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/*
* buffer.c
*
* Oliver Fromme <oliver.fromme@heim3.tu-clausthal.de>
* Mon Apr 14 03:53:18 MET DST 1997
*/
#include <stdlib.h>
#include <errno.h>
#include "mpg123.h"
int outburst = MAXOUTBURST;
int preload;
static int intflag = FALSE;
static int usr1flag = FALSE;
static void catch_interrupt (void)
{
intflag = TRUE;
}
static void catch_usr1 (void)
{
usr1flag = TRUE;
}
/* Interfaces to writer process */
extern void buffer_sig(int signal, int block);
void buffer_ignore_lowmem(void)
{
#ifndef NOXFERMEM
if(buffermem->wakeme[XF_READER])
xfermem_putcmd(buffermem->fd[XF_WRITER], XF_CMD_WAKEUP);
#endif
}
void buffer_end(void)
{
#ifndef NOXFERMEM
xfermem_putcmd(buffermem->fd[XF_WRITER], XF_CMD_TERMINATE);
#endif
}
void buffer_resync(void)
{
buffer_sig(SIGINT, TRUE);
}
void buffer_reset(void)
{
buffer_sig(SIGUSR1, TRUE);
}
void buffer_start(void)
{
buffer_sig(SIGCONT, FALSE);
}
void buffer_stop(void)
{
buffer_sig(SIGSTOP, FALSE);
}
extern int buffer_pid;
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;
}
#ifndef NOXFERMEM
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);
}
#ifndef NO_DECODE_AUDIO
if (param.outmode == DECODE_AUDIO)
audio_close (ai);
#endif
}
#endif
/* EOF */
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