VC1: Support dynamic dimension changes

Fixes SA00072, SA00073, SA10150, SA10151, Issue2076

Improves SA10153
Signed-off-by: Anton Khirnov <anton@khirnov.net>

libavcodec/vc1.c

@@ -453,9 +453,6 @@ static int decode_sequence_header_adv(VC1Context *v, GetBitContext *gb)
     v->finterpflag = get_bits1(gb);
     skip_bits1(gb); // reserved
 
-    v->s.h_edge_pos = v->s.avctx->coded_width;
-    v->s.v_edge_pos = v->s.avctx->coded_height;
-
     av_log(v->s.avctx, AV_LOG_DEBUG,
                "Advanced Profile level %i:\nfrmrtq_postproc=%i, bitrtq_postproc=%i\n"
                "LoopFilter=%i, ChromaFormat=%i, Pulldown=%i, Interlace: %i\n"
@@ -474,8 +471,8 @@ static int decode_sequence_header_adv(VC1Context *v, GetBitContext *gb)
     if(get_bits1(gb)) { //Display Info - decoding is not affected by it
         int w, h, ar = 0;
         av_log(v->s.avctx, AV_LOG_DEBUG, "Display extended info:\n");
-        v->s.avctx->width  = w = get_bits(gb, 14) + 1;
-        v->s.avctx->height = h = get_bits(gb, 14) + 1;
+        w = get_bits(gb, 14) + 1;
+        h = get_bits(gb, 14) + 1;
         av_log(v->s.avctx, AV_LOG_DEBUG, "Display dimensions: %ix%i\n", w, h);
         if(get_bits1(gb))
             ar = get_bits(gb, 4);
@@ -485,6 +482,12 @@ static int decode_sequence_header_adv(VC1Context *v, GetBitContext *gb)
             w = get_bits(gb, 8) + 1;
             h = get_bits(gb, 8) + 1;
             v->s.avctx->sample_aspect_ratio = (AVRational){w, h};
+        } else {
+            av_reduce(&v->s.avctx->sample_aspect_ratio.num,
+                      &v->s.avctx->sample_aspect_ratio.den,
+                      v->s.avctx->height * w,
+                      v->s.avctx->width * h,
+                      1<<30);
         }
         av_log(v->s.avctx, AV_LOG_DEBUG, "Aspect: %i:%i\n", v->s.avctx->sample_aspect_ratio.num, v->s.avctx->sample_aspect_ratio.den);
 
@@ -552,8 +555,8 @@ int vc1_decode_entry_point(AVCodecContext *avctx, VC1Context *v, GetBitContext *
     }
 
     if(get_bits1(gb)){
-        avctx->coded_width = (get_bits(gb, 12)+1)<<1;
-        avctx->coded_height = (get_bits(gb, 12)+1)<<1;
+        avctx->width = avctx->coded_width = (get_bits(gb, 12)+1)<<1;
+        avctx->height = avctx->coded_height = (get_bits(gb, 12)+1)<<1;
     }
     if(v->extended_mv)
         v->extended_dmv = get_bits1(gb);

libavcodec/vc1dec.c

@@ -3551,6 +3551,58 @@ static void vc1_sprite_flush(AVCodecContext *avctx)
 
 #endif
 
+static av_cold int vc1_decode_init_alloc_tables(VC1Context *v)
+{
+    MpegEncContext *s = &v->s;
+    int i;
+
+    /* Allocate mb bitplanes */
+    v->mv_type_mb_plane = av_malloc(s->mb_stride * s->mb_height);
+    v->direct_mb_plane = av_malloc(s->mb_stride * s->mb_height);
+    v->acpred_plane = av_malloc(s->mb_stride * s->mb_height);
+    v->over_flags_plane = av_malloc(s->mb_stride * s->mb_height);
+
+    v->n_allocated_blks = s->mb_width + 2;
+    v->block = av_malloc(sizeof(*v->block) * v->n_allocated_blks);
+    v->cbp_base = av_malloc(sizeof(v->cbp_base[0]) * 2 * s->mb_stride);
+    v->cbp = v->cbp_base + s->mb_stride;
+    v->ttblk_base = av_malloc(sizeof(v->ttblk_base[0]) * 2 * s->mb_stride);
+    v->ttblk = v->ttblk_base + s->mb_stride;
+    v->is_intra_base = av_malloc(sizeof(v->is_intra_base[0]) * 2 * s->mb_stride);
+    v->is_intra = v->is_intra_base + s->mb_stride;
+    v->luma_mv_base = av_malloc(sizeof(v->luma_mv_base[0]) * 2 * s->mb_stride);
+    v->luma_mv = v->luma_mv_base + s->mb_stride;
+
+    /* allocate block type info in that way so it could be used with s->block_index[] */
+    v->mb_type_base = av_malloc(s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);
+    v->mb_type[0] = v->mb_type_base + s->b8_stride + 1;
+    v->mb_type[1] = v->mb_type_base + s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride + 1;
+    v->mb_type[2] = v->mb_type[1] + s->mb_stride * (s->mb_height + 1);
+
+    /* Init coded blocks info */
+    if (v->profile == PROFILE_ADVANCED)
+    {
+//        if (alloc_bitplane(&v->over_flags_plane, s->mb_width, s->mb_height) < 0)
+//            return -1;
+//        if (alloc_bitplane(&v->ac_pred_plane, s->mb_width, s->mb_height) < 0)
+//            return -1;
+    }
+
+    ff_intrax8_common_init(&v->x8,s);
+
+    if (s->avctx->codec_id == CODEC_ID_WMV3IMAGE || s->avctx->codec_id == CODEC_ID_VC1IMAGE) {
+        for (i = 0; i < 4; i++)
+            if (!(v->sr_rows[i>>1][i%2] = av_malloc(v->output_width))) return -1;
+    }
+
+    if (!v->mv_type_mb_plane || !v->direct_mb_plane || !v->acpred_plane || !v->over_flags_plane ||
+        !v->block || !v->cbp_base || !v->ttblk_base || !v->is_intra_base || !v->luma_mv_base ||
+        !v->mb_type_base)
+            return -1;
+
+    return 0;
+}
+
 /** Initialize a VC1/WMV3 decoder
  * @todo TODO: Handle VC-1 IDUs (Transport level?)
  * @todo TODO: Decypher remaining bits in extra_data
@@ -3560,7 +3612,7 @@ static av_cold int vc1_decode_init(AVCodecContext *avctx)
     VC1Context *v = avctx->priv_data;
     MpegEncContext *s = &v->s;
     GetBitContext gb;
-    int i, cur_width, cur_height;
+    int i;
 
     /* save the container output size for WMImage */
     v->output_width  = avctx->width;
@@ -3580,13 +3632,9 @@ static av_cold int vc1_decode_init(AVCodecContext *avctx)
         avctx->idct_algo=FF_IDCT_WMV2;
     }
 
-    if(ff_msmpeg4_decode_init(avctx) < 0)
-        return -1;
     if (vc1_init_common(v) < 0) return -1;
     ff_vc1dsp_init(&v->vc1dsp);
 
-    cur_width = avctx->coded_width = avctx->width;
-    cur_height = avctx->coded_height = avctx->height;
     if (avctx->codec_id == CODEC_ID_WMV3 || avctx->codec_id == CODEC_ID_WMV3IMAGE)
     {
         int count = 0;
@@ -3657,25 +3705,12 @@ static av_cold int vc1_decode_init(AVCodecContext *avctx)
         }
         v->res_sprite = (avctx->codec_tag == MKTAG('W','V','P','2'));
     }
-    // Sequence header information may not have been parsed
-    // yet when ff_msmpeg4_decode_init was called the fist time
-    // above.  If sequence information changes, we need to call
-    // it again.
-    if (cur_width != avctx->width ||
-        cur_height != avctx->height) {
-        MPV_common_end(s);
-        if(ff_msmpeg4_decode_init(avctx) < 0)
-            return -1;
-        avctx->coded_width = avctx->width;
-        avctx->coded_height = avctx->height;
-    }
 
     avctx->profile = v->profile;
     if (v->profile == PROFILE_ADVANCED)
         avctx->level = v->level;
 
     avctx->has_b_frames= !!(avctx->max_b_frames);
-    s->low_delay = !avctx->has_b_frames;
 
     s->mb_width = (avctx->coded_width+15)>>4;
     s->mb_height = (avctx->coded_height+15)>>4;
@@ -3696,46 +3731,7 @@ static av_cold int vc1_decode_init(AVCodecContext *avctx)
         v->top_blk_sh  = 0;
     }
 
-    /* Allocate mb bitplanes */
-    v->mv_type_mb_plane = av_malloc(s->mb_stride * s->mb_height);
-    v->direct_mb_plane = av_malloc(s->mb_stride * s->mb_height);
-    v->acpred_plane = av_malloc(s->mb_stride * s->mb_height);
-    v->over_flags_plane = av_malloc(s->mb_stride * s->mb_height);
-
-    v->n_allocated_blks = s->mb_width + 2;
-    v->block = av_malloc(sizeof(*v->block) * v->n_allocated_blks);
-    v->cbp_base = av_malloc(sizeof(v->cbp_base[0]) * 2 * s->mb_stride);
-    v->cbp = v->cbp_base + s->mb_stride;
-    v->ttblk_base = av_malloc(sizeof(v->ttblk_base[0]) * 2 * s->mb_stride);
-    v->ttblk = v->ttblk_base + s->mb_stride;
-    v->is_intra_base = av_malloc(sizeof(v->is_intra_base[0]) * 2 * s->mb_stride);
-    v->is_intra = v->is_intra_base + s->mb_stride;
-    v->luma_mv_base = av_malloc(sizeof(v->luma_mv_base[0]) * 2 * s->mb_stride);
-    v->luma_mv = v->luma_mv_base + s->mb_stride;
-
-    /* allocate block type info in that way so it could be used with s->block_index[] */
-    v->mb_type_base = av_malloc(s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride * (s->mb_height + 1) * 2);
-    v->mb_type[0] = v->mb_type_base + s->b8_stride + 1;
-    v->mb_type[1] = v->mb_type_base + s->b8_stride * (s->mb_height * 2 + 1) + s->mb_stride + 1;
-    v->mb_type[2] = v->mb_type[1] + s->mb_stride * (s->mb_height + 1);
-
-    /* Init coded blocks info */
-    if (v->profile == PROFILE_ADVANCED)
-    {
-//        if (alloc_bitplane(&v->over_flags_plane, s->mb_width, s->mb_height) < 0)
-//            return -1;
-//        if (alloc_bitplane(&v->ac_pred_plane, s->mb_width, s->mb_height) < 0)
-//            return -1;
-    }
-
-    ff_intrax8_common_init(&v->x8,s);
-
     if (avctx->codec_id == CODEC_ID_WMV3IMAGE || avctx->codec_id == CODEC_ID_VC1IMAGE) {
-        for (i = 0; i < 4; i++)
-            if (!(v->sr_rows[i>>1][i%2] = av_malloc(v->output_width))) return -1;
-
-        s->low_delay = 1;
-
         v->sprite_width  = avctx->coded_width;
         v->sprite_height = avctx->coded_height;
 
@@ -3751,6 +3747,36 @@ static av_cold int vc1_decode_init(AVCodecContext *avctx)
     return 0;
 }
 
+/** Close a VC1/WMV3 decoder
+ * @warning Initial try at using MpegEncContext stuff
+ */
+static av_cold int vc1_decode_end(AVCodecContext *avctx)
+{
+    VC1Context *v = avctx->priv_data;
+    int i;
+
+    if ((avctx->codec_id == CODEC_ID_WMV3IMAGE || avctx->codec_id == CODEC_ID_VC1IMAGE)
+        && v->sprite_output_frame.data[0])
+        avctx->release_buffer(avctx, &v->sprite_output_frame);
+    for (i = 0; i < 4; i++)
+        av_freep(&v->sr_rows[i>>1][i%2]);
+    av_freep(&v->hrd_rate);
+    av_freep(&v->hrd_buffer);
+    MPV_common_end(&v->s);
+    av_freep(&v->mv_type_mb_plane);
+    av_freep(&v->direct_mb_plane);
+    av_freep(&v->acpred_plane);
+    av_freep(&v->over_flags_plane);
+    av_freep(&v->mb_type_base);
+    av_freep(&v->block);
+    av_freep(&v->cbp_base);
+    av_freep(&v->ttblk_base);
+    av_freep(&v->is_intra_base); // FIXME use v->mb_type[]
+    av_freep(&v->luma_mv_base);
+    ff_intrax8_common_end(&v->x8);
+    return 0;
+}
+
 
 /** Decode a VC1/WMV3 frame
  * @todo TODO: Handle VC-1 IDUs (Transport level?)
@@ -3785,13 +3811,6 @@ static int vc1_decode_frame(AVCodecContext *avctx,
         return 0;
     }
 
-    /* We need to set current_picture_ptr before reading the header,
-     * otherwise we cannot store anything in there. */
-    if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) {
-        int i= ff_find_unused_picture(s, 0);
-        s->current_picture_ptr= &s->picture[i];
-    }
-
     if (s->avctx->codec->capabilities&CODEC_CAP_HWACCEL_VDPAU){
         if (v->profile < PROFILE_ADVANCED)
             avctx->pix_fmt = PIX_FMT_VDPAU_WMV3;
@@ -3880,6 +3899,31 @@ static int vc1_decode_frame(AVCodecContext *avctx,
         }
     }
 
+    if (s->context_initialized &&
+        (s->width  != avctx->coded_width ||
+         s->height != avctx->coded_height)) {
+        vc1_decode_end(avctx);
+    }
+
+    if (!s->context_initialized) {
+        if (ff_msmpeg4_decode_init(avctx) < 0 || vc1_decode_init_alloc_tables(v) < 0)
+            return -1;
+
+        s->low_delay = !avctx->has_b_frames || v->res_sprite;
+
+        if (v->profile == PROFILE_ADVANCED) {
+            s->h_edge_pos = avctx->coded_width;
+            s->v_edge_pos = avctx->coded_height;
+        }
+    }
+
+    /* We need to set current_picture_ptr before reading the header,
+     * otherwise we cannot store anything in there. */
+    if (s->current_picture_ptr == NULL || s->current_picture_ptr->f.data[0]) {
+        int i= ff_find_unused_picture(s, 0);
+        s->current_picture_ptr= &s->picture[i];
+    }
+
     // do parse frame header
     if(v->profile < PROFILE_ADVANCED) {
         if(vc1_parse_frame_header(v, &s->gb) == -1) {
@@ -4011,36 +4055,6 @@ err:
 }
 
 
-/** Close a VC1/WMV3 decoder
- * @warning Initial try at using MpegEncContext stuff
- */
-static av_cold int vc1_decode_end(AVCodecContext *avctx)
-{
-    VC1Context *v = avctx->priv_data;
-    int i;
-
-    if ((avctx->codec_id == CODEC_ID_WMV3IMAGE || avctx->codec_id == CODEC_ID_VC1IMAGE)
-        && v->sprite_output_frame.data[0])
-        avctx->release_buffer(avctx, &v->sprite_output_frame);
-    for (i = 0; i < 4; i++)
-        av_freep(&v->sr_rows[i>>1][i%2]);
-    av_freep(&v->hrd_rate);
-    av_freep(&v->hrd_buffer);
-    MPV_common_end(&v->s);
-    av_freep(&v->mv_type_mb_plane);
-    av_freep(&v->direct_mb_plane);
-    av_freep(&v->acpred_plane);
-    av_freep(&v->over_flags_plane);
-    av_freep(&v->mb_type_base);
-    av_freep(&v->block);
-    av_freep(&v->cbp_base);
-    av_freep(&v->ttblk_base);
-    av_freep(&v->is_intra_base); // FIXME use v->mb_type[]
-    av_freep(&v->luma_mv_base);
-    ff_intrax8_common_end(&v->x8);
-    return 0;
-}
-
 static const AVProfile profiles[] = {
     { FF_PROFILE_VC1_SIMPLE,   "Simple"   },
     { FF_PROFILE_VC1_MAIN,     "Main"     },