400 lines
9.2 KiB
C
400 lines
9.2 KiB
C
/***************************************************************************
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* __________ __ ___.
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* Open \______ \ ____ ____ | | _\_ |__ _______ ___
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* Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ /
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* Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < <
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* Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \
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* \/ \/ \/ \/ \/
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* $Id$
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*
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* Copyright (C) 2005 by Nick Lanham
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* Copyright (C) 2010 by Thomas Martitz
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
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* KIND, either express or implied.
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*
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****************************************************************************/
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#include "autoconf.h"
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#include <stdlib.h>
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#include <stdbool.h>
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#include <SDL.h>
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#include "config.h"
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#include "debug.h"
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#include "sound.h"
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#include "audiohw.h"
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#include "system.h"
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#include "panic.h"
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#ifdef HAVE_RECORDING
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#include "audiohw.h"
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#ifdef HAVE_SPDIF_IN
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#include "spdif.h"
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#endif
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#endif
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#include "pcm.h"
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#include "pcm-internal.h"
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#include "pcm_sampr.h"
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/*#define LOGF_ENABLE*/
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#include "logf.h"
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#ifdef DEBUG
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#include <stdio.h>
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extern bool debug_audio;
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#endif
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static int cvt_status = -1;
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static const void *pcm_data;
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static size_t pcm_data_size;
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static size_t pcm_sample_bytes;
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static size_t pcm_channel_bytes;
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static struct pcm_udata
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{
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Uint8 *stream;
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Uint32 num_in;
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Uint32 num_out;
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#ifdef DEBUG
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FILE *debug;
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#endif
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} udata;
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static SDL_AudioSpec obtained;
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static SDL_AudioCVT cvt;
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static int audio_locked = 0;
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static SDL_mutex *audio_lock;
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void pcm_play_lock(void)
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{
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if (++audio_locked == 1)
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SDL_LockMutex(audio_lock);
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}
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void pcm_play_unlock(void)
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{
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if (--audio_locked == 0)
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SDL_UnlockMutex(audio_lock);
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}
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static void pcm_dma_apply_settings_nolock(void)
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{
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cvt_status = SDL_BuildAudioCVT(&cvt, AUDIO_S16SYS, 2, pcm_sampr,
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obtained.format, obtained.channels, obtained.freq);
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if (cvt_status < 0) {
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cvt.len_ratio = (double)obtained.freq / (double)pcm_sampr;
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}
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}
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void pcm_dma_apply_settings(void)
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{
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pcm_play_lock();
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pcm_dma_apply_settings_nolock();
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pcm_play_unlock();
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}
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void pcm_play_dma_start(const void *addr, size_t size)
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{
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pcm_dma_apply_settings_nolock();
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pcm_data = addr;
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pcm_data_size = size;
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SDL_PauseAudio(0);
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}
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void pcm_play_dma_stop(void)
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{
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SDL_PauseAudio(1);
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#ifdef DEBUG
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if (udata.debug != NULL) {
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fclose(udata.debug);
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udata.debug = NULL;
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DEBUGF("Audio debug file closed\n");
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}
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#endif
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}
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static void write_to_soundcard(struct pcm_udata *udata)
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{
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#ifdef DEBUG
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if (debug_audio && (udata->debug == NULL)) {
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udata->debug = fopen("audiodebug.raw", "abe");
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DEBUGF("Audio debug file open\n");
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}
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#endif
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if (cvt.needed) {
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Uint32 rd = udata->num_in;
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Uint32 wr = (double)rd * cvt.len_ratio;
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if (wr > udata->num_out) {
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wr = udata->num_out;
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rd = (double)wr / cvt.len_ratio;
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if (rd > udata->num_in)
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{
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rd = udata->num_in;
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wr = (double)rd * cvt.len_ratio;
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}
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}
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if (wr == 0 || rd == 0)
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{
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udata->num_out = udata->num_in = 0;
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return;
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}
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if (cvt_status > 0) {
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cvt.len = rd * pcm_sample_bytes;
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cvt.buf = (Uint8 *) malloc(cvt.len * cvt.len_mult);
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pcm_copy_buffer(cvt.buf, pcm_data, cvt.len);
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SDL_ConvertAudio(&cvt);
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memcpy(udata->stream, cvt.buf, cvt.len_cvt);
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udata->num_in = cvt.len / pcm_sample_bytes;
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udata->num_out = cvt.len_cvt / pcm_sample_bytes;
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#ifdef DEBUG
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if (udata->debug != NULL) {
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fwrite(cvt.buf, sizeof(Uint8), cvt.len_cvt, udata->debug);
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}
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#endif
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free(cvt.buf);
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}
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else {
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/* Convert is bad, so do silence */
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Uint32 num = wr*obtained.channels;
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udata->num_in = rd;
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udata->num_out = wr;
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switch (pcm_channel_bytes)
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{
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case 1:
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{
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Uint8 *stream = udata->stream;
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while (num-- > 0)
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*stream++ = obtained.silence;
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break;
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}
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case 2:
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{
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Uint16 *stream = (Uint16 *)udata->stream;
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while (num-- > 0)
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*stream++ = obtained.silence;
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break;
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}
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}
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#ifdef DEBUG
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if (udata->debug != NULL) {
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fwrite(udata->stream, sizeof(Uint8), wr, udata->debug);
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}
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#endif
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}
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} else {
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udata->num_in = udata->num_out = MIN(udata->num_in, udata->num_out);
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pcm_copy_buffer(udata->stream, pcm_data,
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udata->num_out * pcm_sample_bytes);
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#ifdef DEBUG
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if (udata->debug != NULL) {
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fwrite(pcm_data, sizeof(Uint8), udata->num_out * pcm_sample_bytes,
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udata->debug);
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}
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#endif
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}
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}
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static void sdl_audio_callback(struct pcm_udata *udata, Uint8 *stream, int len)
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{
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logf("sdl_audio_callback: len %d, pcm %d\n", len, pcm_data_size);
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bool new_buffer = false;
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udata->stream = stream;
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SDL_LockMutex(audio_lock);
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/* Write what we have in the PCM buffer */
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if (pcm_data_size > 0)
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goto start;
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/* Audio card wants more? Get some more then. */
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while (len > 0) {
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new_buffer = pcm_play_dma_complete_callback(PCM_DMAST_OK, &pcm_data,
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&pcm_data_size);
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if (!new_buffer) {
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DEBUGF("sdl_audio_callback: No Data.\n");
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break;
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}
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start:
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udata->num_in = pcm_data_size / pcm_sample_bytes;
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udata->num_out = len / pcm_sample_bytes;
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write_to_soundcard(udata);
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udata->num_in *= pcm_sample_bytes;
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udata->num_out *= pcm_sample_bytes;
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if (new_buffer)
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{
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new_buffer = false;
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pcm_play_dma_status_callback(PCM_DMAST_STARTED);
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if ((size_t)len > udata->num_out)
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{
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int delay = pcm_data_size*250 / pcm_sampr - 1;
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if (delay > 0)
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{
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SDL_UnlockMutex(audio_lock);
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SDL_Delay(delay);
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SDL_LockMutex(audio_lock);
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if (!pcm_is_playing())
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break;
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}
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}
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}
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pcm_data += udata->num_in;
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pcm_data_size -= udata->num_in;
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udata->stream += udata->num_out;
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len -= udata->num_out;
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}
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SDL_UnlockMutex(audio_lock);
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}
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const void * pcm_play_dma_get_peak_buffer(int *count)
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{
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uintptr_t addr = (uintptr_t)pcm_data;
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*count = pcm_data_size / 4;
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return (void *)((addr + 2) & ~3);
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}
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#ifdef HAVE_RECORDING
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void pcm_rec_lock(void)
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{
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}
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void pcm_rec_unlock(void)
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{
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}
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void pcm_rec_dma_init(void)
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{
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}
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void pcm_rec_dma_close(void)
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{
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}
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void pcm_rec_dma_start(void *start, size_t size)
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{
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(void)start;
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(void)size;
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}
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void pcm_rec_dma_stop(void)
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{
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}
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const void * pcm_rec_dma_get_peak_buffer(void)
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{
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return NULL;
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}
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void audiohw_set_recvol(int left, int right, int type)
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{
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(void)left;
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(void)right;
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(void)type;
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}
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#ifdef HAVE_SPDIF_IN
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unsigned long spdif_measure_frequency(void)
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{
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return 0;
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}
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#endif
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#endif /* HAVE_RECORDING */
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void pcm_play_dma_init(void)
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{
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if (SDL_InitSubSystem(SDL_INIT_AUDIO))
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{
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DEBUGF("Could not initialize SDL audio subsystem!\n");
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return;
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}
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audio_lock = SDL_CreateMutex();
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if (!audio_lock)
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{
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panicf("Could not create audio_lock\n");
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return;
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}
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SDL_AudioSpec wanted_spec;
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#ifdef DEBUG
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udata.debug = NULL;
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if (debug_audio) {
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udata.debug = fopen("audiodebug.raw", "wbe");
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DEBUGF("Audio debug file open\n");
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}
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#endif
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/* Set 16-bit stereo audio at 44Khz */
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wanted_spec.freq = 44100;
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wanted_spec.format = AUDIO_S16SYS;
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wanted_spec.channels = 2;
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wanted_spec.samples = 2048;
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wanted_spec.callback =
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(void (SDLCALL *)(void *userdata,
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Uint8 *stream, int len))sdl_audio_callback;
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wanted_spec.userdata = &udata;
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/* Open the audio device and start playing sound! */
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if(SDL_OpenAudio(&wanted_spec, &obtained) < 0) {
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DEBUGF("Unable to open audio: %s\n", SDL_GetError());
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return;
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}
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switch (obtained.format)
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{
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case AUDIO_U8:
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case AUDIO_S8:
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pcm_channel_bytes = 1;
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break;
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case AUDIO_U16LSB:
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case AUDIO_S16LSB:
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case AUDIO_U16MSB:
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case AUDIO_S16MSB:
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pcm_channel_bytes = 2;
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break;
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default:
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DEBUGF("Unknown sample format obtained: %u\n",
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(unsigned)obtained.format);
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return;
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}
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pcm_sample_bytes = obtained.channels * pcm_channel_bytes;
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pcm_dma_apply_settings_nolock();
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}
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void pcm_play_dma_postinit(void)
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{
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}
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