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some cleanup; moved around some stuff, preparing to unify more code of ChannelMP3CDMusic and ChannelMP3

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svn-id: r9274
This commit is contained in:
Max Horn 2003-07-29 02:21:07 +00:00
parent bb35528f43
commit 04843469eb
1 changed files with 39 additions and 34 deletions
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73
sound/mixer.cpp
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@ -128,6 +128,7 @@ protected:
struct mad_synth _synth;
uint32 _posInFrame;
uint32 _size;
bool _initialized;
public:
ChannelMP3Common(SoundMixer *mixer, PlayingSoundHandle *handle);
@ -149,7 +150,6 @@ class ChannelMP3CDMusic : public ChannelMP3Common {
uint32 _bufferSize;
mad_timer_t _duration;
File *_file;
bool _initialized;
public:
ChannelMP3CDMusic(SoundMixer *mixer, PlayingSoundHandle *handle, File *file, mad_timer_t duration);
@ -920,6 +920,8 @@ ChannelMP3Common::ChannelMP3Common(SoundMixer *mixer, PlayingSoundHandle *handle
#endif
mad_frame_init(&_frame);
mad_synth_init(&_synth);
_initialized = false;
}
ChannelMP3Common::~ChannelMP3Common() {
@ -930,29 +932,6 @@ ChannelMP3Common::~ChannelMP3Common() {
mad_stream_finish(&_stream);
}
ChannelMP3::ChannelMP3(SoundMixer *mixer, PlayingSoundHandle *handle, void *sound, uint size, byte flags)
: ChannelMP3Common(mixer, handle) {
_posInFrame = 0xFFFFFFFF;
_position = 0;
_size = size;
_ptr = (byte *)sound;
_releasePtr = (flags & SoundMixer::FLAG_AUTOFREE) != 0;
/* This variable is the number of samples to cut at the start of the MP3
file. This is needed to have lip-sync as the MP3 file have some miliseconds
of blank at the start (as, I suppose, the MP3 compression algorithm need to
have some silence at the start to really be efficient and to not distort
too much the start of the sample).
This value was found by experimenting out. If you recompress differently your
.SO3 file, you may have to change this value.
When using Lame, it seems that the sound starts to have some volume about 50 ms
from the start of the sound => we skip about 2 frames (at 22.05 khz).
*/
_silenceCut = 576 * 2;
}
static inline int scale_sample(mad_fixed_t sample) {
/* round */
sample += (1L << (MAD_F_FRACBITS - 16));
@ -967,9 +946,37 @@ static inline int scale_sample(mad_fixed_t sample) {
return sample >> (MAD_F_FRACBITS + 1 - 16);
}
ChannelMP3::ChannelMP3(SoundMixer *mixer, PlayingSoundHandle *handle, void *sound, uint size, byte flags)
: ChannelMP3Common(mixer, handle) {
_posInFrame = 0xFFFFFFFF;
_position = 0;
_size = size;
_ptr = (byte *)sound;
_releasePtr = (flags & SoundMixer::FLAG_AUTOFREE) != 0;
/* This variable is the number of samples to cut at the start of the MP3
file. This is needed to have lip-sync as the MP3 file have some miliseconds
of blank at the start (as, I suppose, the MP3 compression algorithm needs to
have some silence at the start to really be efficient and to not distort
too much the start of the sample).
This value was found by experimenting out. If you recompress differently your
.SO3 file, you may have to change this value.
When using Lame, it seems that the sound starts to have some volume about 50 ms
from the start of the sound => we skip about 2 frames (at 22.05 khz).
*/
_silenceCut = 576 * 2;
}
void ChannelMP3::mix(int16 *data, uint len) {
const int volume = _mixer->getVolume();
if (!_initialized) {
// TODO: instead of using _silenceCut, skip first two frames like
// it is done in ChannelMP3CDMusic::mix()
}
while (1) {
/* Skip _silence_cut a the start */
@ -1024,7 +1031,6 @@ ChannelMP3CDMusic::ChannelMP3CDMusic(SoundMixer *mixer, PlayingSoundHandle *hand
: ChannelMP3Common(mixer, handle) {
_file = file;
_duration = duration;
_initialized = false;
_bufferSize = MP3CD_BUFFERING_SIZE;
_ptr = (byte *)malloc(MP3CD_BUFFERING_SIZE);
_releasePtr = true;
@ -1032,10 +1038,9 @@ ChannelMP3CDMusic::ChannelMP3CDMusic(SoundMixer *mixer, PlayingSoundHandle *hand
void ChannelMP3CDMusic::mix(int16 *data, uint len) {
mad_timer_t frame_duration;
int volume = _mixer->getMusicVolume();
const int volume = _mixer->getMusicVolume();
if (!_initialized) {
int skip_loop;
// just skipped
memset(_ptr, 0, _bufferSize);
_size = _file->read(_ptr, _bufferSize);
@ -1046,14 +1051,13 @@ void ChannelMP3CDMusic::mix(int16 *data, uint len) {
}
// Resync
mad_stream_buffer(&_stream, _ptr, _size);
skip_loop = 2;
// Skip the first two frames (see ChannelMP3::ChannelMP3 for an explanation)
int skip_loop = 2;
while (skip_loop != 0) {
if (mad_frame_decode(&_frame, &_stream) == 0) {
/* Do not decrease duration - see if it's a problem */
skip_loop--;
if (skip_loop == 0) {
mad_synth_frame(&_synth, &_frame);
}
} else {
if (!MAD_RECOVERABLE(_stream.error)) {
debug(1, "Unrecoverable error while skipping !");
@ -1062,6 +1066,8 @@ void ChannelMP3CDMusic::mix(int16 *data, uint len) {
}
}
}
mad_synth_frame(&_synth, &_frame);
// We are supposed to be in synch
mad_frame_mute(&_frame);
mad_synth_mute(&_synth);
@ -1106,14 +1112,13 @@ void ChannelMP3CDMusic::mix(int16 *data, uint len) {
int not_decoded;
if (!_stream.next_frame) {
memset(_ptr, 0, _bufferSize + MAD_BUFFER_GUARD);
_size = _file->read(_ptr, _bufferSize);
not_decoded = 0;
memset(_ptr, 0, _bufferSize + MAD_BUFFER_GUARD);
} else {
not_decoded = _stream.bufend - _stream.next_frame;
memcpy(_ptr, _stream.next_frame, not_decoded);
_size = _file->read(_ptr + not_decoded, _bufferSize - not_decoded);
}
_size = _file->read(_ptr + not_decoded, _bufferSize - not_decoded);
if (_size <= 0) {
return;
}