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Add timer to mod_bert to avoid relying on remote RTP for timing

This commit is contained in:
Moises Silva 2013-08-19 15:43:26 -04:00
parent ef694513df
commit 3248e06b91
1 changed files with 44 additions and 25 deletions
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69
src/mod/applications/mod_bert/mod_bert.c
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@ -55,6 +55,7 @@ typedef struct {
switch_time_t timeout;
FILE *input_debug_f;
FILE *output_debug_f;
switch_timer_t timer;
} bert_t;
#define bert_increase_milliwatt_index(index) \
@ -100,8 +101,11 @@ SWITCH_STANDARD_APP(bert_test_function)
const char *var = NULL;
int i = 0;
int synced = 0;
uint32_t write_ts = 0;
int32_t timeout_ms = 0;
int32_t interval = 20;
int32_t samples = 0;
uint8_t *write_samples = NULL;
uint8_t *read_samples = NULL;
bert_t bert = { 0 };
memset(&bert, 0, sizeof(bert));
@ -161,6 +165,16 @@ SWITCH_STANDARD_APP(bert_test_function)
}
}
/* Setup the timer, so we can send audio at correct time frames even if we do not receive audio */
interval = read_impl.microseconds_per_packet / 1000;
samples = switch_samples_per_packet(read_impl.samples_per_second, interval);
if (switch_core_timer_init(&bert.timer, "soft", interval, samples, switch_core_session_get_pool(session)) == SWITCH_STATUS_SUCCESS) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "Setup timer success interval: %u samples: %u\n", interval, samples);
} else {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "Timer Setup Failed. BERT cannot start!\n");
goto done;
}
bert.timeout = (switch_micro_time_now() + (timeout_ms * 1000));
write_frame.codec = switch_core_session_get_read_codec(session);
@ -174,10 +188,32 @@ SWITCH_STANDARD_APP(bert_test_function)
}
switch_channel_set_variable(channel, BERT_STATS_VAR_SYNC_LOST_CNT, "0");
switch_channel_set_variable(channel, BERT_STATS_VAR_SYNC_LOST, "false");
write_samples = write_frame.data;
while (switch_channel_ready(channel)) {
uint8_t *read_samples = NULL;
uint8_t *write_samples = NULL;
switch_core_timer_next(&bert.timer);
/* Write our frame before anything else happens */
for (i = 0; i < read_impl.samples_per_packet; i++) {
/* Calculate our next sequence sample to write */
bert.sequence_sample = ulaw_digital_milliwatt[bert.milliwatt_index];
//switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "[%d] 0x%X\n", bert.milliwatt_index, bert.sequence_sample);
bert_increase_milliwatt_index(bert.milliwatt_index);
//switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "[%d] 0x%X\n", bert.milliwatt_index, bert.sequence_sample);
write_samples[i] = bert.sequence_sample;
}
write_frame.datalen = read_impl.samples_per_packet;
write_frame.samples = read_impl.samples_per_packet;
write_frame.timestamp = bert.timer.samplecount;
if (bert.output_debug_f) {
fwrite(write_frame.data, write_frame.datalen, 1, bert.output_debug_f);
}
status = switch_core_session_write_frame(session, &write_frame, SWITCH_IO_FLAG_NONE, 0);
if (!SWITCH_READ_ACCEPTABLE(status)) {
break;
}
/* Proceed to read and process the readed frame ... */
status = switch_core_session_read_frame(session, &read_frame, SWITCH_IO_FLAG_NONE, 0);
if (!SWITCH_READ_ACCEPTABLE(status)) {
break;
@ -191,6 +227,7 @@ SWITCH_STANDARD_APP(bert_test_function)
if (bert.hangup_on_error) {
switch_channel_hangup(channel, SWITCH_CAUSE_MEDIA_TIMEOUT);
}
bert.timeout = 0;
}
}
@ -200,12 +237,11 @@ SWITCH_STANDARD_APP(bert_test_function)
}
if (read_frame->samples != read_impl.samples_per_packet) {
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "Only read %d samples, expected %d!\n", read_frame->samples, read_impl.samples_per_packet);
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "Read %d samples, expected %d!\n", read_frame->samples, read_impl.samples_per_packet);
continue;
}
read_samples = read_frame->data;
write_samples = write_frame.data;
if (bert.input_debug_f) {
size_t ret = fwrite(read_frame->data, read_frame->datalen, 1, bert.input_debug_f);
if (ret != 1) {
@ -262,36 +298,19 @@ SWITCH_STANDARD_APP(bert_test_function)
}
}
/* Calculate our next sequence sample to write */
bert.sequence_sample = ulaw_digital_milliwatt[bert.milliwatt_index];
//switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "[%d] 0x%X\n", bert.milliwatt_index, bert.sequence_sample);
bert_increase_milliwatt_index(bert.milliwatt_index);
//switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_ERROR, "[%d] 0x%X\n", bert.milliwatt_index, bert.sequence_sample);
write_samples[i] = bert.sequence_sample;
/* Try to guess what the next sample will be in the milliwatt sequence */
bert.predicted_sample = ulaw_digital_milliwatt[bert.milliwatt_prediction_index];
bert_increase_milliwatt_index(bert.milliwatt_prediction_index);
bert.processed_samples++;
}
write_frame.datalen = read_frame->datalen;
write_frame.samples = i;
write_frame.timestamp = write_ts;
if (bert.output_debug_f) {
fwrite(write_frame.data, write_frame.datalen, 1, bert.output_debug_f);
}
status = switch_core_session_write_frame(session, &write_frame, SWITCH_IO_FLAG_NONE, 0);
if (!SWITCH_READ_ACCEPTABLE(status)) {
break;
}
write_ts += read_impl.samples_per_packet;
}
done:
bert_close_debug_streams(bert, session);
if (bert.timer.interval) {
switch_core_timer_destroy(&bert.timer);
}
switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "BERT Test Completed. MaxErr=%f%%\n", synced ? bert.max_err_hit : bert.max_err_ever);
}