avformat/mov: add demuxing support for Dolby TrueHD streams

Signed-off-by: James Almer <jamrial@gmail.com>

Changelog

@@ -5,6 +5,8 @@ version <next>:
 - v360 filter
 - Intel QSV-accelerated MJPEG decoding
 - Intel QSV-accelerated VP9 decoding
+- support for TrueHD in mp4
+
 
 version 4.2:
 - tpad filter

libavformat/isom.c

@@ -369,6 +369,7 @@ const AVCodecTag ff_codec_movaudio_tags[] = {
     { AV_CODEC_ID_EVRC,            MKTAG('s', 'e', 'v', 'c') }, /* 3GPP2 */
     { AV_CODEC_ID_SMV,             MKTAG('s', 's', 'm', 'v') }, /* 3GPP2 */
     { AV_CODEC_ID_FLAC,            MKTAG('f', 'L', 'a', 'C') }, /* nonstandard */
+    { AV_CODEC_ID_TRUEHD,          MKTAG('m', 'l', 'p', 'a') }, /* mp4ra.org */
     { AV_CODEC_ID_OPUS,            MKTAG('O', 'p', 'u', 's') }, /* mp4ra.org */
     { AV_CODEC_ID_NONE, 0 },
 };

libavformat/mov.c

@@ -49,6 +49,7 @@
 #include "libavcodec/ac3tab.h"
 #include "libavcodec/flac.h"
 #include "libavcodec/mpegaudiodecheader.h"
+#include "libavcodec/mlp_parse.h"
 #include "avformat.h"
 #include "internal.h"
 #include "avio_internal.h"
@@ -6683,6 +6684,38 @@ static int mov_read_dops(MOVContext *c, AVIOContext *pb, MOVAtom atom)
     return 0;
 }
 
+static int mov_read_dmlp(MOVContext *c, AVIOContext *pb, MOVAtom atom)
+{
+    AVStream *st;
+    unsigned format_info;
+    int channel_assignment, channel_assignment1, channel_assignment2;
+    int ratebits;
+
+    if (c->fc->nb_streams < 1)
+        return 0;
+    st = c->fc->streams[c->fc->nb_streams-1];
+
+    if (atom.size < 10)
+        return AVERROR_INVALIDDATA;
+
+    format_info = avio_rb32(pb);
+
+    ratebits            = (format_info >> 28) & 0xF;
+    channel_assignment1 = (format_info >> 15) & 0x1F;
+    channel_assignment2 = format_info & 0x1FFF;
+    if (channel_assignment2)
+        channel_assignment = channel_assignment2;
+    else
+        channel_assignment = channel_assignment1;
+
+    st->codecpar->frame_size = 40 << (ratebits & 0x7);
+    st->codecpar->sample_rate = mlp_samplerate(ratebits);
+    st->codecpar->channels = truehd_channels(channel_assignment);
+    st->codecpar->channel_layout = truehd_layout(channel_assignment);
+
+    return 0;
+}
+
 static const MOVParseTableEntry mov_default_parse_table[] = {
 { MKTAG('A','C','L','R'), mov_read_aclr },
 { MKTAG('A','P','R','G'), mov_read_avid },
@@ -6771,6 +6804,7 @@ static const MOVParseTableEntry mov_default_parse_table[] = {
 { MKTAG('s','t','3','d'), mov_read_st3d }, /* stereoscopic 3D video box */
 { MKTAG('s','v','3','d'), mov_read_sv3d }, /* spherical video box */
 { MKTAG('d','O','p','s'), mov_read_dops },
+{ MKTAG('d','m','l','p'), mov_read_dmlp },
 { MKTAG('S','m','D','m'), mov_read_smdm },
 { MKTAG('C','o','L','L'), mov_read_coll },
 { MKTAG('v','p','c','C'), mov_read_vpcc },

libavformat/version.h

@@ -33,7 +33,7 @@
 // Also please add any ticket numbers that you believe might be affected here
 #define LIBAVFORMAT_VERSION_MAJOR  58
 #define LIBAVFORMAT_VERSION_MINOR  31
-#define LIBAVFORMAT_VERSION_MICRO 102
+#define LIBAVFORMAT_VERSION_MICRO 103
 
 #define LIBAVFORMAT_VERSION_INT AV_VERSION_INT(LIBAVFORMAT_VERSION_MAJOR, \
                                                LIBAVFORMAT_VERSION_MINOR, \