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Timestamp according to RFC

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This commit is contained in:
Mark Hills 2012-07-28 20:44:19 +01:00
parent 43f31b8e17
commit b1dab96f00
2 changed files with 20 additions and 7 deletions
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10
rx.c
View File

@ -91,7 +91,8 @@ static int play_one_frame(void *packet,
static int run_rx(RtpSession *session, static int run_rx(RtpSession *session,
OpusDecoder *decoder, OpusDecoder *decoder,
snd_pcm_t *snd, snd_pcm_t *snd,
const unsigned int channels) const unsigned int channels,
const unsigned int rate)
{ {
int ts = 0; int ts = 0;
@ -118,7 +119,10 @@ static int run_rx(RtpSession *session,
if (r == -1) if (r == -1)
return -1; return -1;
ts += r; /* Follow the RFC, 48kHz is reference rate for
* timestamps */
ts += r * 48000 / rate;
} }
} }
@ -227,7 +231,7 @@ int main(int argc, char *argv[])
return -1; return -1;
go_realtime(); go_realtime();
r = run_rx(session, decoder, snd, channels); r = run_rx(session, decoder, snd, channels, rate);
if (snd_pcm_close(snd) < 0) if (snd_pcm_close(snd) < 0)
abort(); abort();

17
tx.c
View File

@ -57,13 +57,14 @@ static int send_one_frame(snd_pcm_t *snd,
const snd_pcm_uframes_t samples, const snd_pcm_uframes_t samples,
OpusEncoder *encoder, OpusEncoder *encoder,
const size_t bytes_per_frame, const size_t bytes_per_frame,
const unsigned int ts_per_frame,
RtpSession *session) RtpSession *session)
{ {
float *pcm; float *pcm;
void *packet; void *packet;
ssize_t z; ssize_t z;
snd_pcm_sframes_t f; snd_pcm_sframes_t f;
static int ts = 0; static unsigned int ts = 0;
pcm = alloca(sizeof(float) * samples * channels); pcm = alloca(sizeof(float) * samples * channels);
packet = alloca(bytes_per_frame); packet = alloca(bytes_per_frame);
@ -83,7 +84,7 @@ static int send_one_frame(snd_pcm_t *snd,
} }
rtp_session_send_with_ts(session, packet, z, ts); rtp_session_send_with_ts(session, packet, z, ts);
ts += samples; ts += ts_per_frame;
return 0; return 0;
} }
@ -93,13 +94,14 @@ static int run_tx(snd_pcm_t *snd,
const snd_pcm_uframes_t frame, const snd_pcm_uframes_t frame,
OpusEncoder *encoder, OpusEncoder *encoder,
const size_t bytes_per_frame, const size_t bytes_per_frame,
const unsigned int ts_per_frame,
RtpSession *session) RtpSession *session)
{ {
for (;;) { for (;;) {
int r; int r;
r = send_one_frame(snd, channels, frame, r = send_one_frame(snd, channels, frame,
encoder, bytes_per_frame, encoder, bytes_per_frame, ts_per_frame,
session); session);
if (r == -1) if (r == -1)
return -1; return -1;
@ -148,6 +150,7 @@ int main(int argc, char *argv[])
{ {
int r, error; int r, error;
size_t bytes_per_frame; size_t bytes_per_frame;
unsigned int ts_per_frame;
snd_pcm_t *snd; snd_pcm_t *snd;
OpusEncoder *encoder; OpusEncoder *encoder;
RtpSession *session; RtpSession *session;
@ -215,6 +218,11 @@ int main(int argc, char *argv[])
bytes_per_frame = kbps * 1024 * frame / rate / 8; bytes_per_frame = kbps * 1024 * frame / rate / 8;
/* Follow the RFC, 48kHz is reference rate for
* timestamps */
ts_per_frame = frame * 48000 / rate;
ortp_init(); ortp_init();
ortp_scheduler_init(); ortp_scheduler_init();
ortp_set_log_level_mask(ORTP_MESSAGE|ORTP_WARNING|ORTP_ERROR); ortp_set_log_level_mask(ORTP_MESSAGE|ORTP_WARNING|ORTP_ERROR);
@ -232,7 +240,8 @@ int main(int argc, char *argv[])
return -1; return -1;
go_realtime(); go_realtime();
r = run_tx(snd, channels, frame, encoder, bytes_per_frame, session); r = run_tx(snd, channels, frame, encoder, bytes_per_frame,
ts_per_frame, session);
if (snd_pcm_close(snd) < 0) if (snd_pcm_close(snd) < 0)
abort(); abort();