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Fix OGG audio loop offset pop.

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Co-authored-by: MJacred <loesch.benny92@gmx.de>
Co-authored-by: Ellen Poe <ellen.h.poe@gmail.com>
Co-authored-by: Michael Wörner <mwoerner@semw-software.com>
This commit is contained in:
strellydev
2023-08-09 17:40:08 +01:00
parent 51f81e1c88
commit 9c9f1154f8
5 changed files with 109 additions and 104 deletions
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165
modules/vorbis/audio_stream_ogg_vorbis.cpp
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@ -264,11 +264,10 @@ void AudioStreamPlaybackOggVorbis::seek(double p_time) {
return;
}
vorbis_synthesis_restart(&dsp_state);
if (p_time >= vorbis_stream->get_length()) {
p_time = 0;
}
frames_mixed = uint32_t(vorbis_data->get_sampling_rate() * p_time);
const int64_t desired_sample = p_time * get_stream_sampling_rate();
@ -278,107 +277,81 @@ void AudioStreamPlaybackOggVorbis::seek(double p_time) {
return;
}
ogg_packet *packet;
if (!vorbis_data_playback->next_ogg_packet(&packet)) {
WARN_PRINT_ONCE("seeking beyond limits");
return;
// We want to start decoding before the page that we expect the sample to be in (the sample may
// be part of a partial packet across page boundaries). Otherwise, the decoder may not have
// synchronized before reaching the sample.
int64_t start_page_number = vorbis_data_playback->get_page_number() - 1;
if (start_page_number < 0) {
start_page_number = 0;
}
// The granule position of the page we're seeking through.
int64_t granule_pos = 0;
int headers_remaining = 0;
int samples_in_page = 0;
int err;
while (true) {
if (vorbis_synthesis_idheader(packet)) {
headers_remaining = 3;
}
if (!headers_remaining) {
err = vorbis_synthesis(&block, packet);
ERR_FAIL_COND_MSG(err != 0, "Error during vorbis synthesis " + itos(err));
err = vorbis_synthesis_blockin(&dsp_state, &block);
ERR_FAIL_COND_MSG(err != 0, "Error during vorbis block processing " + itos(err));
int samples_out = vorbis_synthesis_pcmout(&dsp_state, nullptr);
err = vorbis_synthesis_read(&dsp_state, samples_out);
ERR_FAIL_COND_MSG(err != 0, "Error during vorbis read updating " + itos(err));
samples_in_page += samples_out;
} else {
headers_remaining--;
}
if (packet->granulepos != -1 && headers_remaining == 0) {
// This indicates the end of the page.
granule_pos = packet->granulepos;
break;
}
if (packet->e_o_s) {
break;
}
if (!vorbis_data_playback->next_ogg_packet(&packet)) {
// We should get an e_o_s flag before this happens.
WARN_PRINT("Vorbis file ended without warning.");
break;
}
}
int64_t samples_to_burn = samples_in_page - (granule_pos - desired_sample);
if (samples_to_burn > samples_in_page) {
WARN_PRINT_ONCE("Burning more samples than we have in this page. Check seek algorithm.");
} else if (samples_to_burn < 0) {
WARN_PRINT_ONCE("Burning negative samples doesn't make sense. Check seek algorithm.");
}
// Seek again, this time we'll burn a specific number of samples instead of all of them.
if (!vorbis_data_playback->seek_page(desired_sample)) {
WARN_PRINT("seek failed");
return;
}
if (!vorbis_data_playback->next_ogg_packet(&packet)) {
WARN_PRINT_ONCE("seeking beyond limits");
return;
}
vorbis_synthesis_restart(&dsp_state);
while (true) {
if (vorbis_synthesis_idheader(packet)) {
headers_remaining = 3;
}
if (!headers_remaining) {
err = vorbis_synthesis(&block, packet);
ERR_FAIL_COND_MSG(err != 0, "Error during vorbis synthesis " + itos(err));
ogg_packet *packet;
int err;
err = vorbis_synthesis_blockin(&dsp_state, &block);
ERR_FAIL_COND_MSG(err != 0, "Error during vorbis block processing " + itos(err));
// We start at an unknown granule position.
int64_t granule_pos = -1;
int samples_out = vorbis_synthesis_pcmout(&dsp_state, nullptr);
int read_samples = samples_to_burn > samples_out ? samples_out : samples_to_burn;
err = vorbis_synthesis_read(&dsp_state, samples_out);
ERR_FAIL_COND_MSG(err != 0, "Error during vorbis read updating " + itos(err));
samples_to_burn -= read_samples;
// Decode data until we get to the desired sample or notice that we have read past it.
vorbis_data_playback->set_page_number(start_page_number);
vorbis_synthesis_restart(&dsp_state);
if (samples_to_burn <= 0) {
break;
while (true) {
if (!vorbis_data_playback->next_ogg_packet(&packet)) {
WARN_PRINT_ONCE("Seeking beyond limits");
return;
}
err = vorbis_synthesis(&block, packet);
if (err != OV_ENOTAUDIO) {
ERR_FAIL_COND_MSG(err != 0, "Error during vorbis synthesis " + itos(err) + ".");
err = vorbis_synthesis_blockin(&dsp_state, &block);
ERR_FAIL_COND_MSG(err != 0, "Error during vorbis block processing " + itos(err) + ".");
int samples_out = vorbis_synthesis_pcmout(&dsp_state, nullptr);
if (granule_pos < 0) {
// We don't know where we are yet, so just keep on decoding.
err = vorbis_synthesis_read(&dsp_state, samples_out);
ERR_FAIL_COND_MSG(err != 0, "Error during vorbis read updating " + itos(err) + ".");
} else if (granule_pos + samples_out >= desired_sample) {
// Our sample is in this block. Skip the beginning of the block up to the sample, then
// return.
int skip_samples = (int)(desired_sample - granule_pos);
err = vorbis_synthesis_read(&dsp_state, skip_samples);
ERR_FAIL_COND_MSG(err != 0, "Error during vorbis read updating " + itos(err) + ".");
have_samples_left = skip_samples < samples_out;
have_packets_left = !packet->e_o_s;
return;
} else {
// Our sample is not in this block. Skip it.
err = vorbis_synthesis_read(&dsp_state, samples_out);
ERR_FAIL_COND_MSG(err != 0, "Error during vorbis read updating " + itos(err) + ".");
granule_pos += samples_out;
}
}
if (packet->granulepos != -1) {
// We found an update to our granule position.
granule_pos = packet->granulepos;
if (granule_pos > desired_sample) {
// We've read past our sample. We need to start on an earlier page.
if (start_page_number == 0) {
// We didn't find the sample even reading from the beginning.
have_samples_left = false;
have_packets_left = !packet->e_o_s;
return;
}
start_page_number--;
break;
}
}
if (packet->e_o_s) {
// We've reached the end of the stream and didn't find our sample.
have_samples_left = false;
have_packets_left = false;
return;
}
} else {
headers_remaining--;
}
if (packet->granulepos != -1 && headers_remaining == 0) {
// This indicates the end of the page.
break;
}
if (packet->e_o_s) {
break;
}
if (!vorbis_data_playback->next_ogg_packet(&packet)) {
// We should get an e_o_s flag before this happens.
WARN_PRINT("Vorbis file ended without warning.");
break;
}
}
}