filename | src/drivers/audio_sdl.c |
changeset | 1161:d3511e94c29f |
prev | 1049:e723f379ec88 |
author | nkeynes |
date | Fri Mar 02 23:49:10 2012 +1000 (12 years ago) |
permissions | -rw-r--r-- |
last change | Android WIP: * Rename gui_jni.c to gui_android.c - now quite android specific. * Implement generic EGL driver with very minimal Java wrapper * Run emulation in separate thread, and implement simple queue for inter-thread communication. * Add menu/action-bar items for start + reset |
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nkeynes@989 | 1 | /** |
nkeynes@1021 | 2 | * $Id$ |
nkeynes@1049 | 3 | * |
nkeynes@989 | 4 | * The SDL sound driver |
nkeynes@989 | 5 | * |
nkeynes@989 | 6 | * Copyright (c) 2009 wahrhaft |
nkeynes@989 | 7 | * |
nkeynes@989 | 8 | * This program is free software; you can redistribute it and/or modify |
nkeynes@989 | 9 | * it under the terms of the GNU General Public License as published by |
nkeynes@989 | 10 | * the Free Software Foundation; either version 2 of the License, or |
nkeynes@989 | 11 | * (at your option) any later version. |
nkeynes@989 | 12 | * |
nkeynes@989 | 13 | * This program is distributed in the hope that it will be useful, |
nkeynes@989 | 14 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
nkeynes@989 | 15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
nkeynes@989 | 16 | * GNU General Public License for more details. |
nkeynes@989 | 17 | */ |
nkeynes@989 | 18 | #include <stdio.h> |
nkeynes@989 | 19 | #include <unistd.h> |
nkeynes@1161 | 20 | #include <SDL.h> |
nkeynes@1161 | 21 | #include <SDL_audio.h> |
nkeynes@989 | 22 | #include "aica/audio.h" |
nkeynes@989 | 23 | #include "lxdream.h" |
nkeynes@989 | 24 | |
nkeynes@989 | 25 | #define SDL_SAMPLES 512 //tweaking this value may help with audio dropouts |
nkeynes@989 | 26 | #define BYTES_PER_SAMPLE 4 //should be changed if samples are not S16 stereo |
nkeynes@989 | 27 | |
nkeynes@989 | 28 | #define BUFFER_MIN_SIZE SDL_SAMPLES * BYTES_PER_SAMPLE * 4 |
nkeynes@989 | 29 | #define BUFFER_MAX_SIZE SDL_SAMPLES * BYTES_PER_SAMPLE * 16 |
nkeynes@989 | 30 | |
nkeynes@1024 | 31 | static char *audio_buffer; |
nkeynes@1024 | 32 | static int buffer_pos; |
nkeynes@989 | 33 | |
nkeynes@1024 | 34 | static void mix_audio(void *userdata, Uint8 *stream, int len); |
nkeynes@989 | 35 | |
nkeynes@1024 | 36 | static gboolean audio_sdl_init( ) |
nkeynes@989 | 37 | { |
nkeynes@989 | 38 | int rate = DEFAULT_SAMPLE_RATE; |
nkeynes@989 | 39 | int format = DEFAULT_SAMPLE_FORMAT; |
nkeynes@1049 | 40 | |
nkeynes@989 | 41 | SDL_AudioSpec fmt; |
nkeynes@989 | 42 | fmt.freq = rate; |
nkeynes@1049 | 43 | if (format & AUDIO_FMT_16BIT) |
nkeynes@989 | 44 | fmt.format = AUDIO_S16; |
nkeynes@989 | 45 | else |
nkeynes@989 | 46 | fmt.format = AUDIO_U8; |
nkeynes@989 | 47 | if (format & AUDIO_FMT_STEREO) |
nkeynes@989 | 48 | fmt.channels = 2; |
nkeynes@989 | 49 | else |
nkeynes@989 | 50 | fmt.channels = 1; |
nkeynes@1049 | 51 | |
nkeynes@989 | 52 | fmt.samples = SDL_SAMPLES; |
nkeynes@989 | 53 | fmt.callback = mix_audio; |
nkeynes@989 | 54 | fmt.userdata = NULL; |
nkeynes@1049 | 55 | |
nkeynes@989 | 56 | if (SDL_OpenAudio(&fmt, NULL) < 0) |
nkeynes@989 | 57 | { |
nkeynes@989 | 58 | ERROR("Unable to open audio output (SDL)"); |
nkeynes@989 | 59 | return FALSE; |
nkeynes@989 | 60 | } |
nkeynes@989 | 61 | buffer_pos = 0; |
nkeynes@989 | 62 | audio_buffer = (char*)malloc(BUFFER_MAX_SIZE * sizeof(char)); |
nkeynes@989 | 63 | if (audio_buffer == NULL) |
nkeynes@989 | 64 | { |
nkeynes@989 | 65 | ERROR("Could not allocate audio buffer (SDL)"); |
nkeynes@989 | 66 | return FALSE; |
nkeynes@989 | 67 | } |
nkeynes@1049 | 68 | |
nkeynes@989 | 69 | return TRUE; |
nkeynes@989 | 70 | } |
nkeynes@989 | 71 | |
nkeynes@989 | 72 | gboolean audio_sdl_process_buffer( audio_buffer_t buffer ) |
nkeynes@989 | 73 | { |
nkeynes@989 | 74 | SDL_LockAudio(); |
nkeynes@989 | 75 | if (buffer_pos + buffer->length >= BUFFER_MAX_SIZE) |
nkeynes@989 | 76 | { |
nkeynes@1049 | 77 | DEBUG("Audio buffer full, dropping a chunk\n"); |
nkeynes@989 | 78 | } |
nkeynes@989 | 79 | else |
nkeynes@989 | 80 | { |
nkeynes@989 | 81 | memcpy(audio_buffer, buffer->data, buffer->length); |
nkeynes@989 | 82 | buffer_pos += buffer->length; |
nkeynes@989 | 83 | } |
nkeynes@989 | 84 | SDL_UnlockAudio(); |
nkeynes@989 | 85 | |
nkeynes@1049 | 86 | return TRUE; |
nkeynes@989 | 87 | } |
nkeynes@989 | 88 | |
nkeynes@1024 | 89 | static void mix_audio(void *userdata, Uint8 *stream, int len) |
nkeynes@989 | 90 | { |
nkeynes@989 | 91 | if (len < buffer_pos) |
nkeynes@989 | 92 | { |
nkeynes@989 | 93 | memcpy(stream, audio_buffer, len); |
nkeynes@989 | 94 | } |
nkeynes@989 | 95 | if (buffer_pos > BUFFER_MIN_SIZE) |
nkeynes@989 | 96 | { |
nkeynes@989 | 97 | memcpy(audio_buffer, &audio_buffer[len], buffer_pos - len); |
nkeynes@989 | 98 | buffer_pos -= len; |
nkeynes@989 | 99 | } |
nkeynes@989 | 100 | else |
nkeynes@989 | 101 | { |
nkeynes@1049 | 102 | DEBUG("Audio buffer low, repeating a chunk\n"); |
nkeynes@989 | 103 | } |
nkeynes@989 | 104 | } |
nkeynes@989 | 105 | |
nkeynes@1024 | 106 | static gboolean audio_sdl_shutdown() |
nkeynes@989 | 107 | { |
nkeynes@989 | 108 | SDL_CloseAudio(); |
nkeynes@989 | 109 | free(audio_buffer); |
nkeynes@989 | 110 | return TRUE; |
nkeynes@989 | 111 | } |
nkeynes@989 | 112 | |
nkeynes@1024 | 113 | static void audio_sdl_start() |
nkeynes@989 | 114 | { |
nkeynes@989 | 115 | SDL_PauseAudio(0); |
nkeynes@989 | 116 | } |
nkeynes@989 | 117 | |
nkeynes@1024 | 118 | static void audio_sdl_stop() |
nkeynes@989 | 119 | { |
nkeynes@989 | 120 | SDL_PauseAudio(1); |
nkeynes@989 | 121 | } |
nkeynes@989 | 122 | |
nkeynes@1049 | 123 | static struct audio_driver audio_sdl_driver = { |
nkeynes@989 | 124 | "sdl", |
nkeynes@989 | 125 | N_("SDL sound driver"), |
nkeynes@1024 | 126 | 20, |
nkeynes@989 | 127 | DEFAULT_SAMPLE_RATE, |
nkeynes@989 | 128 | DEFAULT_SAMPLE_FORMAT, |
nkeynes@989 | 129 | audio_sdl_init, |
nkeynes@989 | 130 | audio_sdl_start, |
nkeynes@989 | 131 | audio_sdl_process_buffer, |
nkeynes@989 | 132 | audio_sdl_stop, |
nkeynes@989 | 133 | audio_sdl_shutdown |
nkeynes@989 | 134 | }; |
nkeynes@989 | 135 | |
nkeynes@1024 | 136 | AUDIO_DRIVER( "sdl", audio_sdl_driver ); |
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