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(1, "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
// Be careful with new packets that are in advance
// Those more than a buffer size in advance will cause an Overrun
// When buffering the valid threshold should be the buffer fill target itself which should re-sync
if (ab_buffering && (seq_diff(ab_read, seqno) > config.buffer_start_fill)) {
warn("out of range re-sync %04X (%04X:%04X)", seqno, ab_read, ab_write);
ab_resync();
ab_synced = 1;
ab_read = seqno;
ab_write = seqno;
abuf = audio_buffer + BUFIDX(seqno);
} else {
debug(1, "advance packet %04X (%04X:%04X)\n", seqno, ab_read, ab_write);
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);
if (abuf->ready) { // discard this frame if frame previously received
abuf =0;
debug(1, "duplicate packet %04X (%04X:%04X)\n", seqno, ab_read, ab_write);
}
} else { // too late.
debug(1, "late packet %04X (%04X:%04X)\n", 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 (%04X:%04X)\n", ab_read, ab_write);
ab_buffering = 0;
}
pthread_mutex_unlock(&ab_mutex);
}
// 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;
}
}
void buffer_put_packet(seq_t seqno, char *data, int len) {
volatile abuf_t *abuf = 0;
short read;
short buf_fill;
pthread_mutex_lock(&ab_mutex);
if (!ab_synced) {
ab_write = seqno;
ab_read = seqno-1;
ab_synced = 1;
}
if (seqno == ab_write+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, 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.
fprintf(stderr, "\nlate packet %04X (%04X:%04X)\n", seqno, ab_read, ab_write);
}
buf_fill = ab_write - ab_read;
pthread_mutex_unlock(&ab_mutex);
if (abuf) {
alac_decode(abuf->data, data, len);
abuf->ready = 1;
}
if (ab_buffering && buf_fill >= buffer_start_fill) {
ab_buffering = 0;
pthread_cond_signal(&ab_buffer_ready);
}
if (!ab_buffering) {
// check if the t+10th packet has arrived... last-chance resend
read = ab_read + 10;
abuf = audio_buffer + BUFIDX(read);
if (abuf->ready != 1) {
rtp_request_resend(read, read);
abuf->ready = -1;
}
}
}
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);
}
void player_put_packet(seq_t seqno, uint32_t timestamp, uint8_t *data, int len) {
pthread_mutex_lock(&ab_mutex);
packet_count++;
time_of_last_audio_packet = get_absolute_time_in_fp();
if (connection_state_to_output) { // if we are supposed to be processing these packets
if ((flush_rtp_timestamp != 0) &&
((timestamp == flush_rtp_timestamp) || seq32_order(timestamp, flush_rtp_timestamp))) {
debug(2, "Dropping flushed packet in player_put_packet, seqno %u, timestamp %u, flushing to "
"timestamp: %u.",
seqno, timestamp, flush_rtp_timestamp);
} else {
if ((flush_rtp_timestamp != 0x0) &&
(!seq32_order(timestamp,
flush_rtp_timestamp))) // if we have gone past the flush boundary time
flush_rtp_timestamp = 0x0;
abuf_t *abuf = 0;
if (!ab_synced) {
debug(2, "syncing to seqno %u.", seqno);
ab_write = seqno;
ab_read = seqno;
ab_synced = 1;
}
if (ab_write == seqno) { // expected packet
abuf = audio_buffer + BUFIDX(seqno);
ab_write = SUCCESSOR(seqno);
} else if (seq_order(ab_write, seqno)) { // newer than expected
// if (ORDINATE(seqno)>(BUFFER_FRAMES*7)/8)
// debug(1,"An interval of %u frames has opened, with ab_read: %u, ab_write: %u and seqno:
// %u.",seq_diff(ab_read,seqno),ab_read,ab_write,seqno);
int32_t gap = seq_diff(ab_write, PREDECESSOR(seqno)) + 1;
if (gap <= 0)
debug(1, "Unexpected gap size: %d.", gap);
int i;
for (i = 0; i < gap; i++) {
abuf = audio_buffer + BUFIDX(seq_sum(ab_write, i));
abuf->ready = 0; // to be sure, to be sure
abuf->timestamp = 0;
abuf->sequence_number = 0;
}
// debug(1,"N %d s %u.",seq_diff(ab_write,PREDECESSOR(seqno))+1,ab_write);
abuf = audio_buffer + BUFIDX(seqno);
rtp_request_resend(ab_write, gap);
resend_requests++;
ab_write = SUCCESSOR(seqno);
} else if (seq_order(ab_read, seqno)) { // late but not yet played
late_packets++;
abuf = audio_buffer + BUFIDX(seqno);
} else { // too late.
too_late_packets++;
/*
if (!late_packet_message_sent) {
debug(1, "too-late packet received: %u; ab_read: %u; ab_write: %u.", seqno, ab_read,
ab_write);
late_packet_message_sent=1;
}
*/
}
// pthread_mutex_unlock(&ab_mutex);
if (abuf) {
alac_decode(abuf->data, data, len);
abuf->ready = 1;
abuf->timestamp = timestamp;
abuf->sequence_number = seqno;
}
// pthread_mutex_lock(&ab_mutex);
}
int rc = pthread_cond_signal(&flowcontrol);
if (rc)
debug(1, "Error signalling flowcontrol.");
}
pthread_mutex_unlock(&ab_mutex);
}