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Don't crash the simulator when the pcm callback runs out of data.

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git-svn-id: svn://svn.rockbox.org/rockbox/trunk@8998 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Jens Arnold 2006-03-11 10:22:20 +00:00
parent dae698cad4
commit 4bd8715449
1 changed files with 32 additions and 35 deletions
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67
uisimulator/sdl/sound.c
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@ -24,6 +24,7 @@
#include <stdlib.h>
#include <stdbool.h>
#include <memory.h>
#include "debug.h"
#include "kernel.h"
#include "sound.h"
#include "SDL.h"
@ -209,54 +210,50 @@ void pcm_calculate_peaks(int *left, int *right)
void sdl_audio_callback(void *udata, Uint8 *stream, int len)
{
Uint32 pcm_data_played, need_to_play;
Uint32 have_now;
FILE *debug = (FILE *)udata;
/* At all times we need to write a full 'len' bytes to stream. */
if (pcm_data_size > 0) {
/* We have some PCM data to play. Play as much as we can. */
have_now = (((Uint32)len) > pcm_data_size) ? pcm_data_size : (Uint32)len;
pcm_data_played = (((Uint32)len) > pcm_data_size) ? pcm_data_size : (Uint32)len;
memcpy(stream, pcm_data, pcm_data_played);
memcpy(stream, pcm_data, have_now);
if (debug != NULL) {
fwrite(pcm_data, sizeof(Uint8), pcm_data_played, debug);
fwrite(pcm_data, sizeof(Uint8), have_now, 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 */
stream += have_now;
len -= have_now;
pcm_data += have_now;
pcm_data_size -= have_now;
}
while (len > 0)
{
if (callback_for_more) {
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 {
pcm_data = NULL;
pcm_data_size = 0;
}
} else {
pcm_data_size = 0;
pcm_data = NULL;
if (pcm_data_size > 0) {
have_now = (((Uint32)len) > pcm_data_size) ? pcm_data_size : (Uint32)len;
/* No data, try and get some */
callback_for_more(&pcm_data, &pcm_data_size);
memcpy(stream, pcm_data, have_now);
if (debug != NULL) {
fwrite(pcm_data, sizeof(Uint8), have_now, debug);
}
stream += have_now;
len -= have_now;
pcm_data += have_now;
pcm_data_size -= have_now;
} else {
DEBUGF("sdl_audio_callback: No Data.\n");
sdl_dma_stop();
break;
}
}
}