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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2005 by Nick Lanham
*
* All files in this archive are subject to the GNU General Public License.
* See the file COPYING in the source tree root for full license agreement.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "autoconf.h"
#ifdef ROCKBOX_HAS_SIMSOUND /* play sound in sim enabled */
#include <stdlib.h>
#include <stdbool.h>
#include <memory.h>
#include "sound.h"
#include "SDL.h"
static bool pcm_playing;
static bool pcm_paused;
static Uint8* pcm_data;
static Uint32 pcm_data_size;
extern bool debug_audio;
static void sdl_dma_start(const void *addr, size_t size)
{
pcm_playing = true;
SDL_LockAudio();
pcm_data = (Uint8 *) addr;
pcm_data_size = size;
SDL_UnlockAudio();
SDL_PauseAudio(0);
}
static void sdl_dma_stop()
{
pcm_playing = false;
SDL_PauseAudio(1);
pcm_paused = false;
}
static void (*callback_for_more)(unsigned char**, size_t*) = NULL;
void pcm_play_data(void (*get_more)(unsigned char** start, size_t* size),
unsigned char* start, size_t size)
{
callback_for_more = get_more;
if (!(start && size)) {
if (get_more)
get_more(&start, &size);
else
return;
}
if (start && size) {
sdl_dma_start(start, size);
}
}
size_t pcm_get_bytes_waiting(void)
{
return pcm_data_size;
}
void pcm_mute(bool mute)
{
(void) mute;
}
void pcm_play_stop(void)
{
if (pcm_playing) {
sdl_dma_stop();
}
}
void pcm_play_pause(bool play)
{
Uint32 next_size;
Uint8 *next_start;
if (!pcm_playing) {
return;
}
if(pcm_paused && play) {
if (pcm_get_bytes_waiting()) {
printf("unpause\n");
SDL_PauseAudio(0);
} else {
printf("unpause, no data waiting\n");
void (*get_more)(unsigned char**, size_t*) = callback_for_more;
if (get_more) {
get_more(&next_start, &next_size);
}
if (next_start && next_size) {
sdl_dma_start(next_start, next_size);
} else {
sdl_dma_stop();
printf("unpause attempted, no data\n");
}
}
} else if(!pcm_paused && !play) {
printf("pause\n");
SDL_PauseAudio(1);
}
pcm_paused = !play;
}
bool pcm_is_paused(void)
{
return pcm_paused;
}
bool pcm_is_playing(void)
{
return pcm_playing;
}
Uint8 overflow[8192];
Uint32 overflow_amount = 0;
void sdl_audio_callback(void *udata, Uint8 *stream, int len)
{
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 > 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_played, 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 {
pcm_data_size = 0;
pcm_data = NULL;
/* No data, try and get some */
callback_for_more(&pcm_data, &pcm_data_size);
}
}
int pcm_init(void)
{
SDL_AudioSpec fmt;
FILE *debug = NULL;
if (debug_audio) {
debug = fopen("audiodebug.raw", "wb");
}
/* Set 16-bit stereo audio at 44Khz */
fmt.freq = 44100;
fmt.format = AUDIO_S16SYS;
fmt.channels = 2;
fmt.samples = 2048;
fmt.callback = sdl_audio_callback;
fmt.userdata = debug;
/* Open the audio device and start playing sound! */
if(SDL_OpenAudio(&fmt, NULL) < 0) {
fprintf(stderr, "Unable to open audio: %s\n", SDL_GetError());
return -1;
}
sdl_dma_stop();
return 0;
}
#endif /* ROCKBOX_HAS_SIMSOUND */
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