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libtriple: implement PCM playback in cAudio()

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This commit is contained in:
Stefan Seyfried
2011-02-05 16:02:34 +01:00
parent b0b348e4d1
commit ddf592f805
2 changed files with 54 additions and 5 deletions
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57
libtriple/audio_td.cpp
View File

@@ -10,11 +10,14 @@
#include "audio_td.h"
#include "lt_debug.h"
#include <linux/soundcard.h>
cAudio * audioDecoder = NULL;
cAudio::cAudio(void *, void *, void *)
{
fd = -1;
clipfd = -1;
openDevice();
Muted = false;
}
@@ -40,6 +43,9 @@ void cAudio::closeDevice(void)
if (fd >= 0)
close(fd);
fd = -1;
if (clipfd >= 0)
close(clipfd);
clipfd = -1;
}
int cAudio::do_mute(bool enable, bool remember)
@@ -152,21 +158,62 @@ int cAudio::setChannel(int /*channel*/)
return 0;
};
int cAudio::PrepareClipPlay(int /*uNoOfChannels*/, int /*uSampleRate*/, int /*uBitsPerSample*/, int /*bLittleEndian*/)
int cAudio::PrepareClipPlay(int ch, int srate, int bits, int little_endian)
{
lt_debug("cAudio::%s\n", __FUNCTION__);
int fmt;
lt_debug("cAudio::%s ch %d srate %d bits %d le %d\n", __FUNCTION__, ch, srate, bits, little_endian);
if (clipfd >= 0) {
fprintf(stderr, "cAudio::%s: clipfd already opened (%d)\n", __FUNCTION__, clipfd);
return -1;
}
/* the dsp driver seems to work only on the second open(). really. */
clipfd = open("/dev/sound/dsp", O_WRONLY);
close(clipfd);
clipfd = open("/dev/sound/dsp", O_WRONLY);
if (clipfd < 0) {
perror("cAudio::PrepareClipPlay open /dev/sound/dsp");
return -1;
}
/* no idea if we ever get little_endian == 0 */
if (little_endian)
fmt = AFMT_S16_BE;
else
fmt = AFMT_S16_LE;
if (ioctl(clipfd, SNDCTL_DSP_SETFMT, &fmt))
perror("SNDCTL_DSP_SETFMT");
if (ioctl(clipfd, SNDCTL_DSP_CHANNELS, &ch))
perror("SNDCTL_DSP_CHANNELS");
if (ioctl(clipfd, SNDCTL_DSP_SPEED, &srate))
perror("SNDCTL_DSP_SPEED");
if (ioctl(clipfd, SNDCTL_DSP_RESET))
perror("SNDCTL_DSP_RESET");
return 0;
};
int cAudio::WriteClip(unsigned char * /*buffer*/, int /*size*/)
int cAudio::WriteClip(unsigned char *buffer, int size)
{
lt_debug("cAudio::%s\n", __FUNCTION__);
return 0;
int ret;
// lt_debug("cAudio::%s\n", __FUNCTION__);
if (clipfd <= 0) {
fprintf(stderr, "cAudio::%s: clipfd not yet opened\n", __FUNCTION__);
return -1;
}
ret = write(clipfd, buffer, size);
if (ret < 0)
fprintf(stderr, "cAudio::%s: write error (%m)\n", __FUNCTION__);
return ret;
};
int cAudio::StopClip()
{
lt_debug("cAudio::%s\n", __FUNCTION__);
if (clipfd <= 0) {
fprintf(stderr, "cAudio::%s: clipfd not yet opened\n", __FUNCTION__);
return -1;
}
close(clipfd);
clipfd = -1;
return 0;
};

2
libtriple/audio_td.h
View File

@@ -36,6 +36,8 @@ class cAudio
int fd;
bool Muted;
int clipfd; /* for pcm playback */
AUDIO_FORMAT StreamType;
AUDIO_SYNC_MODE SyncMode;
bool started;