size;
+    MpegEncContext *s = avctx->priv_data;
+    int ret;
+    AVFrame *pict = data;
+
+#ifdef PRINT_FRAME_TIME
+uint64_t time= rdtsc();
+#endif
+    s->flags= avctx->flags;
+    s->flags2= avctx->flags2;
+
+    /* no supplementary picture */
+    if (buf_size == 0) {
+        /* special case for last picture */
+        if (s->low_delay==0 && s->next_picture_ptr) {
+            if ((ret = av_frame_ref(pict, &s->next_picture_ptr->f)) < 0)
+                return ret;
+            s->next_picture_ptr= NULL;
+
+            *got_frame = 1;
+        }
+
+        return 0;
+    }
+
+    if(s->flags&CODEC_FLAG_TRUNCATED){
+        int next;
+
+        if(CONFIG_MPEG4_DECODER && s->codec_id==AV_CODEC_ID_MPEG4){
+            next= ff_mpeg4_find_frame_end(&s->parse_context, buf, buf_size);
+        }else if(CONFIG_H263_DECODER && s->codec_id==AV_CODEC_ID_H263){
+            next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
+        }else if(CONFIG_H263P_DECODER && s->codec_id==AV_CODEC_ID_H263P){
+            next= ff_h263_find_frame_end(&s->parse_context, buf, buf_size);
+        }else{
+            av_log(s->avctx, AV_LOG_ERROR, "this codec does not support truncated bitstreams\n");
+            return AVERROR(EINVAL);
+        }
+
+        if( ff_combine_frame(&s->parse_context, next, (const uint8_t **)&buf, &buf_size) < 0 )
+            return buf_size;
+    }
+
+
+retry:
+    if(s->divx_packed && s->bitstream_buffer_size){
+        int i;
+        for(i=0; i<buf_size-3; i++){
+            if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1){
+                if(buf[i+3]==0xB0){
+                    av_log(s->avctx, AV_LOG_WARNING, "Discarding excessive bitstream in packed xvid\n");
+                    s->bitstream_buffer_size=0;
+                }
+                break;
+            }
+        }
+    }
+
+    if(s->bitstream_buffer_size && (s->divx_packed || buf_size<20)){ //divx 5.01+/xvid frame reorder
+        init_get_bits(&s->gb, s->bitstream_buffer, s->bitstream_buffer_size*8);
+    }else
+        init_get_bits(&s->gb, buf, buf_size*8);
+    s->bitstream_buffer_size=0;
+
+    if (!s->context_initialized) {
+        if ((ret = ff_MPV_common_init(s)) < 0) //we need the idct permutaton for reading a custom matrix
+            return ret;
+    }
+
+    /* We need to set current_picture_ptr before reading the header,
+     * otherwise we cannot store anyting in there */
+    if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) {
+        int i= ff_find_unused_picture(s, 0);
+        if (i < 0)
+            return i;
+        s->current_picture_ptr= &s->picture[i];
+    }
+
+    /* let's go :-) */
+    if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5) {
+        ret= ff_wmv2_decode_picture_header(s);
+    } else if (CONFIG_MSMPEG4_DECODER && s->msmpeg4_version) {
+        ret = ff_msmpeg4_decode_picture_header(s);
+    } else if (CONFIG_MPEG4_DECODER && s->h263_pred) {
+        if(s->avctx->extradata_size && s->picture_number==0){
+            GetBitContext gb;
+
+            init_get_bits(&gb, s->avctx->extradata, s->avctx->extradata_size*8);
+            ret = ff_mpeg4_decode_picture_header(s, &gb);
+        }
+        ret = ff_mpeg4_decode_picture_header(s, &s->gb);
+    } else if (CONFIG_H263I_DECODER && s->codec_id == AV_CODEC_ID_H263I) {
+        ret = ff_intel_h263_decode_picture_header(s);
+    } else if (CONFIG_FLV_DECODER && s->h263_flv) {
+        ret = ff_flv_decode_picture_header(s);
+    } else {
+        ret = ff_h263_decode_picture_header(s);
+    }
+
+    if (ret < 0 || ret==FRAME_SKIPPED) {
+        if (   s->width  != avctx->coded_width
+            || s->height != avctx->coded_height) {
+                av_log(s->avctx, AV_LOG_WARNING, "Reverting picture dimensions change due to header decoding failure\n");
+                s->width = avctx->coded_width;
+                s->height= avctx->coded_height;
+        }
+    }
+    if(ret==FRAME_SKIPPED) return get_consumed_bytes(s, buf_size);
+
+    /* skip if the header was thrashed */
+    if (ret < 0){
+        av_log(s->avctx, AV_LOG_ERROR, "header damaged\n");
+        return ret;
+    }
+
+    avctx->has_b_frames= !s->low_delay;
+
+    if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
+        if(s->stream_codec_tag == AV_RL32("XVID") ||
+           s->codec_tag == AV_RL32("XVID") || s->codec_tag == AV_RL32("XVIX") ||
+           s->codec_tag == AV_RL32("RMP4") || s->codec_tag == AV_RL32("ZMP4") ||
+           s->codec_tag == AV_RL32("SIPP")
+           )
+            s->xvid_build= 0;
+#if 0
+        if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==1
+           && s->padding_bug_score > 0 && s->low_delay) // XVID with modified fourcc
+            s->xvid_build= 0;
+#endif
+    }
+
+    if(s->xvid_build==-1 && s->divx_version==-1 && s->lavc_build==-1){
+        if(s->codec_tag == AV_RL32("DIVX") && s->vo_type==0 && s->vol_control_parameters==0)
+            s->divx_version= 400; //divx 4
+    }
+
+    if(s->xvid_build>=0 && s->divx_version>=0){
+        s->divx_version=
+        s->divx_build= -1;
+    }
+
+    if(s->workaround_bugs&FF_BUG_AUTODETECT){
+        if(s->codec_tag == AV_RL32("XVIX"))
+            s->workaround_bugs|= FF_BUG_XVID_ILACE;
+
+        if(s->codec_tag == AV_RL32("UMP4")){
+            s->workaround_bugs|= FF_BUG_UMP4;
+        }
+
+        if(s->divx_version>=500 && s->divx_build<1814){
+            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
+        }
+
+        if(s->divx_version>502 && s->divx_build<1814){
+            s->workaround_bugs|= FF_BUG_QPEL_CHROMA2;
+        }
+
+        if(s->xvid_build<=3U)
+            s->padding_bug_score= 256*256*256*64;
+
+        if(s->xvid_build<=1U)
+            s->workaround_bugs|= FF_BUG_QPEL_CHROMA;
+
+        if(s->xvid_build<=12U)
+            s->workaround_bugs|= FF_BUG_EDGE;
+
+        if(s->xvid_build<=32U)
+            s->workaround_bugs|= FF_BUG_DC_CLIP;
+
+#define SET_QPEL_FUNC(postfix1, postfix2) \
+    s->dsp.put_ ## postfix1 = ff_put_ ## postfix2;\
+    s->dsp.put_no_rnd_ ## postfix1 = ff_put_no_rnd_ ## postfix2;\
+    s->dsp.avg_ ## postfix1 = ff_avg_ ## postfix2;
+
+        if(s->lavc_build<4653U)
+            s->workaround_bugs|= FF_BUG_STD_QPEL;
+
+        if(s->lavc_build<4655U)
+            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
+
+        if(s->lavc_build<4670U){
+            s->workaround_bugs|= FF_BUG_EDGE;
+        }
+
+        if(s->lavc_build<=4712U)
+            s->workaround_bugs|= FF_BUG_DC_CLIP;
+
+        if(s->divx_version>=0)
+            s->workaround_bugs|= FF_BUG_DIRECT_BLOCKSIZE;
+        if(s->divx_version==501 && s->divx_build==20020416)
+            s->padding_bug_score= 256*256*256*64;
+
+        if(s->divx_version<500U){
+            s->workaround_bugs|= FF_BUG_EDGE;
+        }
+
+        if(s->divx_version>=0)
+            s->workaround_bugs|= FF_BUG_HPEL_CHROMA;
+#if 0
+        if(s->divx_version==500)
+            s->padding_bug_score= 256*256*256*64;
+
+        /* very ugly XVID padding bug detection FIXME/XXX solve this differently
+         * Let us hope this at least works.
+         */
+        if(   s->resync_marker==0 && s->data_partitioning==0 && s->divx_version==-1
+           && s->codec_id==AV_CODEC_ID_MPEG4 && s->vo_type==0)
+            s->workaround_bugs|= FF_BUG_NO_PADDING;
+
+        if(s->lavc_build<4609U) //FIXME not sure about the version num but a 4609 file seems ok
+            s->workaround_bugs|= FF_BUG_NO_PADDING;
+#endif
+    }
+
+    if(s->workaround_bugs& FF_BUG_STD_QPEL){
+        SET_QPEL_FUNC(qpel_pixels_tab[0][ 5], qpel16_mc11_old_c)
+        SET_QPEL_FUNC(qpel_pixels_tab[0][ 7], qpel16_mc31_old_c)
+        SET_QPEL_FUNC(qpel_pixels_tab[0][ 9], qpel16_mc12_old_c)
+        SET_QPEL_FUNC(qpel_pixels_tab[0][11], qpel16_mc32_old_c)
+        SET_QPEL_FUNC(qpel_pixels_tab[0][13], qpel16_mc13_old_c)
+        SET_QPEL_FUNC(qpel_pixels_tab[0][15], qpel16_mc33_old_c)
+
+        SET_QPEL_FUNC(qpel_pixels_tab[1][ 5], qpel8_mc11_old_c)
+        SET_QPEL_FUNC(qpel_pixels_tab[1][ 7], qpel8_mc31_old_c)
+        SET_QPEL_FUNC(qpel_pixels_tab[1][ 9], qpel8_mc12_old_c)
+        SET_QPEL_FUNC(qpel_pixels_tab[1][11], qpel8_mc32_old_c)
+        SET_QPEL_FUNC(qpel_pixels_tab[1][13], qpel8_mc13_old_c)
+        SET_QPEL_FUNC(qpel_pixels_tab[1][15], qpel8_mc33_old_c)
+    }
+
+    if(avctx->debug & FF_DEBUG_BUGS)
+        av_log(s->avctx, AV_LOG_DEBUG, "bugs: %X lavc_build:%d xvid_build:%d divx_version:%d divx_build:%d %s\n",
+               s->workaround_bugs, s->lavc_build, s->xvid_build, s->divx_version, s->divx_build,
+               s->divx_packed ? "p" : "");
+
+#if HAVE_MMX
+    if (s->codec_id == AV_CODEC_ID_MPEG4 && s->xvid_build>=0 && avctx->idct_algo == FF_IDCT_AUTO && (av_get_cpu_flags() & AV_CPU_FLAG_MMX)) {
+        avctx->idct_algo= FF_IDCT_XVIDMMX;
+        ff_dct_common_init(s);
+        goto retry;
+    }
+#endif
+
+        /* 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 ((!avctx->coded_width || !avctx->coded_height) && 0) {
+        ParseContext pc= s->parse_context; //FIXME move these demuxng hack to avformat
+
+        s->parse_context.buffer=0;
+        ff_MPV_common_end(s);
+        s->parse_context= pc;
+        avcodec_set_dimensions(avctx, s->width, s->height);
+
+        goto retry;
+    }
+
+    if (s->width  != avctx->coded_width  ||
+        s->height != avctx->coded_height ||
+        s->context_reinit) {
+        /* H.263 could change picture size any time */
+        s->context_reinit = 0;
+
+        avcodec_set_dimensions(avctx, s->width, s->height);
+
+        if ((ret = ff_MPV_common_frame_size_change(s)))
+            return ret;
+    }
+
+    if((s->codec_id==AV_CODEC_ID_H263 || s->codec_id==AV_CODEC_ID_H263P || s->codec_id == AV_CODEC_ID_H263I))
+        s->gob_index = ff_h263_get_gob_height(s);
+
+    // for skipping the frame
+    s->current_picture.f.pict_type = s->pict_type;
+    s->current_picture.f.key_frame = s->pict_type == AV_PICTURE_TYPE_I;
+
+    /* skip B-frames if we don't have reference frames */
+    if (s->last_picture_ptr == NULL &&
+        (s->pict_type == AV_PICTURE_TYPE_B || s->droppable))
+        return get_consumed_bytes(s, buf_size);
+    if(   (avctx->skip_frame >= AVDISCARD_NONREF && s->pict_type==AV_PICTURE_TYPE_B)
+       || (avctx->skip_frame >= AVDISCARD_NONKEY && s->pict_type!=AV_PICTURE_TYPE_I)
+       ||  avctx->skip_frame >= AVDISCARD_ALL)
+        return get_consumed_bytes(s, buf_size);
+
+    if(s->next_p_frame_damaged){
+        if(s->pict_type==AV_PICTURE_TYPE_B)
+            return get_consumed_bytes(s, buf_size);
+        else
+            s->next_p_frame_damaged=0;
+    }
+
+    if((!s->no_rounding) || s->pict_type==AV_PICTURE_TYPE_B){
+        s->me.qpel_put= s->dsp.put_qpel_pixels_tab;
+        s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
+    }else{
+        s->me.qpel_put= s->dsp.put_no_rnd_qpel_pixels_tab;
+        s->me.qpel_avg= s->dsp.avg_qpel_pixels_tab;
+    }
+
+    if ((ret = ff_MPV_frame_start(s, avctx)) < 0)
+        return ret;
+
+    if (!s->divx_packed) ff_thread_finish_setup(avctx);
+
+    if (CONFIG_MPEG4_VDPAU_DECODER && (s->avctx->codec->capabilities & CODEC_CAP_HWACCEL_VDPAU)) {
+        ff_vdpau_mpeg4_decode_picture(s, s->gb.buffer, s->gb.buffer_end - s->gb.buffer);
+        goto frame_end;
+    }
+
+    if (avctx->hwaccel) {
+        if ((ret = avctx->hwaccel->start_frame(avctx, s->gb.buffer, s->gb.buffer_end - s->gb.buffer)) < 0)
+            return ret;
+    }
+
+    ff_mpeg_er_frame_start(s);
+
+    //the second part of the wmv2 header contains the MB skip bits which are stored in current_picture->mb_type
+    //which is not available before ff_MPV_frame_start()
+    if (CONFIG_WMV2_DECODER && s->msmpeg4_version==5){
+        ret = ff_wmv2_decode_secondary_picture_header(s);
+        if(ret<0) return ret;
+        if(ret==1) goto intrax8_decoded;
+    }
+
+    /* decode each macroblock */
+    s->mb_x=0;
+    s->mb_y=0;
+
+    ret = decode_slice(s);
+    while(s->mb_y<s->mb_height){
+        if(s->msmpeg4_version){
+            if(s->slice_height==0 || s->mb_x!=0 || (s->mb_y%s->slice_height)!=0 || get_bits_left(&s->gb)<0)
+                break;
+        }else{
+            int prev_x=s->mb_x, prev_y=s->mb_y;
+            if(ff_h263_resync(s)<0)
+                break;
+            if (prev_y * s->mb_width + prev_x < s->mb_y * s->mb_width + s->mb_x)
+                s->er.error_occurred = 1;
+        }
+
+        if(s->msmpeg4_version<4 && s->h263_pred)
+            ff_mpeg4_clean_buffers(s);
+
+        if (decode_slice(s) < 0) ret = AVERROR_INVALIDDATA;
+    }
+
+    if (s->msmpeg4_version && s->msmpeg4_version<4 && s->pict_type==AV_PICTURE_TYPE_I)
+        if(!CONFIG_MSMPEG4_DECODER || ff_msmpeg4_decode_ext_header(s, buf_size) < 0){
+            s->er.error_status_table[s->mb_num - 1] = ER_MB_ERROR;
+        }
+
+    av_assert1(s->bitstream_buffer_size==0);
+frame_end:
+    /* divx 5.01+ bitstream reorder stuff */
+    if(s->codec_id==AV_CODEC_ID_MPEG4 && s->divx_packed){
+        int current_pos= s->gb.buffer == s->bitstream_buffer ? 0 : (get_bits_count(&s->gb)>>3);
+        int startcode_found=0;
+
+        if(buf_size - current_pos > 7){
+            int i;
+            for(i=current_pos; i<buf_size-4; i++){
+                if(buf[i]==0 && buf[i+1]==0 && buf[i+2]==1 && buf[i+3]==0xB6){
+                    startcode_found=!(buf[i+4]&0x40);
+                    break;
+                }
+            }
+        }
+
+        if(startcode_found){
+            av_fast_malloc(
+                &s->bitstream_buffer,
+                &s->allocated_bitstream_buffer_size,
+                buf_size - current_pos + FF_INPUT_BUFFER_PADDING_SIZE);
+            if (!s->bitstream_buffer)
+                return AVERROR(ENOMEM);
+            memcpy(s->bitstream_buffer, buf + current_pos, buf_size - current_pos);
+            s->bitstream_buffer_size= buf_size - current_pos;
+        }
+    }
+
+intrax8_decoded:
+    ff_er_frame_end(&s->er);
+
+    if (avctx->hwaccel) {
+        if ((ret = avctx->hwaccel->end_frame(avctx)) < 0)
+            return ret;
+    }
+
+    ff_MPV_frame_end(s);
+
+    assert(s->current_picture.f.pict_type == s->current_picture_ptr->f.pict_type);
+    assert(s->current_picture.f.pict_type == s->pict_type);
+    if (s->pict_type == AV_PICTURE_TYPE_B || s->low_delay) {
+        if ((ret = av_frame_ref(pict, &s->current_picture_ptr->f)) < 0)
+            return ret;
+        ff_print_debug_info(s, s->current_picture_ptr, pict);
+        ff_mpv_export_qp_table(s, pict, s->current_picture_ptr, FF_QSCALE_TYPE_MPEG1);
+    } else if (s->last_picture_ptr != NULL) {
+        if ((ret = av_frame_ref(pict, &s->last_picture_ptr->f)) < 0)
+            return ret;
+        ff_print_debug_info(s, s->last_picture_ptr, pict);
+        ff_mpv_export_qp_table(s, pict, s->last_picture_ptr, FF_QSCALE_TYPE_MPEG1);
+    }
+
+    if(s->last_picture_ptr || s->low_delay){
+        *got_frame = 1;
+    }
+
+#ifdef PRINT_FRAME_TIME
+av_log(avctx, AV_LOG_DEBUG, "%"PRId64"\n", rdtsc()-time);
+#endif
+
+    return (ret && (avctx->err_recognition & AV_EF_EXPLODE))?ret:get_consumed_bytes(s, buf_size);
+}
+
+const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[] = {
+#if CONFIG_VAAPI
+    AV_PIX_FMT_VAAPI_VLD,
+#endif
+#if CONFIG_VDPAU
+    AV_PIX_FMT_VDPAU,
+#endif
+    AV_PIX_FMT_YUV420P,
+    AV_PIX_FMT_NONE
+};
+
+AVCodec ff_h263_decoder = {
+    .name           = "h263",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_H263,
+    .priv_data_size = sizeof(MpegEncContext),
+    .init           = ff_h263_decode_init,
+    .close          = ff_h263_decode_end,
+    .decode         = ff_h263_decode_frame,
+    .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
+                      CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
+    .flush          = ff_mpeg_flush,
+    .max_lowres     = 3,
+    .long_name      = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
+    .pix_fmts       = ff_h263_hwaccel_pixfmt_list_420,
+};
+
+AVCodec ff_h263p_decoder = {
+    .name           = "h263p",
+    .type           = AVMEDIA_TYPE_VIDEO,
+    .id             = AV_CODEC_ID_H263P,
+    .priv_data_size = sizeof(MpegEncContext),
+    .init           = ff_h263_decode_init,
+    .close          = ff_h263_decode_end,
+    .decode         = ff_h263_decode_frame,
+    .capabilities   = CODEC_CAP_DRAW_HORIZ_BAND | CODEC_CAP_DR1 |
+                      CODEC_CAP_TRUNCATED | CODEC_CAP_DELAY,
+    .flush          = ff_mpeg_flush,
+    .max_lowres     = 3,
+    .long_name      = NULL_IF_CONFIG_SMALL("H.263 / H.263-1996, H.263+ / H.263-1998 / H.263 version 2"),
+    .pix_fmts       = ff_h263_hwaccel_pixfmt_list_420,
+};