void RtpAudioStream::decode()
{
if (rtp_packets_.size() < 1) return;
// gtk/rtp_player.c:decode_rtp_stream
// XXX This is more messy than it should be.
gsize resample_buff_len = 0x1000;
SAMPLE *resample_buff = (SAMPLE *) g_malloc(resample_buff_len);
spx_uint32_t cur_in_rate = 0, visual_out_rate = 0;
char *write_buff = NULL;
qint64 write_bytes = 0;
unsigned channels = 0;
unsigned sample_rate = 0;
int last_sequence = 0;
double rtp_time_prev = 0.0;
double arrive_time_prev = 0.0;
double pack_period = 0.0;
double start_time = 0.0;
double start_rtp_time = 0.0;
guint32 start_timestamp = 0;
size_t decoded_bytes_prev = 0;
for (int cur_packet = 0; cur_packet < rtp_packets_.size(); cur_packet++) {
SAMPLE *decode_buff = NULL;
// XXX The GTK+ UI updates a progress bar here.
rtp_packet_t *rtp_packet = rtp_packets_[cur_packet];
stop_rel_time_ = start_rel_time_ + rtp_packet->arrive_offset;
ws_codec_resampler_get_rate(visual_resampler_, &cur_in_rate, &visual_out_rate);
QString payload_name;
if (rtp_packet->info->info_payload_type_str) {
payload_name = rtp_packet->info->info_payload_type_str;
} else {
payload_name = try_val_to_str_ext(rtp_packet->info->info_payload_type, &rtp_payload_type_short_vals_ext);
}
if (!payload_name.isEmpty()) {
payload_names_ << payload_name;
}
if (cur_packet < 1) { // First packet
start_timestamp = rtp_packet->info->info_timestamp;
start_rtp_time = 0;
rtp_time_prev = 0;
last_sequence = rtp_packet->info->info_seq_num - 1;
}
size_t decoded_bytes = decode_rtp_packet(rtp_packet, &decode_buff, decoders_hash_, &channels, &sample_rate);
if (decoded_bytes == 0 || sample_rate == 0) {
// We didn't decode anything. Clean up and prep for the next packet.
last_sequence = rtp_packet->info->info_seq_num;
continue;
}
if (audio_out_rate_ == 0) { // First non-zero wins
audio_out_rate_ = sample_rate;
RTP_STREAM_DEBUG("Audio sample rate is %u", audio_out_rate_);
// Prepend silence to match our sibling streams.
tempfile_->seek(0);
int prepend_samples = (start_rel_time_ - global_start_rel_time_) * audio_out_rate_;
if (prepend_samples > 0) {
writeSilence(prepend_samples);
}
}
if (rtp_packet->info->info_seq_num != last_sequence+1) {
out_of_seq_timestamps_.append(stop_rel_time_);
}
last_sequence = rtp_packet->info->info_seq_num;
double rtp_time = (double)(rtp_packet->info->info_timestamp-start_timestamp)/sample_rate - start_rtp_time;
double arrive_time;
if (timing_mode_ == Uninterrupted) {
arrive_time = rtp_time;
} else {
arrive_time = (double)rtp_packet->arrive_offset/1000 - start_time;
}
double diff = qAbs(arrive_time - rtp_time);
if (diff*1000 > jitter_buffer_size_ && timing_mode_ == Uninterrupted) {
// rtp_player.c:628
jitter_drop_timestamps_.append(stop_rel_time_);
RTP_STREAM_DEBUG("Packet drop by jitter buffer exceeded %f > %d", diff*1000, jitter_buffer_size_);
/* if there was a silence period (more than two packetization period) resync the source */
if ( (rtp_time - rtp_time_prev) > pack_period*2 ) {
int silence_samples;
RTP_STREAM_DEBUG("Resync...");
silence_samples = (int)((arrive_time - arrive_time_prev)*sample_rate - decoded_bytes_prev / sample_bytes_);
/* Fix for bug 4119/5902: don't insert too many silence frames.
* XXX - is there a better thing to do here?
*/
silence_samples = qMin(silence_samples, max_silence_samples_);
writeSilence(silence_samples);
silence_timestamps_.append(stop_rel_time_);
decoded_bytes_prev = 0;
/* defined start_timestmp to avoid overflow in timestamp. TODO: handle the timestamp correctly */
/* XXX: if timestamps (RTP) are missing/ignored try use packet arrive time only (see also "rtp_time") */
start_timestamp = rtp_packet->info->info_timestamp;
start_rtp_time = 0;
start_time = (double)rtp_packet->arrive_offset/1000;
rtp_time_prev = 0;
}
} else {
// rtp_player.c:664
/* Add silence if it is necessary */
int silence_samples;
if (timing_mode_ == Uninterrupted) {
silence_samples = 0;
} else {
silence_samples = (int)((rtp_time - rtp_time_prev)*sample_rate - decoded_bytes_prev / sample_bytes_);
}
if (silence_samples != 0) {
wrong_timestamp_timestamps_.append(stop_rel_time_);
}
if (silence_samples > 0) {
/* Fix for bug 4119/5902: don't insert too many silence frames.
* XXX - is there a better thing to do here?
*/
silence_samples = qMin(silence_samples, max_silence_samples_);
writeSilence(silence_samples);
silence_timestamps_.append(stop_rel_time_);
}
// XXX rtp_player.c:696 adds audio here.
rtp_time_prev = rtp_time;
pack_period = (double) decoded_bytes / sample_bytes_ / sample_rate;
decoded_bytes_prev = decoded_bytes;
arrive_time_prev = arrive_time;
}
// Write samples to our file.
write_buff = (char *) decode_buff;
write_bytes = rtp_packet->info->info_payload_len * sample_bytes_;
if (audio_out_rate_ != sample_rate) {
// Resample the audio to match our previous output rate.
if (!audio_resampler_) {
audio_resampler_ = ws_codec_resampler_init(1, sample_rate, audio_out_rate_, 10, NULL);
ws_codec_resampler_skip_zeros(audio_resampler_);
RTP_STREAM_DEBUG("Started resampling from %u to (out) %u Hz.", sample_rate, audio_out_rate_);
} else {
spx_uint32_t audio_out_rate;
ws_codec_resampler_get_rate(audio_resampler_, &cur_in_rate, &audio_out_rate);
// Adjust rates if needed.
if (sample_rate != cur_in_rate) {
ws_codec_resampler_set_rate(audio_resampler_, sample_rate, audio_out_rate);
ws_codec_resampler_set_rate(visual_resampler_, sample_rate, visual_out_rate);
RTP_STREAM_DEBUG("Changed input rate from %u to %u Hz. Out is %u.", cur_in_rate, sample_rate, audio_out_rate_);
}
}
spx_uint32_t in_len = (spx_uint32_t)rtp_packet->info->info_payload_len;
spx_uint32_t out_len = (audio_out_rate_ * (spx_uint32_t)rtp_packet->info->info_payload_len / sample_rate) + (audio_out_rate_ % sample_rate != 0);
if (out_len * sample_bytes_ > resample_buff_len) {
while ((out_len * sample_bytes_ > resample_buff_len))
resample_buff_len *= 2;
resample_buff = (SAMPLE *) g_realloc(resample_buff, resample_buff_len);
}
ws_codec_resampler_process_int(audio_resampler_, 0, decode_buff, &in_len, resample_buff, &out_len);
write_buff = (char *) decode_buff;
write_bytes = out_len * sample_bytes_;
}
// Write the decoded, possibly-resampled audio to our temp file.
tempfile_->write(write_buff, write_bytes);
// Collect our visual samples.
spx_uint32_t in_len = (spx_uint32_t)rtp_packet->info->info_payload_len;
spx_uint32_t out_len = (visual_out_rate * in_len / sample_rate) + (visual_out_rate % sample_rate != 0);
if (out_len * sample_bytes_ > resample_buff_len) {
while ((out_len * sample_bytes_ > resample_buff_len))
resample_buff_len *= 2;
resample_buff = (SAMPLE *) g_realloc(resample_buff, resample_buff_len);
}
ws_codec_resampler_process_int(visual_resampler_, 0, decode_buff, &in_len, resample_buff, &out_len);
for (unsigned i = 0; i < out_len; i++) {
packet_timestamps_[stop_rel_time_ + (double) i / visual_out_rate] = rtp_packet->frame_num;
if (qAbs(resample_buff[i]) > max_sample_val_) max_sample_val_ = qAbs(resample_buff[i]);
visual_samples_.append(resample_buff[i]);
}
// Finally, write the resampled audio to our temp file and clean up.
g_free(decode_buff);
}
g_free(resample_buff);
}
void RtpAudioStream::addRtpPacket(const struct _packet_info *pinfo, const _rtp_info *rtp_info)
{
if (!rtp_info) return;
// Combination of gtk/rtp_player.c:decode_rtp_stream + decode_rtp_packet
// XXX This is more messy than it should be.
SAMPLE *decode_buff = NULL;
SAMPLE *resample_buff = NULL;
spx_uint32_t cur_in_rate, visual_out_rate;
char *write_buff;
qint64 write_bytes;
unsigned channels;
unsigned sample_rate;
rtp_packet_t rtp_packet;
stop_rel_time_ = nstime_to_sec(&pinfo->rel_ts);
ws_codec_resampler_get_rate(visual_resampler_, &cur_in_rate, &visual_out_rate);
QString payload_name;
if (rtp_info->info_payload_type_str) {
payload_name = rtp_info->info_payload_type_str;
} else {
payload_name = try_val_to_str_ext(rtp_info->info_payload_type, &rtp_payload_type_short_vals_ext);
}
if (!payload_name.isEmpty()) {
payload_names_ << payload_name;
}
// First, decode the payload.
rtp_packet.info = (_rtp_info *) g_memdup(rtp_info, sizeof(struct _rtp_info));
rtp_packet.arrive_offset = start_rel_time_;
if (rtp_info->info_all_data_present && (rtp_info->info_payload_len != 0)) {
rtp_packet.payload_data = (guint8 *)g_malloc(rtp_info->info_payload_len);
memcpy(rtp_packet.payload_data, rtp_info->info_data + rtp_info->info_payload_offset, rtp_info->info_payload_len);
} else {
rtp_packet.payload_data = NULL;
}
//size_t decoded_bytes =
decode_rtp_packet(&rtp_packet, &decode_buff, decoders_hash_, &channels, &sample_rate);
write_buff = (char *) decode_buff;
write_bytes = rtp_info->info_payload_len * sample_bytes_;
if (tempfile_->pos() == 0) {
// First packet. Let it determine our sample rate.
audio_out_rate_ = sample_rate;
last_sequence_ = rtp_info->info_seq_num - 1;
// Prepend silence to match our sibling streams.
int prepend_samples = (start_rel_time_ - global_start_rel_time_) * audio_out_rate_;
if (prepend_samples > 0) {
int prepend_bytes = prepend_samples * sample_bytes_;
char *prepend_buff = (char *) g_malloc(prepend_bytes);
SAMPLE silence = 0;
memccpy(prepend_buff, &silence, prepend_samples, sample_bytes_);
tempfile_->write(prepend_buff, prepend_bytes);
}
} else if (audio_out_rate_ != sample_rate) {
// Resample the audio to match our previous output rate.
if (!audio_resampler_) {
audio_resampler_ = ws_codec_resampler_init(1, sample_rate, audio_out_rate_, 10, NULL);
ws_codec_resampler_skip_zeros(audio_resampler_);
// RTP_STREAM_DEBUG("Started resampling from %u to (out) %u Hz.", sample_rate, audio_out_rate_);
} else {
spx_uint32_t audio_out_rate;
ws_codec_resampler_get_rate(audio_resampler_, &cur_in_rate, &audio_out_rate);
// Adjust rates if needed.
if (sample_rate != cur_in_rate) {
ws_codec_resampler_set_rate(audio_resampler_, sample_rate, audio_out_rate);
ws_codec_resampler_set_rate(visual_resampler_, sample_rate, visual_out_rate);
// RTP_STREAM_DEBUG("Changed input rate from %u to %u Hz. Out is %u.", cur_in_rate, sample_rate, audio_out_rate_);
}
}
spx_uint32_t in_len = (spx_uint32_t)rtp_info->info_payload_len;
spx_uint32_t out_len = (audio_out_rate_ * (spx_uint32_t)rtp_info->info_payload_len / sample_rate) + (audio_out_rate_ % sample_rate != 0);
resample_buff = (SAMPLE *) g_malloc(out_len * sample_bytes_);
ws_codec_resampler_process_int(audio_resampler_, 0, decode_buff, &in_len, resample_buff, &out_len);
write_buff = (char *) decode_buff;
write_bytes = out_len * sample_bytes_;
}
if (rtp_info->info_seq_num != last_sequence_+1) {
out_of_seq_timestamps_.append(stop_rel_time_);
// XXX Add silence to tempfile_ and visual_samples_
}
last_sequence_ = rtp_info->info_seq_num;
// Write the decoded, possibly-resampled audio to our temp file.
tempfile_->write(write_buff, write_bytes);
// Collect our visual samples.
spx_uint32_t in_len = (spx_uint32_t)rtp_info->info_payload_len;
spx_uint32_t out_len = (visual_out_rate * in_len / sample_rate) + (visual_out_rate % sample_rate != 0);
resample_buff = (SAMPLE *) g_realloc(resample_buff, out_len * sizeof(SAMPLE));
ws_codec_resampler_process_int(visual_resampler_, 0, decode_buff, &in_len, resample_buff, &out_len);
for (unsigned i = 0; i < out_len; i++) {
packet_timestamps_[stop_rel_time_ + (double) i / visual_out_rate] = pinfo->fd->num;
if (qAbs(resample_buff[i]) > max_sample_val_) max_sample_val_ = qAbs(resample_buff[i]);
visual_samples_.append(resample_buff[i]);
}
// Finally, write the resampled audio to our temp file and clean up.
g_free(rtp_packet.payload_data);
g_free(decode_buff);
g_free(resample_buff);
}