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VGMStream: Correctly implement mixing support and output channel reporting for downmixes

CQTexperiment
Christopher Snowhill 2021-10-02 18:38:23 -07:00
parent 9e6199b108
commit cbf20dab08
1 changed files with 32 additions and 6 deletions
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38
Plugins/vgmstream/vgmstream/VGMDecoder.m
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@ -13,6 +13,8 @@
#include <stdlib.h>
#define MAX_BUFFER_SAMPLES ((int)2048)
static NSString* get_description_tag(const char* description, const char *tag, char delimiter) {
// extract a "tag" from the description string
if (!delimiter) delimiter = '\n';
@ -59,11 +61,16 @@ static NSString* get_description_tag(const char* description, const char *tag, c
vcfg.ignore_loop = 0;
vgmstream_apply_config(stream, &vcfg);
int output_channels = stream->channels;
vgmstream_mixing_autodownmix(stream, 6);
vgmstream_mixing_enable(stream, MAX_BUFFER_SAMPLES, NULL, &output_channels);
int track_num = [[url fragment] intValue];
int sampleRate = stream->sample_rate;
int channels = stream->channels;
int channels = output_channels;
long totalFrames = vgmstream_get_samples(stream);
int bitrate = get_vgmstream_average_bitrate(stream);
@ -253,7 +260,10 @@ static NSString* get_description_tag(const char* description, const char *tag, c
if ( !stream )
return NO;
int output_channels = stream->channels;
vgmstream_mixing_autodownmix(stream, 6);
vgmstream_mixing_enable(stream, MAX_BUFFER_SAMPLES, NULL, &output_channels);
canPlayForever = stream->loop_flag;
if (canPlayForever) {
@ -275,7 +285,7 @@ static NSString* get_description_tag(const char* description, const char *tag, c
vgmstream_apply_config(stream, &vcfg);
sampleRate = stream->sample_rate;
channels = stream->channels;
channels = output_channels;
totalFrames = vgmstream_get_samples(stream);
framesRead = 0;
@ -305,6 +315,7 @@ static NSString* get_description_tag(const char* description, const char *tag, c
- (int)readAudio:(void *)buf frames:(UInt32)frames
{
UInt32 framesMax = frames;
UInt32 framesDone = 0;
if (canPlayForever) {
BOOL repeatone = IsRepeatOneSet();
@ -320,15 +331,30 @@ static NSString* get_description_tag(const char* description, const char *tag, c
if (frames > framesMax)
frames = 0; // integer overflow?
if (frames) {
while (frames) {
sample sample_buffer[MAX_BUFFER_SAMPLES * VGMSTREAM_MAX_CHANNELS];
UInt32 frames_to_do = frames;
if (frames_to_do > MAX_BUFFER_SAMPLES)
frames_to_do = MAX_BUFFER_SAMPLES;
render_vgmstream( sample_buffer, frames_to_do, stream );
framesRead += frames_to_do;
framesDone += frames_to_do;
sample * sbuf = (sample *) buf;
render_vgmstream( sbuf, frames, stream );
memcpy(sbuf, sample_buffer, frames_to_do * channels * sizeof(sbuf[0]));
framesRead += frames;
sbuf += frames_to_do * channels;
buf = (void *)sbuf;
frames -= frames_to_do;
}
return frames;
return framesDone;
}
- (long)seek:(long)frame