rockbox/firmware/target/hosted/sdl/pcm-sdl.c

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/***************************************************************************
* __________ __ ___.
* Open \______ \ ____ ____ | | _\_ |__ _______ ___
* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
* \/ \/ \/ \/ \/
* $Id$
*
* Copyright (C) 2005 by Nick Lanham
* Copyright (C) 2010 by Thomas Martitz
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* of the License, or (at your option) any later version.
*
* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
* KIND, either express or implied.
*
****************************************************************************/
#include "autoconf.h"
#include <stdlib.h>
#include <stdbool.h>
#include <SDL.h>
#include "config.h"
#include "debug.h"
#include "sound.h"
#include "audiohw.h"
#include "system.h"
#include "pcm.h"
#include "pcm_sampr.h"
/*#define LOGF_ENABLE*/
#include "logf.h"
#ifdef DEBUG
#include <stdio.h>
extern bool debug_audio;
#endif
static int sim_volume = 0;
#if CONFIG_CODEC == SWCODEC
static int cvt_status = -1;
static Uint8* pcm_data;
static size_t pcm_data_size;
static size_t pcm_sample_bytes;
static size_t pcm_channel_bytes;
static struct pcm_udata
{
Uint8 *stream;
Uint32 num_in;
Uint32 num_out;
#ifdef DEBUG
FILE *debug;
#endif
} udata;
static SDL_AudioSpec obtained;
static SDL_AudioCVT cvt;
void pcm_play_lock(void)
{
SDL_LockAudio();
}
void pcm_play_unlock(void)
{
SDL_UnlockAudio();
}
static void pcm_dma_apply_settings_nolock(void)
{
cvt_status = SDL_BuildAudioCVT(&cvt, AUDIO_S16SYS, 2, pcm_sampr,
obtained.format, obtained.channels, obtained.freq);
if (cvt_status < 0) {
cvt.len_ratio = (double)obtained.freq / (double)pcm_sampr;
}
}
void pcm_dma_apply_settings(void)
{
pcm_play_lock();
pcm_dma_apply_settings_nolock();
pcm_play_unlock();
}
void pcm_play_dma_start(const void *addr, size_t size)
{
pcm_dma_apply_settings_nolock();
pcm_data = (Uint8 *) addr;
pcm_data_size = size;
SDL_PauseAudio(0);
}
void pcm_play_dma_stop(void)
{
SDL_PauseAudio(1);
#ifdef DEBUG
if (udata.debug != NULL) {
fclose(udata.debug);
udata.debug = NULL;
DEBUGF("Audio debug file closed\n");
}
#endif
}
void pcm_play_dma_pause(bool pause)
{
if (pause)
SDL_PauseAudio(1);
else
SDL_PauseAudio(0);
}
size_t pcm_get_bytes_waiting(void)
{
return pcm_data_size;
}
static void write_to_soundcard(struct pcm_udata *udata)
{
#ifdef DEBUG
if (debug_audio && (udata->debug == NULL)) {
udata->debug = fopen("audiodebug.raw", "ab");
DEBUGF("Audio debug file open\n");
}
#endif
if (cvt.needed) {
Uint32 rd = udata->num_in;
Uint32 wr = (double)rd * cvt.len_ratio;
if (wr > udata->num_out) {
wr = udata->num_out;
rd = (double)wr / cvt.len_ratio;
if (rd > udata->num_in)
{
rd = udata->num_in;
wr = (double)rd * cvt.len_ratio;
}
}
if (wr == 0 || rd == 0)
{
udata->num_out = udata->num_in = 0;
return;
}
if (cvt_status > 0) {
cvt.len = rd * pcm_sample_bytes;
cvt.buf = (Uint8 *) malloc(cvt.len * cvt.len_mult);
memcpy(cvt.buf, pcm_data, cvt.len);
SDL_ConvertAudio(&cvt);
SDL_MixAudio(udata->stream, cvt.buf, cvt.len_cvt, sim_volume);
udata->num_in = cvt.len / pcm_sample_bytes;
udata->num_out = cvt.len_cvt / pcm_sample_bytes;
#ifdef DEBUG
if (udata->debug != NULL) {
fwrite(cvt.buf, sizeof(Uint8), cvt.len_cvt, udata->debug);
}
#endif
free(cvt.buf);
}
else {
/* Convert is bad, so do silence */
Uint32 num = wr*obtained.channels;
udata->num_in = rd;
udata->num_out = wr;
switch (pcm_channel_bytes)
{
case 1:
{
Uint8 *stream = udata->stream;
while (num-- > 0)
*stream++ = obtained.silence;
break;
}
case 2:
{
Uint16 *stream = (Uint16 *)udata->stream;
while (num-- > 0)
*stream++ = obtained.silence;
break;
}
}
#ifdef DEBUG
if (udata->debug != NULL) {
fwrite(udata->stream, sizeof(Uint8), wr, udata->debug);
}
#endif
}
} else {
udata->num_in = udata->num_out = MIN(udata->num_in, udata->num_out);
SDL_MixAudio(udata->stream, pcm_data,
udata->num_out * pcm_sample_bytes, sim_volume);
#ifdef DEBUG
if (udata->debug != NULL) {
fwrite(pcm_data, sizeof(Uint8), udata->num_out * pcm_sample_bytes,
udata->debug);
}
#endif
}
}
static void sdl_audio_callback(struct pcm_udata *udata, Uint8 *stream, int len)
{
logf("sdl_audio_callback: len %d, pcm %d\n", len, pcm_data_size);
udata->stream = stream;
/* Write what we have in the PCM buffer */
if (pcm_data_size > 0)
goto start;
/* Audio card wants more? Get some more then. */
while (len > 0) {
pcm_play_get_more_callback((void **)&pcm_data, &pcm_data_size);
start:
if (pcm_data_size != 0) {
udata->num_in = pcm_data_size / pcm_sample_bytes;
udata->num_out = len / pcm_sample_bytes;
write_to_soundcard(udata);
udata->num_in *= pcm_sample_bytes;
udata->num_out *= pcm_sample_bytes;
pcm_data += udata->num_in;
pcm_data_size -= udata->num_in;
udata->stream += udata->num_out;
len -= udata->num_out;
} else {
DEBUGF("sdl_audio_callback: No Data.\n");
break;
}
}
}
const void * pcm_play_dma_get_peak_buffer(int *count)
{
uintptr_t addr = (uintptr_t)pcm_data;
*count = pcm_data_size / 4;
return (void *)((addr + 2) & ~3);
}
#ifdef HAVE_RECORDING
void pcm_rec_lock(void)
{
}
void pcm_rec_unlock(void)
{
}
void pcm_rec_dma_init(void)
{
}
void pcm_rec_dma_close(void)
{
}
void pcm_rec_dma_start(void *start, size_t size)
{
(void)start;
(void)size;
}
void pcm_rec_dma_stop(void)
{
}
unsigned long pcm_rec_status(void)
{
return 0;
}
const void * pcm_rec_dma_get_peak_buffer(void)
{
return NULL;
}
#endif /* HAVE_RECORDING */
void pcm_play_dma_init(void)
{
if (SDL_InitSubSystem(SDL_INIT_AUDIO))
{
DEBUGF("Could not initialize SDL audio subsystem!\n");
return;
}
SDL_AudioSpec wanted_spec;
#ifdef DEBUG
udata.debug = NULL;
if (debug_audio) {
udata.debug = fopen("audiodebug.raw", "wb");
DEBUGF("Audio debug file open\n");
}
#endif
/* Set 16-bit stereo audio at 44Khz */
wanted_spec.freq = 44100;
wanted_spec.format = AUDIO_S16SYS;
wanted_spec.channels = 2;
wanted_spec.samples = 2048;
wanted_spec.callback =
(void (SDLCALL *)(void *userdata,
Uint8 *stream, int len))sdl_audio_callback;
wanted_spec.userdata = &udata;
/* Open the audio device and start playing sound! */
if(SDL_OpenAudio(&wanted_spec, &obtained) < 0) {
DEBUGF("Unable to open audio: %s\n", SDL_GetError());
return;
}
switch (obtained.format)
{
case AUDIO_U8:
case AUDIO_S8:
pcm_channel_bytes = 1;
break;
case AUDIO_U16LSB:
case AUDIO_S16LSB:
case AUDIO_U16MSB:
case AUDIO_S16MSB:
pcm_channel_bytes = 2;
break;
default:
DEBUGF("Unknown sample format obtained: %u\n",
(unsigned)obtained.format);
return;
}
pcm_sample_bytes = obtained.channels * pcm_channel_bytes;
pcm_dma_apply_settings_nolock();
}
void pcm_postinit(void)
{
}
void pcm_set_mixer_volume(int volume)
{
sim_volume = volume;
}
#endif /* CONFIG_CODEC == SWCODEC */