TTA support on the matroska demuxer

Code from libavformat's demuxer.

libmpdemux/demux_mkv.c

@@ -59,6 +59,7 @@
 #include "libavutil/lzo.h"
 #include "ffmpeg_files/intreadwrite.h"
 #include "libavutil/avstring.h"
+#include "libavformat/avformat.h"
 
 static const unsigned char sipr_swaps[38][2] = {
     {0,63},{1,22},{2,44},{3,90},{5,81},{7,31},{8,86},{9,58},{10,36},{12,68},
@@ -1353,6 +1354,8 @@ static int demux_mkv_open_audio(demuxer_t *demuxer, mkv_track_t *track,
             track->a_formattag = mmioFOURCC('Q', 'D', 'M', 'C');
         else if (!strcmp(track->codec_id, MKV_A_QDMC2))
             track->a_formattag = mmioFOURCC('Q', 'D', 'M', '2');
+        else if (!strcmp(track->codec_id, MKV_A_TTA1))
+            track->a_formattag = mmioFOURCC('T', 'T', 'A', '1');
         else if (!strcmp(track->codec_id, MKV_A_WAVPACK))
             track->a_formattag = mmioFOURCC('W', 'V', 'P', 'K');
         else if (!strcmp(track->codec_id, MKV_A_TRUEHD))
@@ -1562,6 +1565,22 @@ static int demux_mkv_open_audio(demuxer_t *demuxer, mkv_track_t *track,
             sh_a->codecdata_len = size;
             memcpy(sh_a->codecdata, ptr, size);
         }
+    } else if (track->a_formattag == mmioFOURCC('T', 'T', 'A', '1')) {
+        sh_a->codecdata_len = 30;
+        sh_a->codecdata = av_mallocz(sh_a->codecdata_len);
+        if (! sh_a->codecdata) {
+            free_sh_audio(demuxer, track->tnum);
+            return 1;
+        }
+        ByteIOContext b;
+        init_put_byte(&b, sh_a->codecdata, sh_a->codecdata_len, 1,
+                NULL, NULL, NULL, NULL);
+        put_buffer(&b, "TTA1", 4);
+        put_le16(&b, 1);
+        put_le16(&b, sh_a->channels);
+        put_le16(&b, sh_a->wf->wBitsPerSample);
+        put_le32(&b, sh_a->samplerate);
+        put_le32(&b, (demuxer->movi_end - demuxer->movi_start) * sh_a->samplerate);
     } else if (track->a_formattag == mmioFOURCC('W', 'V', 'P', 'K') || track->a_formattag == mmioFOURCC('T', 'R', 'H', 'D')) {  /* do nothing, still works */
     } else if (!track->ms_compat
                || (track->private_size < sizeof(WAVEFORMATEX))) {

libmpdemux/matroska.h

@@ -49,6 +49,7 @@
 #define MKV_A_QDMC       "A_QUICKTIME/QDMC"
 #define MKV_A_QDMC2      "A_QUICKTIME/QDM2"
 #define MKV_A_FLAC       "A_FLAC"
+#define MKV_A_TTA1       "A_TTA1"
 #define MKV_A_WAVPACK    "A_WAVPACK4"
 #define MKV_A_TRUEHD     "A_TRUEHD"