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GBAAudioResampleNN returns how many (destination) samples were read

This commit is contained in:
Jeffrey Pfau 2014-01-29 00:43:57 -08:00
parent a79a592c1e
commit 5fde0d8c35
2 changed files with 7 additions and 4 deletions
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9
src/gba/gba-audio.c
View File

@ -420,13 +420,14 @@ unsigned GBAAudioCopy(struct GBAAudio* audio, void* left, void* right, unsigned
return read; return read;
} }
void GBAAudioResampleNN(struct GBAAudio* audio, float ratio, float* drift, struct GBAStereoSample* output, unsigned nSamples) { unsigned GBAAudioResampleNN(struct GBAAudio* audio, float ratio, float* drift, struct GBAStereoSample* output, unsigned nSamples) {
int32_t left[GBA_AUDIO_SAMPLES]; int32_t left[GBA_AUDIO_SAMPLES];
int32_t right[GBA_AUDIO_SAMPLES]; int32_t right[GBA_AUDIO_SAMPLES];
// toRead is in GBA samples // toRead is in GBA samples
// TODO: Do this with fixed-point math // TODO: Do this with fixed-point math
unsigned toRead = ceilf(nSamples / ratio); unsigned toRead = ceilf(nSamples / ratio);
unsigned totalRead = 0;
while (nSamples) { while (nSamples) {
unsigned currentRead = GBA_AUDIO_SAMPLES; unsigned currentRead = GBA_AUDIO_SAMPLES;
if (currentRead > toRead) { if (currentRead > toRead) {
@ -441,18 +442,20 @@ void GBAAudioResampleNN(struct GBAAudio* audio, float ratio, float* drift, struc
output->left = left[i]; output->left = left[i];
output->right = right[i]; output->right = right[i];
++output; ++output;
++totalRead;
--nSamples; --nSamples;
*drift -= 1.f; *drift -= 1.f;
if (!nSamples) { if (!nSamples) {
return; return totalRead;
} }
} }
} }
if (read < currentRead) { if (read < currentRead) {
memset(output, 0, nSamples * sizeof(struct GBAStereoSample)); memset(output, 0, nSamples * sizeof(struct GBAStereoSample));
return; break;
} }
} }
return totalRead;
} }
static int32_t _updateSquareChannel(struct GBAAudioSquareControl* control, int duty) { static int32_t _updateSquareChannel(struct GBAAudioSquareControl* control, int duty) {

2
src/gba/gba-audio.h
View File

@ -234,7 +234,7 @@ void GBAAudioWriteFIFO(struct GBAAudio* audio, int address, uint32_t value);
void GBAAudioSampleFIFO(struct GBAAudio* audio, int fifoId, int32_t cycles); void GBAAudioSampleFIFO(struct GBAAudio* audio, int fifoId, int32_t cycles);
unsigned GBAAudioCopy(struct GBAAudio* audio, void* left, void* right, unsigned nSamples); unsigned GBAAudioCopy(struct GBAAudio* audio, void* left, void* right, unsigned nSamples);
void GBAAudioResampleNN(struct GBAAudio*, float ratio, float* drift, struct GBAStereoSample* output, unsigned nSamples); unsigned GBAAudioResampleNN(struct GBAAudio*, float ratio, float* drift, struct GBAStereoSample* output, unsigned nSamples);
struct GBASerializedState; struct GBASerializedState;
void GBAAudioSerialize(const struct GBAAudio* audio, struct GBASerializedState* state); void GBAAudioSerialize(const struct GBAAudio* audio, struct GBASerializedState* state);