h264: Allow discarding the cropping information from SPS

Some 3D systems overload the meaning of the field for other purposes.
Signed-off-by: Luca Barbato <lu_zero@gentoo.org>

libavcodec/avcodec.h

@@ -657,6 +657,8 @@ typedef struct RcOverride{
 #define CODEC_FLAG2_FAST          0x00000001 ///< Allow non spec compliant speedup tricks.
 #define CODEC_FLAG2_NO_OUTPUT     0x00000004 ///< Skip bitstream encoding.
 #define CODEC_FLAG2_LOCAL_HEADER  0x00000008 ///< Place global headers at every keyframe instead of in extradata.
+#define CODEC_FLAG2_IGNORE_CROP   0x00010000 ///< Discard cropping information from SPS.
+
 #if FF_API_MPV_GLOBAL_OPTS
 #define CODEC_FLAG_CBP_RD         0x04000000 ///< Use rate distortion optimization for cbp.
 #define CODEC_FLAG_QP_RD          0x08000000 ///< Use rate distortion optimization for qp selectioon.

libavcodec/h264_ps.c

@@ -425,6 +425,20 @@ int ff_h264_decode_seq_parameter_set(H264Context *h){
         sps->crop_right = get_ue_golomb(&s->gb);
         sps->crop_top   = get_ue_golomb(&s->gb);
         sps->crop_bottom= get_ue_golomb(&s->gb);
+        if (h->s.avctx->flags2 & CODEC_FLAG2_IGNORE_CROP) {
+            av_log(h->s.avctx, AV_LOG_DEBUG,
+                   "discarding sps cropping, "
+                   "original values are l:%u r:%u t:%u b:%u\n",
+                   sps->crop_left,
+                   sps->crop_right,
+                   sps->crop_top,
+                   sps->crop_bottom);
+
+            sps->crop_left   =
+            sps->crop_right  =
+            sps->crop_top    =
+            sps->crop_bottom = 0;
+        }
         if(sps->crop_left || sps->crop_top){
             av_log(h->s.avctx, AV_LOG_ERROR, "insane cropping not completely supported, this could look slightly wrong ...\n");
         }

libavcodec/options_table.h

@@ -76,6 +76,7 @@ static const AVOption options[]={
 {"sgop", "Deprecated, use mpegvideo private options instead", 0, AV_OPT_TYPE_CONST, {.i64 = CODEC_FLAG2_STRICT_GOP }, INT_MIN, INT_MAX, V|E, "flags2"},
 #endif
 {"noout", "skip bitstream encoding", 0, AV_OPT_TYPE_CONST, {.i64 = CODEC_FLAG2_NO_OUTPUT }, INT_MIN, INT_MAX, V|E, "flags2"},
+{"ignorecrop", "ignore cropping information from sps", 1, AV_OPT_TYPE_CONST, {.i64 = CODEC_FLAG2_IGNORE_CROP }, INT_MIN, INT_MAX, V|D, "flags2"},
 {"local_header", "place global headers at every keyframe instead of in extradata", 0, AV_OPT_TYPE_CONST, {.i64 = CODEC_FLAG2_LOCAL_HEADER }, INT_MIN, INT_MAX, V|E, "flags2"},
 #if FF_API_SUB_ID
 {"sub_id", NULL, OFFSET(sub_id), AV_OPT_TYPE_INT, {.i64 = DEFAULT }, INT_MIN, INT_MAX},

libavcodec/version.h

@@ -27,7 +27,7 @@
  */
 
 #define LIBAVCODEC_VERSION_MAJOR 54
-#define LIBAVCODEC_VERSION_MINOR 40
+#define LIBAVCODEC_VERSION_MINOR 41
 #define LIBAVCODEC_VERSION_MICRO  0
 
 #define LIBAVCODEC_VERSION_INT  AV_VERSION_INT(LIBAVCODEC_VERSION_MAJOR, \