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Code Issues Releases Wiki Activity

Increase AudioBufferTime for OSS.

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This commit is contained in:
Johns 2012-03-01 17:50:57 +01:00
parent 3b4ace14cf
commit b5e9077c74
2 changed files with 59 additions and 52 deletions
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1
ChangeLog
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@ -1,6 +1,7 @@
User johns
Date:
OSS needs bigger audio buffers.
Improved audio drift correction support.
Experimental audio drift correction support.
Add SVDRP HOTK command support.

62
audio.c
View File

@ -1277,6 +1277,7 @@ static int OssPcmFildes = -1; ///< pcm file descriptor
static int OssMixerFildes = -1; ///< mixer file descriptor
static int OssMixerChannel; ///< mixer channel index
static RingBuffer *OssRingBuffer; ///< audio ring buffer
static int OssFragmentTime; ///< fragment time in ms
static unsigned OssStartThreshold; ///< start play, if filled
#ifdef USE_AUDIO_THREAD
@ -1366,7 +1367,7 @@ static int OssPlayRingbuffer(void)
Error(_("audio/oss: write error: %s\n"), strerror(errno));
return 1;
}
Error(_("audio/oss: error not all bytes written\n"));
Warning(_("audio/oss: error not all bytes written\n"));
}
// advance how many could written
RingBufferReadAdvance(OssRingBuffer, n);
@ -1479,10 +1480,10 @@ static void OssThread(void)
fds[0].fd = OssPcmFildes;
fds[0].events = POLLOUT | POLLERR;
// wait for space in kernel buffers
err = poll(fds, 1, 100);
err = poll(fds, 1, OssFragmentTime);
if (err < 0) {
Error(_("audio/oss: error poll %s\n"), strerror(errno));
usleep(100 * 1000);
usleep(OssFragmentTime * 1000);
continue;
}
@ -1495,7 +1496,7 @@ static void OssThread(void)
break;
}
pthread_yield();
usleep(20 * 1000); // let fill/empty the buffers
usleep(OssFragmentTime * 1000); // let fill/empty the buffers
}
}
}
@ -1685,18 +1686,14 @@ static uint64_t OssGetDelay(void)
strerror(errno));
return 0UL;
}
if (delay == -1) {
delay = 0UL;
if (delay < 0) {
delay = 0;
}
pts = ((uint64_t) delay * 90 * 1000)
pts = ((uint64_t) (delay + RingBufferUsedBytes(OssRingBuffer)) * 90 * 1000)
/ (AudioSampleRate * AudioChannels * AudioBytesProSample);
pts += ((uint64_t) RingBufferUsedBytes(OssRingBuffer) * 90 * 1000)
/ (AudioSampleRate * AudioChannels * AudioBytesProSample);
if (pts > 600 * 90) {
Debug(4, "audio/oss: hw+sw delay %zd %" PRId64 " ms\n",
RingBufferUsedBytes(OssRingBuffer), pts / 90);
}
return pts;
}
@ -1719,6 +1716,7 @@ static int OssSetup(int *freq, int *channels, int use_ac3)
int ret;
int tmp;
int delay;
audio_buf_info bi;
if (OssPcmFildes == -1) { // OSS not ready
return -1;
@ -1782,37 +1780,46 @@ static int OssSetup(int *freq, int *channels, int use_ac3)
// FIXME: setup buffers
if (1) {
audio_buf_info bi;
#ifdef SNDCTL_DSP_POLICY
tmp = 3;
if (ioctl(OssPcmFildes, SNDCTL_DSP_POLICY, &tmp) == -1) {
Error(_("audio/oss: ioctl(SNDCTL_DSP_POLICY): %s\n"), strerror(errno));
} else {
Info("audio/oss: set policy to %d\n", tmp);
}
#endif
if (ioctl(OssPcmFildes, SNDCTL_DSP_GETOSPACE, &bi) == -1) {
Error(_("audio/oss: ioctl(SNDCTL_DSP_GETOSPACE): %s\n"),
strerror(errno));
bi.fragsize = 4096;
bi.fragstotal = 16;
} else {
Debug(3, "audio/oss: %d bytes buffered\n", bi.bytes);
}
tmp = -1;
if (ioctl(OssPcmFildes, SNDCTL_DSP_GETODELAY, &tmp) == -1) {
Error(_("audio/oss: ioctl(SNDCTL_DSP_GETODELAY): %s\n"),
strerror(errno));
// FIXME: stop player, set setup failed flag
return -1;
}
if (tmp == -1) {
tmp = 0;
}
OssFragmentTime = (bi.fragsize * 1000)
/ (AudioSampleRate * AudioChannels * AudioBytesProSample);
Info(_("audio/oss: buffer size %d %dms, fragment size %d %dms\n"),
bi.fragsize * bi.fragstotal, (bi.fragsize * bi.fragstotal * 1000)
/ (AudioSampleRate * AudioChannels * AudioBytesProSample), bi.fragsize,
OssFragmentTime);
// start when enough bytes for initial write
OssStartThreshold = bi.bytes + tmp;
OssStartThreshold = (bi.fragsize - 1) * bi.fragstotal;
// buffer time/delay in ms
delay = AudioBufferTime;
delay = AudioBufferTime + 300;
if (VideoAudioDelay > 0) {
delay += VideoAudioDelay / 90;
}
if (OssStartThreshold <
(*freq * *channels * AudioBytesProSample * delay) / 1000U) {
(AudioSampleRate * AudioChannels * AudioBytesProSample * delay) /
1000U) {
OssStartThreshold =
(*freq * *channels * AudioBytesProSample * delay) / 1000U;
(AudioSampleRate * AudioChannels * AudioBytesProSample * delay) /
1000U;
}
// no bigger, than the buffer
if (OssStartThreshold > RingBufferFreeBytes(OssRingBuffer)) {
@ -1821,7 +1828,6 @@ static int OssSetup(int *freq, int *channels, int use_ac3)
Info(_("audio/oss: delay %u ms\n"), (OssStartThreshold * 1000)
/ (AudioSampleRate * AudioChannels * AudioBytesProSample));
}
return ret;
}