[Scummvm-cvs-logs] CVS: scummvm/saga sound.cpp,1.24,1.25 sound.h,1.17,1.18
Eugene Sandulenko
sev at users.sourceforge.net
Tue May 3 13:36:49 CEST 2005
Update of /cvsroot/scummvm/scummvm/saga
In directory sc8-pr-cvs1.sourceforge.net:/tmp/cvs-serv13088/saga
Modified Files:
sound.cpp sound.h
Log Message:
Moved Oki ADPCM aka VOX decoder from SAGA engine to common sound/ directory.
Implemented IMA ADPCM decoder.
Index: sound.cpp
===================================================================
RCS file: /cvsroot/scummvm/scummvm/saga/sound.cpp,v
retrieving revision 1.24
retrieving revision 1.25
diff -u -d -r1.24 -r1.25
--- sound.cpp 12 Mar 2005 18:55:42 -0000 1.24
+++ sound.cpp 3 May 2005 20:36:06 -0000 1.25
@@ -26,119 +26,12 @@
#include "sound/audiostream.h"
#include "sound/mixer.h"
+#include "sound/adpcm.h"
namespace Saga {
-#define BUFFER_SIZE 4096
-
-// Routines to convert 12 bit linear samples to the
-// Dialogic or Oki ADPCM coding format.
-class VOXInputStream : public AudioStream {
-private:
- const byte *_buf;
- uint32 _pos;
- uint32 _inputLen;
- bool _evenPos;
-
- struct adpcmStatus {
- int16 last;
- int16 stepIndex;
- } _status;
-
- int16 stepAdjust(byte);
- int16 adpcmDecode(byte);
-
-public:
- VOXInputStream(const byte *input, int inputLen);
- ~VOXInputStream() {};
-
- int readBuffer(int16 *buffer, const int numSamples);
-
- bool endOfData() const { return _pos >= _inputLen; }
- bool isStereo() const { return false; }
- int getRate() const { return 22050; }
-};
-
-
-VOXInputStream::VOXInputStream(const byte *input, int inputLen)
- : _buf(input), _pos(0), _inputLen(inputLen), _evenPos(true) {
-
- _status.last = 0;
- _status.stepIndex = 0;
-}
-
-int VOXInputStream::readBuffer(int16 *buffer, const int numSamples) {
- int samples = 0;
-
- while (samples < numSamples && !endOfData()) {
- const int len = MIN(numSamples - samples, (int) (_inputLen - _pos));
-
- // * 16 effectively converts 12-bit input to 16-bit output
- for (int i = 0; i < len; i++) {
- if (_evenPos)
- buffer[i] = adpcmDecode((_buf[_pos] >> 4) & 0x0f) * 16;
- else {
- buffer[i] = adpcmDecode(_buf[_pos] & 0x0f) * 16;
- _pos++;
- }
- _evenPos = !_evenPos;
- }
-
- samples += len;
- }
- return samples;
-}
-
-// adjust the step for use on the next sample.
-int16 VOXInputStream::stepAdjust(byte code) {
- static int16 adjusts[] = {-1, -1, -1, -1, 2, 4, 6, 8};
-
- return adjusts[code & 0x07];
-}
-
-static int16 stepSize[49] = { 16, 17, 19, 21, 23, 25, 28, 31, 34, 37, 41,
- 45, 50, 55, 60, 66, 73, 80, 88, 97, 107, 118, 130, 143, 157, 173,
- 190, 209, 230, 253, 279, 307, 337, 371, 408, 449, 494, 544, 598, 658,
- 724, 796, 876, 963, 1060, 1166, 1282, 1408, 1552 };
-
-// Decode Linear to ADPCM
-int16 VOXInputStream::adpcmDecode(byte code) {
- int16 diff, E, SS, samp;
-
- SS = stepSize[_status.stepIndex];
- E = SS/8;
- if (code & 0x01)
- E += SS/4;
- if (code & 0x02)
- E += SS/2;
- if (code & 0x04)
- E += SS;
- diff = (code & 0x08) ? -E : E;
- samp = _status.last + diff;
-
- // Clip the values to +/- 2^11 (supposed to be 12 bits)
- if(samp > 2048)
- samp = 2048;
- if(samp < -2048)
- samp = -2048;
-
- _status.last = samp;
- _status.stepIndex += stepAdjust(code);
- if(_status.stepIndex < 0)
- _status.stepIndex = 0;
- if(_status.stepIndex > 48)
- _status.stepIndex = 48;
-
- return samp;
-}
-
-AudioStream *makeVOXStream(const byte *input, int size) {
- AudioStream *audioStream = new VOXInputStream(input, size);
-
- return audioStream;
-}
Sound::Sound(SagaEngine *vm, SoundMixer *mixer, int enabled) :
- _vm(vm), _mixer(mixer), _enabled(enabled) {
+ _vm(vm), _mixer(mixer), _enabled(enabled), _voxStream(0) {
_soundInitialized = 1;
return;
@@ -149,6 +42,7 @@
return;
}
+ delete _voxStream;
_soundInitialized = 0;
}
@@ -220,7 +114,12 @@
int Sound::playVoxVoice(SOUNDBUFFER *buf) {
AudioStream *audioStream;
- audioStream = makeVOXStream(buf->s_buf, buf->s_buf_len);
+ if (_voxStream)
+ delete _voxStream;
+
+ _voxStream = new Common::MemoryReadStream(buf->s_buf, buf->s_buf_len);
+
+ audioStream = makeADPCMStream(*_voxStream, kADPCMOki);
_mixer->playInputStream(SoundMixer::kSFXSoundType, &_voiceHandle, audioStream);
return SUCCESS;
Index: sound.h
===================================================================
RCS file: /cvsroot/scummvm/scummvm/saga/sound.h,v
retrieving revision 1.17
retrieving revision 1.18
diff -u -d -r1.17 -r1.18
--- sound.h 12 Mar 2005 18:55:42 -0000 1.17
+++ sound.h 3 May 2005 20:36:06 -0000 1.18
@@ -71,6 +71,7 @@
SagaEngine *_vm;
SoundMixer *_mixer;
+ Common::MemoryReadStream *_voxStream;
SoundHandle _effectHandle;
SoundHandle _voiceHandle;
More information about the Scummvm-git-logs
mailing list