void buffer_sig(int signal, int block)
{
#ifndef NOXFERMEM
kill(buffer_pid, signal);
if (!buffermem || !block)
return;
if(xfermem_block(XF_WRITER, buffermem) != XF_CMD_WAKEUP)
perror("Could not resync/reset buffers");
#endif
return;
}
/*
* Change the playback sample rate.
* Consider that changing it after starting playback is not covered by gapless code!
*/
static void reset_audio(long rate, int channels, int format)
{
#ifndef NOXFERMEM
if (param.usebuffer) {
/* wait until the buffer is empty,
* then tell the buffer process to
* change the sample rate. [OF]
*/
while (xfermem_get_usedspace(buffermem) > 0)
if (xfermem_block(XF_WRITER, buffermem) == XF_CMD_TERMINATE) {
intflag = TRUE;
break;
}
buffermem->freeindex = -1;
buffermem->readindex = 0; /* I know what I'm doing! ;-) */
buffermem->freeindex = 0;
if (intflag)
return;
buffermem->rate = pitch_rate(rate);
buffermem->channels = channels;
buffermem->format = format;
buffer_reset();
}
else
{
#endif
if(ao == NULL)
{
error("Audio handle should not be NULL here!");
safe_exit(98);
}
ao->rate = pitch_rate(rate);
ao->channels = channels;
ao->format = format;
if(reset_output(ao) < 0)
{
error1("failed to reset audio device: %s", strerror(errno));
safe_exit(1);
}
#ifndef NOXFERMEM
}
#endif
}
void buffer_loop(audio_output_t *ao, sigset_t *oldsigset)
{
int bytes, outbytes;
int my_fd = buffermem->fd[XF_READER];
txfermem *xf = buffermem;
int done = FALSE;
int preload;
catchsignal (SIGINT, catch_interrupt);
catchsignal (SIGUSR1, catch_usr1);
sigprocmask (SIG_SETMASK, oldsigset, NULL);
xfermem_putcmd(my_fd, XF_CMD_WAKEUP);
debug("audio output: waiting for cap requests");
/* wait for audio setup queries */
while(1)
{
int cmd;
cmd = xfermem_block(XF_READER, xf);
if(cmd == XF_CMD_AUDIOCAP)
{
ao->rate = xf->rate;
ao->channels = xf->channels;
ao->format = ao->get_formats(ao);
debug3("formats for %liHz/%ich: 0x%x", ao->rate, ao->channels, ao->format);
xf->format = ao->format;
xfermem_putcmd(my_fd, XF_CMD_AUDIOCAP);
}
else if(cmd == XF_CMD_WAKEUP)
{
debug("got wakeup... leaving config mode");
xfermem_putcmd(buffermem->fd[XF_READER], XF_CMD_WAKEUP);
break;
}
else
{
error1("unexpected command %i", cmd);
return;
}
}
/* Fill complete buffer on first run before starting to play.
* Live mp3 streams constantly approach buffer underrun otherwise. [dk]
*/
preload = (int)(param.preload*xf->size);
if(preload > xf->size) preload = xf->size;
if(preload < 0) preload = 0;
for (;;) {
if (intflag) {
debug("handle intflag... flushing");
intflag = FALSE;
ao->flush(ao);
/* Either prepare for waiting or empty buffer now. */
if(!xf->justwait) xf->readindex = xf->freeindex;
else
{
int cmd;
debug("Prepare for waiting; draining command queue. (There's a lot of wakeup commands pending, usually.)");
do
{
cmd = xfermem_getcmd(my_fd, FALSE);
/* debug1("drain: %i", cmd); */
} while(cmd > 0);
}
if(xf->wakeme[XF_WRITER]) xfermem_putcmd(my_fd, XF_CMD_WAKEUP);
}
if (usr1flag) {
debug("handling usr1flag");
usr1flag = FALSE;
/* close and re-open in order to flush
* the device's internal buffer before
* changing the sample rate. [OF]
*/
/* writer must block when sending SIGUSR1
* or we will lose all data processed
* in the meantime! [dk]
*/
xf->readindex = xf->freeindex;
/* We've nailed down the new starting location -
* writer is now safe to go on. [dk]
*/
if (xf->wakeme[XF_WRITER])
xfermem_putcmd(my_fd, XF_CMD_WAKEUP);
ao->rate = xf->rate;
ao->channels = xf->channels;
ao->format = xf->format;
if (reset_output(ao) < 0) {
error1("failed to reset audio: %s", strerror(errno));
exit(1);
}
}
if ( (bytes = xfermem_get_usedspace(xf)) < outburst ) {
/* if we got a buffer underrun we first
* fill 1/8 of the buffer before continue/start
* playing */
if (preload < xf->size>>3)
preload = xf->size>>3;
if(preload < outburst)
preload = outburst;
}
debug1("bytes: %i", bytes);
if(xf->justwait || bytes < preload) {
int cmd;
if (done && !bytes) {
break;
}
if(xf->justwait || !done) {
/* Don't spill into errno check below. */
errno = 0;
cmd = xfermem_block(XF_READER, xf);
debug1("got %i", cmd);
switch(cmd) {
/* More input pending. */
case XF_CMD_WAKEUP_INFO:
continue;
/* Yes, we know buffer is low but
* know we don't care.
*/
case XF_CMD_WAKEUP:
break; /* Proceed playing. */
case XF_CMD_ABORT: /* Immediate end, discard buffer contents. */
return; /* Cleanup happens outside of buffer_loop()*/
case XF_CMD_TERMINATE: /* Graceful end, playing stuff in buffer and then return. */
debug("going to terminate");
done = TRUE;
break;
case XF_CMD_RESYNC:
debug("ordered resync");
if (param.outmode == DECODE_AUDIO) ao->flush(ao);
xf->readindex = xf->freeindex;
if (xf->wakeme[XF_WRITER]) xfermem_putcmd(my_fd, XF_CMD_WAKEUP);
continue;
break;
case -1:
if(intflag || usr1flag) /* Got signal, handle it at top of loop... */
{
debug("buffer interrupted");
continue;
}
if(errno)
error1("Yuck! Error in buffer handling... or somewhere unexpected: %s", strerror(errno));
done = TRUE;
xf->readindex = xf->freeindex;
xfermem_putcmd(xf->fd[XF_READER], XF_CMD_TERMINATE);
break;
default:
fprintf(stderr, "\nEh!? Received unknown command 0x%x in buffer process.\n", cmd);
}
}
}
/* Hack! The writer issues XF_CMD_WAKEUP when first adjust
* audio settings. We do not want to lower the preload mark
* just yet!
*/
if (xf->justwait || !bytes)
continue;
preload = outburst; /* set preload to lower mark */
if (bytes > xf->size - xf->readindex)
bytes = xf->size - xf->readindex;
if (bytes > outburst)
bytes = outburst;
/* The output can only take multiples of framesize. */
bytes -= bytes % ao->framesize;
debug("write");
outbytes = flush_output(ao, (unsigned char*) xf->data + xf->readindex, bytes);
if(outbytes < bytes)
{
if(outbytes < 0) outbytes = 0;
if(!intflag && !usr1flag) {
error1("Ouch ... error while writing audio data: %s", strerror(errno));
/*
* done==TRUE tells writer process to stop
* sending data. There might be some latency
* involved when resetting readindex to
* freeindex so we might need more than one
* cycle to terminate. (The number of cycles
* should be finite unless I managed to mess
* up something. ;-) [dk]
*/
done = TRUE;
xf->readindex = xf->freeindex;
xfermem_putcmd(xf->fd[XF_READER], XF_CMD_TERMINATE);
}
else debug("buffer interrupted");
}
bytes = outbytes;
xf->readindex = (xf->readindex + bytes) % xf->size;
if (xf->wakeme[XF_WRITER])
xfermem_putcmd(my_fd, XF_CMD_WAKEUP);
}
}
void buffer_loop(struct audio_info_struct *ai, sigset_t *oldsigset)
{
int bytes;
int my_fd = buffermem->fd[XF_READER];
txfermem *xf = buffermem;
int done = FALSE;
catchsignal (SIGINT, catch_interrupt);
catchsignal (SIGUSR1, catch_usr1);
sigprocmask (SIG_SETMASK, oldsigset, NULL);
#ifndef NO_DECODE_AUDIO
if (param.outmode == DECODE_AUDIO) {
if (audio_open(ai) < 0) {
perror("audio");
exit(1);
}
}
#endif
for (;;) {
if (intflag) {
intflag = FALSE;
#ifndef NO_DECODE_AUDIO
if (param.outmode == DECODE_AUDIO)
audio_queueflush (ai);
#endif
xf->readindex = xf->freeindex;
if (xf->wakeme[XF_WRITER])
xfermem_putcmd(my_fd, XF_CMD_WAKEUP);
}
if (usr1flag) {
usr1flag = FALSE;
/* close and re-open in order to flush
* the device's internal buffer before
* changing the sample rate. [OF]
*/
/* writer must block when sending SIGUSR1
* or we will lose all data processed
* in the meantime! [dk]
*/
xf->readindex = xf->freeindex;
/* We've nailed down the new starting location -
* writer is now safe to go on. [dk]
*/
if (xf->wakeme[XF_WRITER])
xfermem_putcmd(my_fd, XF_CMD_WAKEUP);
#ifndef NO_DECODE_AUDIO
if (param.outmode == DECODE_AUDIO) {
audio_close (ai);
ai->rate = xf->buf[0];
ai->channels = xf->buf[1];
ai->format = xf->buf[2];
if (audio_open(ai) < 0) {
sleep(1);
/* give em a 2. try */
if (audio_open(ai) < 0) {
perror("audio");
exit(1);
}
}
}
#endif
}
if ( (bytes = xfermem_get_usedspace(xf)) < outburst ) {
/* if we got a buffer underrun we first
* fill 1/8 of the buffer before continue/start
* playing */
preload = xf->size>>3;
if(preload < outburst)
preload = outburst;
}
if(bytes < preload) {
int cmd;
if (done && !bytes) {
break;
}
if(!done) {
cmd = xfermem_block(XF_READER, xf);
switch(cmd) {
/* More input pending. */
case XF_CMD_WAKEUP_INFO:
continue;
/* Yes, we know buffer is low but
* know we don't care.
*/
case XF_CMD_WAKEUP:
break; /* Proceed playing. */
case XF_CMD_TERMINATE:
/* Proceed playing without
* blocking any further.
*/
done=TRUE;
break;
case -1:
if(errno==EINTR)
continue;
perror("Yuck! Error in buffer handling...");
done = TRUE;
xf->readindex = xf->freeindex;
xfermem_putcmd(xf->fd[XF_READER], XF_CMD_TERMINATE);
break;
default:
fprintf(stderr, "\nEh!? Received unknown command 0x%x in buffer process. Tell Daniel!\n", cmd);
}
}
}
preload = outburst; /* set preload to lower mark */
if (bytes > xf->size - xf->readindex)
bytes = xf->size - xf->readindex;
if (bytes > outburst)
bytes = outburst;
if (param.outmode == DECODE_FILE)
bytes = write(OutputDescriptor, xf->data + xf->readindex, bytes);
#ifndef NO_DECODE_AUDIO
else if (param.outmode == DECODE_AUDIO)
bytes = audio_play_samples(ai,
(unsigned char *) (xf->data + xf->readindex), bytes);
#endif
if(bytes < 0) {
bytes = 0;
if(errno != EINTR) {
perror("Ouch ... error while writing audio data: ");
/*
* done==TRUE tells writer process to stop
* sending data. There might be some latency
* involved when resetting readindex to
* freeindex so we might need more than one
* cycle to terminate. (The number of cycles
* should be finite unless I managed to mess
* up something. ;-) [dk]
*/
done = TRUE;
xf->readindex = xf->freeindex;
xfermem_putcmd(xf->fd[XF_READER], XF_CMD_TERMINATE);
}
}
xf->readindex = (xf->readindex + bytes) % xf->size;
if (xf->wakeme[XF_WRITER])
xfermem_putcmd(my_fd, XF_CMD_WAKEUP);
}