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Improve ATRAC9 loop performance and cleanup

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This commit is contained in:
bnnm 2018-09-02 21:02:11 +02:00
parent 488daca056
commit bd374a01a7
1 changed files with 49 additions and 29 deletions
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78
src/coding/atrac9_decoder.c
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@ -16,14 +16,15 @@ struct atrac9_codec_data {
int samples_to_discard;
atrac9_config config;
void *handle; /* decoder handle */
Atrac9CodecInfo info; /* decoder info */
};
atrac9_codec_data *init_atrac9(atrac9_config *cfg) {
int status;
uint8_t config_data[4];
Atrac9CodecInfo info = {0};
atrac9_codec_data *data = NULL;
data = calloc(1, sizeof(atrac9_codec_data));
@ -36,20 +37,20 @@ atrac9_codec_data *init_atrac9(atrac9_config *cfg) {
status = Atrac9InitDecoder(data->handle, config_data);
if (status < 0) goto fail;
status = Atrac9GetCodecInfo(data->handle, &info);
status = Atrac9GetCodecInfo(data->handle, &data->info);
if (status < 0) goto fail;
//;VGM_LOG("ATRAC9: config=%x, sf-size=%x, sub-frames=%i x %i samples\n", cfg->config_data, info.superframeSize, info.framesInSuperframe, info.frameSamples);
if (cfg->channels && cfg->channels != info.channels) {
VGM_LOG("ATRAC9: channels in header %i vs config %i don't match\n", cfg->channels, info.channels);
if (cfg->channels && cfg->channels != data->info.channels) {
VGM_LOG("ATRAC9: channels in header %i vs config %i don't match\n", cfg->channels, data->info.channels);
goto fail; /* unknown multichannel layout */
}
/* must hold at least one superframe and its samples */
data->data_buffer_size = info.superframeSize;
data->data_buffer_size = data->info.superframeSize;
data->data_buffer = calloc(sizeof(uint8_t), data->data_buffer_size);
data->sample_buffer = calloc(sizeof(sample), info.channels * info.frameSamples * info.framesInSuperframe);
data->sample_buffer = calloc(sizeof(sample), data->info.channels * data->info.frameSamples * data->info.framesInSuperframe);
data->samples_to_discard = cfg->encoder_delay;
@ -100,31 +101,28 @@ void decode_atrac9(VGMSTREAM *vgmstream, sample * outbuf, int32_t samples_to_do,
int bytes_used = 0;
uint8_t *buffer = data->data_buffer;
size_t bytes;
Atrac9CodecInfo info = {0};
data->samples_used = 0;
/* ATRAC9 is made of decodable superframes with several sub-frames. AT9 config data gives
* superframe size, number of frames and samples (~100-200 bytes and ~256/1024 samples). */
status = Atrac9GetCodecInfo(data->handle, &info);
if (status < 0) goto decode_fail;
/* read one raw block (superframe) and advance offsets */
bytes = read_streamfile(data->data_buffer,stream->offset, info.superframeSize,stream->streamfile);
bytes = read_streamfile(data->data_buffer,stream->offset, data->info.superframeSize,stream->streamfile);
if (bytes != data->data_buffer_size) {
VGM_LOG("ATRAC9: read %x vs expected %x bytes at %lx\n", bytes, info.superframeSize, stream->offset);
VGM_LOG("ATRAC9: read %x vs expected %x bytes at %lx\n", bytes, data->info.superframeSize, stream->offset);
goto decode_fail;
}
stream->offset += bytes;
/* decode all frames in the superframe block */
for (iframe = 0; iframe < info.framesInSuperframe; iframe++) {
for (iframe = 0; iframe < data->info.framesInSuperframe; iframe++) {
status = Atrac9Decode(data->handle, buffer, data->sample_buffer + data->samples_filled*channels, &bytes_used);
if (status < 0) goto decode_fail;
buffer += bytes_used;
data->samples_filled += info.frameSamples;
data->samples_filled += data->info.frameSamples;
}
}
}
@ -162,7 +160,7 @@ void reset_atrac9(VGMSTREAM *vgmstream) {
data->samples_used = 0;
data->samples_filled = 0;
data->samples_to_discard = 0;
data->samples_to_discard = data->config.encoder_delay;
return;
@ -176,12 +174,43 @@ void seek_atrac9(VGMSTREAM *vgmstream, int32_t num_sample) {
reset_atrac9(vgmstream);
data->samples_to_discard = num_sample;
data->samples_to_discard += data->config.encoder_delay;
/* find closest offset to desired sample, and samples to discard after that offset to reach loop */
{
int32_t seek_sample = data->config.encoder_delay + num_sample;
off_t seek_offset;
int32_t seek_discard;
int32_t superframe_samples = data->info.frameSamples * data->info.framesInSuperframe;
size_t superframe_number, superframe_back;
superframe_number = (seek_sample / superframe_samples); /* closest */
/* decoded frames affect each other slightly, so move offset back to make PCM stable
* and equivalent to a full discard loop */
superframe_back = 1; /* 1 seems enough (even when only 1 subframe in superframe) */
if (superframe_back > superframe_number)
superframe_back = superframe_number;
seek_discard = (seek_sample % superframe_samples) + (superframe_back * superframe_samples);
seek_offset = (superframe_number - superframe_back) * data->info.superframeSize;
data->samples_to_discard = seek_discard; /* already includes encoder delay */
if (vgmstream->loop_ch)
vgmstream->loop_ch[0].offset = vgmstream->loop_ch[0].channel_start_offset + seek_offset;
}
#if 0
//old full discard loop
{
data->samples_to_discard = num_sample;
data->samples_to_discard += data->config.encoder_delay;
/* loop offsets are set during decode; force them to stream start so discard works */
if (vgmstream->loop_ch)
vgmstream->loop_ch[0].offset = vgmstream->loop_ch[0].channel_start_offset;
}
#endif
/* loop offsets are set during decode; force them to stream start so discard works */
if (vgmstream->loop_ch)
vgmstream->loop_ch[0].offset = vgmstream->loop_ch[0].channel_start_offset;
}
void free_atrac9(atrac9_codec_data *data) {
@ -195,16 +224,7 @@ void free_atrac9(atrac9_codec_data *data) {
size_t atrac9_bytes_to_samples(size_t bytes, atrac9_codec_data *data) {
Atrac9CodecInfo info = {0};
int status;
status = Atrac9GetCodecInfo(data->handle, &info);
if (status < 0) goto fail;
return bytes / info.superframeSize * (info.frameSamples * info.framesInSuperframe);
fail:
return 0;
return bytes / data->info.superframeSize * (data->info.frameSamples * data->info.framesInSuperframe);
}
#if 0 //not needed (for now)