demux_mkv: support embedded coverart

The code could as well be in demux.c, but it's better to avoid
accidental clashes with demux_lavf.c.

FFmpeg provides no way yet to map a mime type to a codec, so do it
manually. (It _can_ map a mime type to an "input format", but not a
codec.)

Fixes #1374.

1 files changed, 17 insertions, 0 deletions

diff --git a/demux/codec_tags.c b/demux/codec_tags.c
index ba99380b67..fd95f83363 100644
--- a/demux/codec_tags.c
+++ b/demux/codec_tags.c
@@ -141,3 +141,20 @@ void mp_set_pcm_codec(struct sh_stream *sh, bool sign, bool is_float, int bits,
         mp_snprintf_cat(codec, sizeof(codec), is_be ? "be" : "le");
     sh->codec = talloc_strdup(sh->audio, codec);
 }
+
+static const char *const mimetype_to_codec[][2] = {
+    {"image/jpeg",      "mjpeg"},
+    {"image/png",       "png"},
+    {0}
+};
+
+const char *mp_map_mimetype_to_video_codec(const char *mimetype)
+{
+    if (mimetype) {
+        for (int n = 0; mimetype_to_codec[n][0]; n++) {
+            if (strcmp(mimetype_to_codec[n][0], mimetype) == 0)
+                return mimetype_to_codec[n][1];
+        }
+    }
+    return NULL;
+}