avformat/matroska: Add support for A_ATRAC/AT1

Signed-off-by: asivery <asivery@protonmail.com>
Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>

libavformat/matroska.c

@@ -28,6 +28,7 @@ const CodecTags ff_mkv_codec_tags[]={
     {"A_AAC"            , AV_CODEC_ID_AAC},
     {"A_AC3"            , AV_CODEC_ID_AC3},
     {"A_ALAC"           , AV_CODEC_ID_ALAC},
+    {"A_ATRAC/AT1"      , AV_CODEC_ID_ATRAC1},
     {"A_DTS"            , AV_CODEC_ID_DTS},
     {"A_EAC3"           , AV_CODEC_ID_EAC3},
     {"A_FLAC"           , AV_CODEC_ID_FLAC},

libavformat/matroskadec.c

@@ -2779,6 +2779,14 @@ static int mka_parse_audio_codec(MatroskaTrack *track, AVCodecParameters *par,
             return AVERROR(ENOMEM);
         break;
     }
+    case AV_CODEC_ID_ATRAC1:
+        /* ATRAC1 uses a constant frame size.
+         * Typical ATRAC1 streams are either mono or stereo.
+         * At most, ATRAC1 was used to store 8 channels of audio. */
+        if (track->audio.channels > 8)
+            return AVERROR_INVALIDDATA;
+        par->block_align = track->audio.channels * 212;
+        break;
     case AV_CODEC_ID_FLAC:
         if (track->codec_priv.size) {
             ret = matroska_parse_flac(s, track, extradata_offset);

libavformat/matroskaenc.c

@@ -3474,6 +3474,7 @@ static int mkv_check_bitstream(AVFormatContext *s, AVStream *st,
 
 static const AVCodecTag additional_audio_tags[] = {
     { AV_CODEC_ID_ALAC,      0XFFFFFFFF },
+    { AV_CODEC_ID_ATRAC1,    0xFFFFFFFF },
     { AV_CODEC_ID_MLP,       0xFFFFFFFF },
     { AV_CODEC_ID_OPUS,      0xFFFFFFFF },
     { AV_CODEC_ID_PCM_S16BE, 0xFFFFFFFF },