frodovdr/vdr-plugin-softhddevice
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Find AC3 (Dolby Digital) inside PES packet.

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This commit is contained in:
Johns 2012-02-14 21:18:24 +01:00
parent 4331692ee5
commit 919428cb80
2 changed files with 99 additions and 4 deletions
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1
ChangeLog
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@ -1,5 +1,6 @@
User johns
Find AC3 (Dolby Digital) inside PES packet.
Fix bug: audio increments invalid audio PTS.
Fix bug: dvd plugin not working.
Fix bug: used frame-> instead of video_ctx-> for old libav/ffmpeg.

102
softhddev.c
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@ -193,6 +193,89 @@ static int FindAudioSync(const AVPacket * avpkt)
return -1;
}
/**
** Possible AC3 frame sizes.
**
** from ATSC A/52 table 5.18 frame size code table.
*/
const uint16_t Ac3FrameSizeTable[38][3] = {
{64, 69, 96},
{64, 70, 96},
{80, 87, 120},
{80, 88, 120},
{96, 104, 144},
{96, 105, 144},
{112, 121, 168},
{112, 122, 168},
{128, 139, 192},
{128, 140, 192},
{160, 174, 240},
{160, 175, 240},
{192, 208, 288},
{192, 209, 288},
{224, 243, 336},
{224, 244, 336},
{256, 278, 384},
{256, 279, 384},
{320, 348, 480},
{320, 349, 480},
{384, 417, 576},
{384, 418, 576},
{448, 487, 672},
{448, 488, 672},
{512, 557, 768},
{512, 558, 768},
{640, 696, 960},
{640, 697, 960},
{768, 835, 1152},
{768, 836, 1152},
{896, 975, 1344},
{896, 976, 1344},
{1024, 1114, 1536},
{1024, 1115, 1536},
{1152, 1253, 1728},
{1152, 1254, 1728},
{1280, 1393, 1920},
{1280, 1394, 1920},
};
/**
** Find dolby sync in audio packet.
**
** @param avpkt audio packet
*/
static int FindDolbySync(const AVPacket * avpkt)
{
int i;
const uint8_t *data;
i = 0;
data = avpkt->data;
while (i < avpkt->size - 5) {
if (data[i] == 0x0B && data[i + 1] == 0x77) {
int fscod;
int frmsizcod;
int frame_size;
// crc1 crc1 fscod|frmsizcod
fscod = data[i + 4] >> 6;
frmsizcod = data[i + 4] & 0x3F;
frame_size = Ac3FrameSizeTable[frmsizcod][fscod] * 2;
// check if after this frame a new ac-3 frame starts
if (i + frame_size < avpkt->size - 5
&& data[i + frame_size] == 0x0B
&& data[i + frame_size + 1] == 0x77) {
Debug(3, "audio: ac-3 found at %d\n", i);
return i;
}
// no valid frame size or no continuation, try next
}
i++;
}
return -1;
}
/**
** Play audio packet.
**
@ -297,6 +380,9 @@ int PlayAudio(const uint8_t * data, int size, uint8_t id)
AudioCodecID = CODEC_ID_AAC_LATM;
}
// Private stream + LPCM ID
} else if (data[-n - 9 + 3] == 0xBD && data[0] == 0x80) {
Debug(3, "[softhddev]%s: DVD Audio %d\n", __FUNCTION__, id);
// Private stream + LPCM ID
} else if (data[-n - 9 + 3] == 0xBD && data[0] == 0xA0) {
if (AudioCodecID != CODEC_ID_PCM_DVD) {
static int samplerates[] = { 48000, 96000, 44100, 32000 };
@ -338,19 +424,27 @@ int PlayAudio(const uint8_t * data, int size, uint8_t id)
// FIXME: otherwise it takes too long until sound appears
if (AudioCodecID == CODEC_ID_NONE) {
int id;
Debug(3, "[softhddev]%s: ??? %d\n", __FUNCTION__, id);
avpkt->data = (void *)data;
avpkt->size = size;
n = FindAudioSync(avpkt);
if (AudioChannelID == 0xBD) {
n = FindDolbySync(avpkt);
id = CODEC_ID_AC3;
} else {
n = FindAudioSync(avpkt);
id = CODEC_ID_MP2;
}
if (n < 0) {
return osize;
}
avpkt->pts = AV_NOPTS_VALUE;
CodecAudioOpen(MyAudioDecoder, NULL, CODEC_ID_MP2);
AudioCodecID = CODEC_ID_MP2;
CodecAudioOpen(MyAudioDecoder, NULL, id);
AudioCodecID = id;
data += n;
size -= n;
avpkt->pts = AV_NOPTS_VALUE;
}
}
// still no decoder or codec known