matroskadec: parse stereo mode on decoding

Convert the Matroska stereo format to the Stereo3D format, and add a
Stereo3D side data to the stream.

Bump the doctype version supported.

Bug-Id: 728 / https://bugs.debian.org/757185

3 files changed, 77 insertions, 2 deletions

diff --git a/libavformat/matroska.c b/libavformat/matroska.c
index 9628abcda1..237f26f49c 100644
--- a/libavformat/matroska.c
+++ b/libavformat/matroska.c
@@ -19,6 +19,8 @@
  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  */
 
+#include "libavutil/stereo3d.h"
+
 #include "matroska.h"
 
 const CodecTags ff_mkv_codec_tags[]={
@@ -103,3 +105,65 @@ const AVMetadataConv ff_mkv_metadata_conv[] = {
     { "PART_NUMBER"   , "track"  },
     { 0 }
 };
+
+int ff_mkv_stereo3d_conv(AVStream *st, MatroskaVideoStereoModeType stereo_mode)
+{
+    AVPacketSideData *sd, *tmp;
+    AVStereo3D *stereo;
+
+    stereo = av_stereo3d_alloc();
+    if (!stereo)
+        return AVERROR(ENOMEM);
+
+    tmp = av_realloc_array(st->side_data, st->nb_side_data + 1, sizeof(*tmp));
+    if (!tmp) {
+        av_freep(&stereo);
+        return AVERROR(ENOMEM);
+    }
+    st->side_data = tmp;
+    st->nb_side_data++;
+
+    sd = &st->side_data[st->nb_side_data - 1];
+    sd->type = AV_PKT_DATA_STEREO3D;
+    sd->data = (uint8_t *)stereo;
+    sd->size = sizeof(*stereo);
+
+    // note: the missing breaks are intentional
+    switch (stereo_mode) {
+    case MATROSKA_VIDEO_STEREOMODE_TYPE_MONO:
+        stereo->type = AV_STEREO3D_2D;
+        break;
+    case MATROSKA_VIDEO_STEREOMODE_TYPE_RIGHT_LEFT:
+        stereo->flags |= AV_STEREO3D_FLAG_INVERT;
+    case MATROSKA_VIDEO_STEREOMODE_TYPE_LEFT_RIGHT:
+        stereo->type = AV_STEREO3D_SIDEBYSIDE;
+        break;
+    case MATROSKA_VIDEO_STEREOMODE_TYPE_BOTTOM_TOP:
+        stereo->flags |= AV_STEREO3D_FLAG_INVERT;
+    case MATROSKA_VIDEO_STEREOMODE_TYPE_TOP_BOTTOM:
+        stereo->type = AV_STEREO3D_TOPBOTTOM;
+        break;
+    case MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_RL:
+        stereo->flags |= AV_STEREO3D_FLAG_INVERT;
+    case MATROSKA_VIDEO_STEREOMODE_TYPE_CHECKERBOARD_LR:
+        stereo->type = AV_STEREO3D_CHECKERBOARD;
+        break;
+    case MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_RL:
+        stereo->flags |= AV_STEREO3D_FLAG_INVERT;
+    case MATROSKA_VIDEO_STEREOMODE_TYPE_ROW_INTERLEAVED_LR:
+        stereo->type = AV_STEREO3D_LINES;
+        break;
+    case MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_RL:
+        stereo->flags |= AV_STEREO3D_FLAG_INVERT;
+    case MATROSKA_VIDEO_STEREOMODE_TYPE_COL_INTERLEAVED_LR:
+        stereo->type = AV_STEREO3D_COLUMNS;
+        break;
+    case MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_RL:
+        stereo->flags |= AV_STEREO3D_FLAG_INVERT;
+    case MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_LR:
+        stereo->type = AV_STEREO3D_FRAMESEQUENCE;
+        break;
+    }
+
+    return 0;
+}
diff --git a/libavformat/matroska.h b/libavformat/matroska.h
index 667f92a720..d8f4f8ebec 100644
--- a/libavformat/matroska.h
+++ b/libavformat/matroska.h
@@ -237,6 +237,7 @@ typedef enum {
   MATROSKA_VIDEO_STEREOMODE_TYPE_ANAGLYPH_GREEN_MAG = 12,
   MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_LR = 13,
   MATROSKA_VIDEO_STEREOMODE_TYPE_BOTH_EYES_BLOCK_RL = 14,
+  MATROSKA_VIDEO_STEREOMODE_TYPE_NB,
 } MatroskaVideoStereoModeType;
 
 /*
@@ -255,4 +256,6 @@ extern const CodecTags ff_mkv_codec_tags[];
 extern const CodecMime ff_mkv_mime_tags[];
 extern const AVMetadataConv ff_mkv_metadata_conv[];
 
+int ff_mkv_stereo3d_conv(AVStream *st, MatroskaVideoStereoModeType stereo_mode);
+
 #endif /* AVFORMAT_MATROSKA_H */
diff --git a/libavformat/matroskadec.c b/libavformat/matroskadec.c
index 431fe57348..59fc34b142 100644
--- a/libavformat/matroskadec.c
+++ b/libavformat/matroskadec.c
@@ -123,6 +123,7 @@ typedef struct {
     uint64_t pixel_width;
     uint64_t pixel_height;
     uint64_t fourcc;
+    uint64_t stereo_mode;
 } MatroskaTrackVideo;
 
 typedef struct {
@@ -319,7 +320,7 @@ static EbmlSyntax matroska_track_video[] = {
     { MATROSKA_ID_VIDEOPIXELCROPR,     EBML_NONE },
     { MATROSKA_ID_VIDEODISPLAYUNIT,    EBML_NONE },
     { MATROSKA_ID_VIDEOFLAGINTERLACED, EBML_NONE },
-    { MATROSKA_ID_VIDEOSTEREOMODE,     EBML_NONE },
+    { MATROSKA_ID_VIDEOSTEREOMODE,     EBML_UINT,  0, offsetof(MatroskaTrackVideo, stereo_mode), { .u = MATROSKA_VIDEO_STEREOMODE_TYPE_NB } },
     { MATROSKA_ID_VIDEOASPECTRATIO,    EBML_NONE },
     { 0 }
 };
@@ -1786,6 +1787,13 @@ static int matroska_parse_tracks(AVFormatContext *s)
                 av_reduce(&st->avg_frame_rate.num, &st->avg_frame_rate.den,
                           1000000000, track->default_duration, 30000);
             }
+            // add stream level stereo3d side data if it is a supported format
+            if (track->video.stereo_mode < MATROSKA_VIDEO_STEREOMODE_TYPE_NB &&
+                track->video.stereo_mode != 10 && track->video.stereo_mode != 12) {
+                int ret = ff_mkv_stereo3d_conv(st, track->video.stereo_mode);
+                if (ret < 0)
+                    return ret;
+            }
         } else if (track->type == MATROSKA_TRACK_TYPE_AUDIO) {
             st->codec->codec_type  = AVMEDIA_TYPE_AUDIO;
             st->codec->sample_rate = track->audio.out_samplerate;
@@ -1821,7 +1829,7 @@ static int matroska_read_header(AVFormatContext *s)
         ebml.version         > EBML_VERSION      ||
         ebml.max_size        > sizeof(uint64_t)  ||
         ebml.id_length       > sizeof(uint32_t)  ||
-        ebml.doctype_version > 2) {
+        ebml.doctype_version > 3) {
         av_log(matroska->ctx, AV_LOG_ERROR,
                "EBML header using unsupported features\n"
                "(EBML version %"PRIu64", doctype %s, doc version %"PRIu64")\n",