// get the next frame, when available. return 0 if underrun/stream reset.
static short *buffer_get_frame(void) {
short buf_fill;
seq_t read;
abuf_t *abuf = 0;
unsigned short next;
int i;
pthread_mutex_lock(&ab_mutex);
buf_fill = ab_write - ab_read;
if (buf_fill < 1 || !ab_synced || ab_buffering) { // init or underrun. stop and wait
if (ab_synced)
fprintf(stderr, "\nunderrun.\n");
ab_buffering = 1;
pthread_cond_wait(&ab_buffer_ready, &ab_mutex);
ab_read++;
buf_fill = ab_write - ab_read;
bf_est_reset(buf_fill);
pthread_mutex_unlock(&ab_mutex);
return 0;
}
if (buf_fill >= BUFFER_FRAMES) { // overrunning! uh-oh. restart at a sane distance
fprintf(stderr, "\noverrun.\n");
ab_read = ab_write - buffer_start_fill;
}
read = ab_read;
ab_read++;
buf_fill = ab_write - ab_read;
bf_est_update(buf_fill);
// check if t+16, t+32, t+64, t+128, ... (START_FILL / 2)
// packets have arrived... last-chance resend
if (!ab_buffering) {
for (i = 16; i < (START_FILL / 2); i = (i * 2)) {
next = ab_read + i;
abuf = audio_buffer + BUFIDX(next);
if (!abuf->ready) {
rtp_request_resend(next, next);
}
}
}
abuf_t *curframe = audio_buffer + BUFIDX(read);
if (!curframe->ready) {
fprintf(stderr, "\nmissing frame.\n");
memset(curframe->data, 0, FRAME_BYTES);
}
curframe->ready = 0;
pthread_mutex_unlock(&ab_mutex);
return curframe->data;
}
// get the next frame, when available. return 0 if underrun/stream reset.
static short *buffer_get_frame(void) {
short buf_fill;
seq_t read;
abuf_t *abuf = 0;
pthread_mutex_lock(&ab_mutex);
buf_fill = ab_write - ab_read;
if (buf_fill < 1 || !ab_synced || ab_buffering) { // init or underrun. stop and wait
if (ab_synced)
fprintf(stderr, "\nunderrun.\n");
ab_buffering = 1;
pthread_cond_wait(&ab_buffer_ready, &ab_mutex);
ab_read++;
buf_fill = ab_write - ab_read;
bf_est_reset(buf_fill);
pthread_mutex_unlock(&ab_mutex);
return 0;
}
if (buf_fill >= BUFFER_FRAMES) { // overrunning! uh-oh. restart at a sane distance
fprintf(stderr, "\noverrun.\n");
ab_read = ab_write - buffer_start_fill;
}
read = ab_read;
ab_read++;
buf_fill = ab_write - ab_read;
bf_est_update(buf_fill);
if (!ab_buffering) {
// check if the t+5th packet has arrived... last-chance resend
read = ab_read + 5;
abuf = audio_buffer + BUFIDX(read);
if (!abuf->ready) {
rtp_request_resend(read, read);
abuf->ready = -1;
}
}
abuf_t *curframe = audio_buffer + BUFIDX(read);
if (!curframe->ready) {
fprintf(stderr, "\nmissing frame.\n");
memset(curframe->data, 0, FRAME_BYTES);
}
curframe->ready = 0;
pthread_mutex_unlock(&ab_mutex);
return curframe->data;
}
// get the next frame, when available. return 0 if underrun/stream reset.
static inline short buffer_get_frame(signed short **inbuf) {
unsigned short buf_fill;
seq_t read;
pthread_mutex_lock(&ab_mutex);
buf_fill=BUF_FILL_SIZE(ab_write,ab_read);
#ifdef DEBUG
fprintf(stderr,"ab_write=%d ab_read=%d buf_fill=%d ab_buffering=%d\n",ab_write,ab_read,buf_fill,ab_buffering);
#endif
if (buf_fill < 1 || !ab_synced || ab_buffering) { // init or underrun. stop and wait
#ifdef DEBUG
if (ab_synced)
fprintf(stderr, "\nunderrun.\n");
#endif
ab_buffering = 1;
pthread_cond_wait(&ab_buffer_ready, &ab_mutex);
ab_read++;
buf_fill=BUF_FILL_SIZE(ab_write,ab_read);
bf_est_reset(buf_fill);
pthread_mutex_unlock(&ab_mutex);
return 0;
}
if (buf_fill < BUFFER_FRAMES) {
#ifdef DEBUG
fprintf(stderr, "pthread_cond_signal ab_buffer_full\n");
#endif
pthread_cond_signal(&ab_buffer_full);
}
read = ab_read;
ab_read++;
buf_fill=BUF_FILL_SIZE(ab_write,ab_read);
bf_est_update(buf_fill);
abuf_t *curframe = audio_buffer + BUFIDX(read);
if (curframe->ready) {
alac_decode(*inbuf, curframe->data, curframe->len);
curframe->ready = 0;
pthread_mutex_unlock(&ab_mutex);
return 1;
} else {
#ifdef DEBUG
fprintf(stderr, "\nmissing frame.\n");
#endif
curframe->ready = 0;
pthread_mutex_unlock(&ab_mutex);
return 0;
}
}
// get the next frame, when available. return 0 if underrun/stream reset.
short *buffer_get_frame(void) {
short buf_fill;
seq_t read;
pthread_mutex_lock(&ab_mutex);
buf_fill = ab_write - ab_read;
if (buf_fill < 1 || !ab_synced) { // init or underrun. stop and wait
if (ab_synced)
fprintf(stderr, "\nunderrun.\n");
ab_buffering = 1;
pthread_cond_wait(&ab_buffer_ready, &ab_mutex);
ab_read++;
buf_fill = ab_write - ab_read;
pthread_mutex_unlock(&ab_mutex);
bf_est_reset(buf_fill);
return 0;
}
if (buf_fill >= BUFFER_FRAMES) { // overrunning! uh-oh. restart at a sane distance
fprintf(stderr, "\noverrun.\n");
ab_read = ab_write - START_FILL;
}
read = ab_read;
ab_read++;
pthread_mutex_unlock(&ab_mutex);
buf_fill = ab_write - ab_read;
bf_est_update(buf_fill);
volatile abuf_t *curframe = audio_buffer + BUFIDX(read);
if (!curframe->ready) {
fprintf(stderr, "\nmissing frame.\n");
memset(curframe->data, 0, FRAME_BYTES);
}
curframe->ready = 0;
return curframe->data;
}
void player_put_packet(seq_t seqno, uint8_t *data, int len) {
abuf_t *abuf = 0;
int16_t buf_fill;
pthread_mutex_lock(&ab_mutex);
if (!ab_synced) {
debug(2, "syncing to first seqno %04X\n", seqno);
ab_write = seqno-1;
ab_read = seqno;
ab_synced = 1;
}
if (seq_diff(ab_write, seqno) == 1) { // expected packet
abuf = audio_buffer + BUFIDX(seqno);
ab_write = seqno;
} else if (seq_order(ab_write, seqno)) { // newer than expected
rtp_request_resend(ab_write+1, seqno-1);
abuf = audio_buffer + BUFIDX(seqno);
ab_write = seqno;
} else if (seq_order(ab_read, seqno)) { // late but not yet played
abuf = audio_buffer + BUFIDX(seqno);
} else { // too late.
debug(1, "late packet %04X (%04X:%04X)", seqno, ab_read, ab_write);
}
buf_fill = seq_diff(ab_read, ab_write);
pthread_mutex_unlock(&ab_mutex);
if (abuf) {
alac_decode(abuf->data, data, len);
abuf->ready = 1;
}
pthread_mutex_lock(&ab_mutex);
if (ab_buffering && buf_fill >= config.buffer_start_fill) {
debug(1, "buffering over. starting play\n");
ab_buffering = 0;
bf_est_reset(buf_fill);
}
pthread_mutex_unlock(&ab_mutex);
}
