| /*************************************************************************** |
| * __________ __ ___. |
| * Open \______ \ ____ ____ | | _\_ |__ _______ ___ |
| * Source | _// _ \_/ ___\| |/ /| __ \ / _ \ \/ / |
| * Jukebox | | ( <_> ) \___| < | \_\ ( <_> > < < |
| * Firmware |____|_ /\____/ \___ >__|_ \|___ /\____/__/\_ \ |
| * \/ \/ \/ \/ \/ |
| * $Id$ |
| * |
| * Copyright (C) 2005 by Nick Lanham |
| * |
| * 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 <memory.h> |
| #include "debug.h" |
| #include "kernel.h" |
| #include "sound.h" |
| |
| #include "pcm.h" |
| #include "pcm_sampr.h" |
| #include "SDL.h" |
| |
| static int cvt_status = -1; |
| static unsigned long pcm_frequency = SAMPR_44; |
| |
| static Uint8* pcm_data; |
| static size_t pcm_data_size; |
| static size_t pcm_sample_bytes; |
| static size_t pcm_channel_bytes; |
| |
| struct pcm_udata |
| { |
| Uint8 *stream; |
| Uint32 num_in; |
| Uint32 num_out; |
| FILE *debug; |
| } udata; |
| |
| static SDL_AudioSpec obtained; |
| static SDL_AudioCVT cvt; |
| |
| extern bool debug_audio; |
| |
| #ifndef MIN |
| #define MIN(a, b) (((a) < (b)) ? (a) : (b)) |
| #endif |
| |
| void pcm_play_lock(void) |
| { |
| SDL_LockAudio(); |
| } |
| |
| void pcm_play_unlock(void) |
| { |
| SDL_UnlockAudio(); |
| } |
| |
| static void pcm_apply_settings_nolock(void) |
| { |
| cvt_status = SDL_BuildAudioCVT(&cvt, AUDIO_S16SYS, 2, pcm_frequency, |
| obtained.format, obtained.channels, obtained.freq); |
| |
| pcm_curr_sampr = pcm_frequency; |
| |
| if (cvt_status < 0) { |
| cvt.len_ratio = (double)obtained.freq / (double)pcm_curr_sampr; |
| } |
| } |
| |
| void pcm_apply_settings(void) |
| { |
| pcm_play_lock(); |
| pcm_apply_settings_nolock(); |
| pcm_play_unlock(); |
| } |
| |
| void pcm_play_dma_start(const void *addr, size_t size) |
| { |
| pcm_apply_settings_nolock(); |
| |
| pcm_data = (Uint8 *) addr; |
| pcm_data_size = size; |
| |
| SDL_PauseAudio(0); |
| } |
| |
| void pcm_play_dma_stop(void) |
| { |
| SDL_PauseAudio(1); |
| } |
| |
| 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; |
| } |
| |
| void pcm_set_frequency(unsigned int frequency) |
| { |
| switch (frequency) |
| { |
| HW_HAVE_8_( case SAMPR_8:) |
| HW_HAVE_11_(case SAMPR_11:) |
| HW_HAVE_12_(case SAMPR_12:) |
| HW_HAVE_16_(case SAMPR_16:) |
| HW_HAVE_22_(case SAMPR_22:) |
| HW_HAVE_24_(case SAMPR_24:) |
| HW_HAVE_32_(case SAMPR_32:) |
| HW_HAVE_44_(case SAMPR_44:) |
| HW_HAVE_48_(case SAMPR_48:) |
| HW_HAVE_64_(case SAMPR_64:) |
| HW_HAVE_88_(case SAMPR_88:) |
| HW_HAVE_96_(case SAMPR_96:) |
| break; |
| default: |
| frequency = SAMPR_44; |
| } |
| |
| pcm_frequency = frequency; |
| } |
| |
| extern int sim_volume; /* in firmware/sound.c */ |
| void write_to_soundcard(struct pcm_udata *udata) { |
| 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; |
| |
| if (udata->debug != NULL) { |
| fwrite(cvt.buf, sizeof(Uint8), cvt.len_cvt, udata->debug); |
| } |
| |
| 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; |
| } |
| } |
| |
| if (udata->debug != NULL) { |
| fwrite(udata->stream, sizeof(Uint8), wr, udata->debug); |
| } |
| } |
| } 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); |
| |
| if (udata->debug != NULL) { |
| fwrite(pcm_data, sizeof(Uint8), udata->num_out * pcm_sample_bytes, |
| udata->debug); |
| } |
| } |
| } |
| |
| void sdl_audio_callback(struct pcm_udata *udata, Uint8 *stream, int len) |
| { |
| 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) { |
| if ((ssize_t)pcm_data_size <= 0) { |
| pcm_data_size = 0; |
| |
| if (pcm_callback_for_more) |
| pcm_callback_for_more(&pcm_data, &pcm_data_size); |
| } |
| |
| if (pcm_data_size > 0) { |
| start: |
| 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"); |
| pcm_play_dma_stop(); |
| pcm_play_dma_stopped_callback(); |
| 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) |
| { |
| } |
| |
| void pcm_record_more(void *start, size_t size) |
| { |
| (void)start; |
| (void)size; |
| } |
| |
| unsigned long pcm_rec_status(void) |
| { |
| return 0; |
| } |
| |
| const void * pcm_rec_dma_get_peak_buffer(int *count) |
| { |
| *count = 0; |
| return NULL; |
| } |
| |
| #endif /* HAVE_RECORDING */ |
| |
| void pcm_play_dma_init(void) |
| { |
| SDL_AudioSpec wanted_spec; |
| udata.debug = NULL; |
| |
| if (debug_audio) { |
| udata.debug = fopen("audiodebug.raw", "wb"); |
| } |
| |
| /* 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) { |
| fprintf(stderr, "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: |
| fprintf(stderr, "Unknown sample format obtained: %u\n", |
| (unsigned)obtained.format); |
| return; |
| } |
| |
| pcm_sample_bytes = obtained.channels * pcm_channel_bytes; |
| |
| pcm_apply_settings_nolock(); |
| } |
| |
| void pcm_postinit(void) |
| { |
| } |