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https://github.com/dborth/snes9xgx.git
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add logic to update the playback rate dynamically
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babf402d01
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@ -39,43 +39,51 @@ extern int ConfigRequested;
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static u8 soundbuffer[BUFFERCOUNT][AUDIOBUFFER] __attribute__ ((__aligned__ (32)));
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static u8 soundbuffer[BUFFERCOUNT][AUDIOBUFFER] __attribute__ ((__aligned__ (32)));
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static int playab = 0;
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static int playab = 0;
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static int nextab = 0;
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static int nextab = 0;
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int available = 0;
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static int unplayed = 0;
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static inline void updateAvailable(int diff) {
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static inline void updateUnplayed(int diff) {
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available += diff;
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unplayed += diff;
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if(available < 0) {
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if(unplayed < 0) {
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available = 0;
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unplayed = 0;
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}
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}
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else if(available > BUFFERCOUNT-1) {
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else if(unplayed > BUFFERCOUNT-1) {
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available = BUFFERCOUNT-1;
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unplayed = BUFFERCOUNT-1;
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}
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}
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}
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}
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static void DMACallback () {
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static void DMACallback () {
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if (!ScreenshotRequested && !ConfigRequested) {
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if (!ScreenshotRequested && !ConfigRequested) {
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updateUnplayed(-1);
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AUDIO_InitDMA ((u32) soundbuffer[playab], AUDIOBUFFER);
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AUDIO_InitDMA ((u32) soundbuffer[playab], AUDIOBUFFER);
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updateAvailable(-1);
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playab = (playab + 1) % BUFFERCOUNT;
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playab = (playab + 1) % BUFFERCOUNT;
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}
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}
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}
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}
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static void S9xAudioCallback (void *data) {
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static void S9xAudioCallback (void *data) {
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//S9xUpdateDynamicRate(); // TODO: what arguments should be passed here?
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double rate = 1.0;
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if(unplayed > 8) {
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rate = 1.005;
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}
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else if(unplayed < 4) {
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rate = 0.995;
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}
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S9xUpdateDynamicRate(rate);
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S9xFinalizeSamples();
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S9xFinalizeSamples();
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int availableSamples = S9xGetSampleCount();
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if (ScreenshotRequested || ConfigRequested) {
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if (ScreenshotRequested || ConfigRequested) {
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AUDIO_StopDMA();
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AUDIO_StopDMA();
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}
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}
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else if(availableSamples >= SAMPLES_TO_PROCESS) {
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else if(S9xGetSampleCount() >= SAMPLES_TO_PROCESS) {
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nextab = (nextab + 1) % BUFFERCOUNT;
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updateAvailable(1);
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S9xMixSamples (soundbuffer[nextab], SAMPLES_TO_PROCESS);
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S9xMixSamples (soundbuffer[nextab], SAMPLES_TO_PROCESS);
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DCFlushRange (soundbuffer[nextab], AUDIOBUFFER);
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DCFlushRange (soundbuffer[nextab], AUDIOBUFFER);
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updateUnplayed(1);
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nextab = (nextab + 1) % BUFFERCOUNT;
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if(playab == -1) {
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if(playab == -1) {
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if(available > 2) {
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if(unplayed > 2) {
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playab = 0;
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playab = 0;
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AUDIO_StartDMA();
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AUDIO_StartDMA();
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}
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}
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@ -150,7 +158,7 @@ void ShutdownAudio()
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void
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void
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AudioStart ()
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AudioStart ()
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{
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{
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available = 0;
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unplayed = 0;
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nextab = 0;
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nextab = 0;
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playab = -1;
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playab = -1;
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}
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}
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@ -465,12 +465,12 @@ void S9xSetSamplesAvailableCallback (apu_callback callback, void *data)
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spc::extra_data = data;
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spc::extra_data = data;
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}
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}
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void S9xUpdateDynamicRate (int avail, int buffer_size)
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void S9xUpdateDynamicRate (double rate)
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{
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{
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spc::dynamic_rate_multiplier = 1.0 + (Settings.DynamicRateLimit * (buffer_size - 2 * avail)) /
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if(spc::dynamic_rate_multiplier != rate) {
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(double)(1000 * buffer_size);
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spc::dynamic_rate_multiplier = rate;
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UpdatePlaybackRate();
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UpdatePlaybackRate();
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}
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}
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}
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void UpdatePlaybackRate (void)
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void UpdatePlaybackRate (void)
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@ -214,7 +214,7 @@ void S9xFinalizeSamples (void);
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void S9xClearSamples (void);
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void S9xClearSamples (void);
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bool8 S9xMixSamples (uint8 *, int);
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bool8 S9xMixSamples (uint8 *, int);
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void S9xSetSamplesAvailableCallback (apu_callback, void *);
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void S9xSetSamplesAvailableCallback (apu_callback, void *);
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void S9xUpdateDynamicRate (int, int);
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void S9xUpdateDynamicRate (double rate);
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extern SNES_SPC *spc_core;
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extern SNES_SPC *spc_core;
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