mp4: Handle non-trivial ES Descriptors.

libavformat/isom.c

@@ -372,6 +372,22 @@ int ff_mp4_read_descr(AVFormatContext *fc, AVIOContext *pb, int *tag)
     return len;
 }
 
+void ff_mp4_parse_es_descr(AVIOContext *pb, int *es_id)
+{
+     int flags;
+     if (es_id) *es_id = avio_rb16(pb);
+     else                avio_rb16(pb);
+     flags = avio_r8(pb);
+     if (flags & 0x80) //streamDependenceFlag
+         avio_rb16(pb);
+     if (flags & 0x40) { //URL_Flag
+         int len = avio_r8(pb);
+         avio_skip(pb, len);
+     }
+     if (flags & 0x20) //OCRstreamFlag
+         avio_rb16(pb);
+}
+
 static const AVCodecTag mp4_audio_types[] = {
     { CODEC_ID_MP3ON4, AOT_PS   }, /* old mp3on4 draft */
     { CODEC_ID_MP3ON4, AOT_L1   }, /* layer 1 */

libavformat/isom.h

@@ -146,6 +146,7 @@ typedef struct MOVContext {
 int ff_mp4_read_descr_len(AVIOContext *pb);
 int ff_mp4_read_descr(AVFormatContext *fc, AVIOContext *pb, int *tag);
 int ff_mp4_read_dec_config_descr(AVFormatContext *fc, AVStream *st, AVIOContext *pb);
+void ff_mp4_parse_es_descr(AVIOContext *pb, int *es_id);
 
 #define MP4IODescrTag                   0x02
 #define MP4ESDescrTag                   0x03

libavformat/mov.c

@@ -473,8 +473,7 @@ int ff_mov_read_esds(AVFormatContext *fc, AVIOContext *pb, MOVAtom atom)
     avio_rb32(pb); /* version + flags */
     ff_mp4_read_descr(fc, pb, &tag);
     if (tag == MP4ESDescrTag) {
-        avio_rb16(pb); /* ID */
-        avio_r8(pb); /* priority */
+        ff_mp4_parse_es_descr(pb, NULL);
     } else
         avio_rb16(pb); /* ID */
 

libavformat/mpegts.c

@@ -886,9 +886,8 @@ static int mp4_read_iods(AVFormatContext *s, const uint8_t *buf, unsigned size,
         avio_r8(&pb);
         len = ff_mp4_read_descr(s, &pb, &tag);
         if (tag == MP4ESDescrTag) {
-            *es_id = avio_rb16(&pb); /* ES_ID */
+            ff_mp4_parse_es_descr(&pb, es_id);
             av_dlog(s, "ES_ID %#x\n", *es_id);
-            avio_r8(&pb); /* priority */
             len = ff_mp4_read_descr(s, &pb, &tag);
             if (tag == MP4DecConfigDescrTag) {
                 *dec_config_descr = av_malloc(len);