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Handle S8 and U16 samples from SDL_sound

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This commit is contained in:
Chris Robinson 2013-06-30 08:16:49 -07:00
parent c4492f88ee
commit 68988ab93c
2 changed files with 72 additions and 4 deletions
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72
src/sound/oalsdlsound.cpp
View file

@ -182,7 +182,8 @@ bool OpenALSoundStream::SetupSource()
OpenALSoundStream::OpenALSoundStream(OpenALSoundRenderer *renderer)
: Renderer(renderer), Sample(NULL), Source(0), Playing(false),
Looping(false), Buffers(4), SampleRate(0), Format(0),
NeedSwab(false), Volume(1.f)
NeedSwab(false), NeedS8Conv(false), NeedS16Conv(false),
Volume(1.f)
{
for(size_t i = 0;i < Buffers.size();i++)
Buffers[i] = 0;
@ -328,6 +329,19 @@ void *OpenALSoundStream::GetData(size_t bytes)
*(samples++) = ((smp>>8)&0x00FF) | ((smp<<8)*0xFF00);
}
}
if(NeedS8Conv)
{
char *samples = reinterpret_cast<char*>(data);
for(size_t i = 0;i < bytes;i++)
samples[i] = samples[i]^0x80;
}
if(NeedS16Conv)
{
short *samples = reinterpret_cast<short*>(data);
size_t count = bytes >> 1;
for(size_t i = 0;i < count;i++)
samples[i] = samples[i]^0x8000;
}
return data;
}
@ -337,7 +351,16 @@ bool OpenALSoundStream::InitSample()
SampleRate = Sample->actual.rate;
Format = AL_NONE;
if(Sample->actual.format == AUDIO_U8)
if(Sample->actual.format == AUDIO_S8)
{
NeedS8Conv = true;
if(Sample->actual.channels == 1)
Format = AL_FORMAT_MONO8;
else if(Sample->actual.channels == 2)
Format = AL_FORMAT_STEREO8;
smpsize = 1 * Sample->actual.channels;
}
else if(Sample->actual.format == AUDIO_U8)
{
if(Sample->actual.channels == 1)
Format = AL_FORMAT_MONO8;
@ -354,6 +377,16 @@ bool OpenALSoundStream::InitSample()
Format = AL_FORMAT_STEREO16;
smpsize = 1 * Sample->actual.channels;
}
else if(Sample->actual.format == AUDIO_U16LSB || Sample->actual.format == AUDIO_U16MSB)
{
NeedS16Conv = true;
NeedSwab = (Sample->actual.format != AUDIO_U16SYS);
if(Sample->actual.channels == 1)
Format = AL_FORMAT_MONO16;
else if(Sample->actual.channels == 2)
Format = AL_FORMAT_STEREO16;
smpsize = 1 * Sample->actual.channels;
}
if(Format == AL_NONE)
{
@ -426,7 +459,7 @@ bool OpenALSoundStream::Init(const BYTE *data, unsigned int datalen)
Decoder::Decoder(const void* data, unsigned int datalen)
: Sample(NULL), NeedSwab(false)
: Sample(NULL), NeedSwab(false), NeedS8Conv(false), NeedS16Conv(false)
{
Sample = Sound_NewSample(SDL_RWFromConstMem(data, datalen), NULL, NULL, 65536);
}
@ -441,7 +474,15 @@ Decoder::~Decoder()
bool Decoder::GetFormat(ALenum *format, ALuint *rate)
{
ALenum fmt = AL_NONE;
if(Sample->actual.format == AUDIO_U8)
if(Sample->actual.format == AUDIO_S8)
{
NeedS8Conv = true;
if(Sample->actual.channels == 1)
fmt = AL_FORMAT_MONO8;
else if(Sample->actual.channels == 2)
fmt = AL_FORMAT_STEREO8;
}
else if(Sample->actual.format == AUDIO_U8)
{
if(Sample->actual.channels == 1)
fmt = AL_FORMAT_MONO8;
@ -456,6 +497,15 @@ bool Decoder::GetFormat(ALenum *format, ALuint *rate)
else if(Sample->actual.channels == 2)
fmt = AL_FORMAT_STEREO16;
}
else if(Sample->actual.format == AUDIO_U16LSB || Sample->actual.format == AUDIO_U16MSB)
{
NeedS16Conv = true;
NeedSwab = (Sample->actual.format != AUDIO_U16SYS);
if(Sample->actual.channels == 1)
fmt = AL_FORMAT_MONO16;
else if(Sample->actual.channels == 2)
fmt = AL_FORMAT_STEREO16;
}
if(fmt == AL_NONE)
{
@ -489,6 +539,20 @@ void* Decoder::GetData(ALsizei *size)
}
}
if(NeedS8Conv)
{
char *samples = reinterpret_cast<char*>(data);
for(size_t i = 0;i < got;i++)
samples[i] = samples[i]^0x80;
}
if(NeedS16Conv)
{
short *samples = reinterpret_cast<short*>(data);
size_t count = got >> 1;
for(size_t i = 0;i < count;i++)
samples[i] = samples[i]^0x8000;
}
*size = got;
return data;
}

4
src/sound/oalsdlsound.h
View file

@ -22,6 +22,8 @@ class OpenALSoundStream : public SoundStream
ALenum Format;
bool NeedSwab;
bool NeedS8Conv;
bool NeedS16Conv;
void *GetData(size_t bytes);
// General methods
@ -54,6 +56,8 @@ class Decoder
{
Sound_Sample *Sample;
bool NeedSwab;
bool NeedS8Conv;
bool NeedS16Conv;
public:
Decoder(const void *data, unsigned int datalen);