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Better (i.e. working) sound in the SDL sim in Windows.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8793 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Dan Everton 2006-02-22 22:45:10 +00:00
parent a234ed8ce2
commit 4f54dbd91f
1 changed files with 44 additions and 31 deletions
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75
uisimulator/sdl/sound.c
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@ -31,7 +31,7 @@ static bool pcm_playing;
static bool pcm_paused;
static Uint8* pcm_data;
static int pcm_data_size;
static Uint32 pcm_data_size;
extern bool debug_audio;
@ -95,7 +95,7 @@ void pcm_play_stop(void)
void pcm_play_pause(bool play)
{
int next_size;
Uint32 next_size;
Uint8 *next_start;
if (!pcm_playing) {
@ -128,7 +128,7 @@ void pcm_play_pause(bool play)
SDL_PauseAudio(1);
}
pcm_paused = !play;
}
@ -142,47 +142,60 @@ bool pcm_is_playing(void)
return pcm_playing;
}
char overflow[8192];
int overflow_amount = 0;
Uint8 overflow[8192];
Uint32 overflow_amount = 0;
void sdl_audio_callback(void *udata, Uint8 *stream, int len)
{
int datalen, offset;
Uint32 pcm_data_played, need_to_play;
FILE *debug = (FILE *)udata;
/* At all times we need to write a full 'len' bytes to stream. */
if (pcm_data_size <= len) {
/* Play what we have */
memcpy(stream, pcm_data, pcm_data_size);
if (pcm_data_size > 0) {
/* We have some PCM data to play. Play as much as we can. */
pcm_data_played = (((Uint32)len) > pcm_data_size) ? pcm_data_size : len;
memcpy(stream, pcm_data, pcm_data_played);
if (debug != NULL) {
fwrite(pcm_data, sizeof(Uint8), pcm_data_size, debug);
fwrite(pcm_data, sizeof(Uint8), pcm_data_played, debug);
}
offset = pcm_data_size;
datalen = len - pcm_data_size;
/* Get some more */
callback_for_more(&pcm_data, &pcm_data_size);
/* Play enough of that to keep the audio buffer full */
memcpy(stream + offset, pcm_data, datalen);
if (debug != NULL) {
fwrite(pcm_data, sizeof(Uint8), datalen, debug);
stream += pcm_data_played;
need_to_play = len - pcm_data_played;
pcm_data += pcm_data_played;
pcm_data_size -= pcm_data_played;
while(need_to_play > 0) {
/* Loop until we have written enough */
callback_for_more(&pcm_data, &pcm_data_size);
if (pcm_data_size > 0) {
/* We got more data */
pcm_data_played = (need_to_play > pcm_data_size) ? pcm_data_size : need_to_play;
memcpy(stream, pcm_data, pcm_data_played);
if (debug != NULL) {
fwrite(pcm_data, sizeof(Uint8), pcm_data_played, debug);
}
stream += pcm_data_played;
need_to_play -= pcm_data_played;
pcm_data += pcm_data_played;
pcm_data_size -= pcm_data_played;
}
}
} else {
datalen = len;
memcpy(stream, pcm_data, len);
if (debug != NULL) {
fwrite(pcm_data, sizeof(Uint8), len, debug);
}
}
pcm_data_size = 0;
pcm_data = NULL;
pcm_data_size -= datalen;
pcm_data += datalen;
/* No data, try and get some */
callback_for_more(&pcm_data, &pcm_data_size);
}
}
int pcm_init(void)
@ -198,7 +211,7 @@ int pcm_init(void)
fmt.freq = 44100;
fmt.format = AUDIO_S16SYS;
fmt.channels = 2;
fmt.samples = 512;
fmt.samples = 2048;
fmt.callback = sdl_audio_callback;
fmt.userdata = debug;