src/audio/esd/SDL_esdaudio.c
author Ryan C. Gordon
Tue, 26 Jul 2011 14:18:00 -0700
changeset 5594 e741303e08a8
parent 5535 96594ac5fd1a
child 6044 35448a5ea044
permissions -rw-r--r--
Removed needless macros in various audio targets.
slouken@0
     1
/*
slouken@5535
     2
  Simple DirectMedia Layer
slouken@5535
     3
  Copyright (C) 1997-2011 Sam Lantinga <slouken@libsdl.org>
slouken@0
     4
slouken@5535
     5
  This software is provided 'as-is', without any express or implied
slouken@5535
     6
  warranty.  In no event will the authors be held liable for any damages
slouken@5535
     7
  arising from the use of this software.
slouken@0
     8
slouken@5535
     9
  Permission is granted to anyone to use this software for any purpose,
slouken@5535
    10
  including commercial applications, and to alter it and redistribute it
slouken@5535
    11
  freely, subject to the following restrictions:
slouken@0
    12
slouken@5535
    13
  1. The origin of this software must not be misrepresented; you must not
slouken@5535
    14
     claim that you wrote the original software. If you use this software
slouken@5535
    15
     in a product, an acknowledgment in the product documentation would be
slouken@5535
    16
     appreciated but is not required.
slouken@5535
    17
  2. Altered source versions must be plainly marked as such, and must not be
slouken@5535
    18
     misrepresented as being the original software.
slouken@5535
    19
  3. This notice may not be removed or altered from any source distribution.
slouken@0
    20
*/
slouken@1402
    21
#include "SDL_config.h"
slouken@0
    22
slouken@0
    23
/* Allow access to an ESD network stream mixing buffer */
slouken@0
    24
slouken@1616
    25
#include <sys/types.h>
slouken@1616
    26
#include <unistd.h>
slouken@1616
    27
#include <signal.h>
slouken@0
    28
#include <errno.h>
slouken@0
    29
#include <esd.h>
slouken@0
    30
slouken@1358
    31
#include "SDL_timer.h"
slouken@0
    32
#include "SDL_audio.h"
slouken@1361
    33
#include "../SDL_audiomem.h"
slouken@1361
    34
#include "../SDL_audio_c.h"
slouken@0
    35
#include "SDL_esdaudio.h"
slouken@0
    36
slouken@1361
    37
#ifdef SDL_AUDIO_DRIVER_ESD_DYNAMIC
slouken@294
    38
#include "SDL_name.h"
slouken@294
    39
#include "SDL_loadso.h"
slouken@294
    40
#else
slouken@294
    41
#define SDL_NAME(X)	X
slouken@294
    42
#endif
slouken@294
    43
slouken@1361
    44
#ifdef SDL_AUDIO_DRIVER_ESD_DYNAMIC
slouken@294
    45
slouken@1361
    46
static const char *esd_library = SDL_AUDIO_DRIVER_ESD_DYNAMIC;
slouken@294
    47
static void *esd_handle = NULL;
slouken@294
    48
slouken@1895
    49
static int (*SDL_NAME(esd_open_sound)) (const char *host);
slouken@1895
    50
static int (*SDL_NAME(esd_close)) (int esd);
slouken@1895
    51
static int (*SDL_NAME(esd_play_stream)) (esd_format_t format, int rate,
slouken@1895
    52
                                         const char *host, const char *name);
icculus@2049
    53
icculus@2049
    54
#define SDL_ESD_SYM(x) { #x, (void **) (char *) &SDL_NAME(x) }
slouken@1895
    55
static struct
slouken@1895
    56
{
slouken@1895
    57
    const char *name;
slouken@1895
    58
    void **func;
slouken@3162
    59
} const esd_functions[] = {
slouken@3162
    60
    SDL_ESD_SYM(esd_open_sound),
slouken@3162
    61
    SDL_ESD_SYM(esd_close), SDL_ESD_SYM(esd_play_stream),
slouken@3162
    62
};
slouken@3162
    63
icculus@2049
    64
#undef SDL_ESD_SYM
slouken@294
    65
slouken@1895
    66
static void
slouken@1895
    67
UnloadESDLibrary()
slouken@294
    68
{
icculus@2049
    69
    if (esd_handle != NULL) {
slouken@1895
    70
        SDL_UnloadObject(esd_handle);
slouken@1895
    71
        esd_handle = NULL;
slouken@1895
    72
    }
slouken@294
    73
}
slouken@294
    74
slouken@1895
    75
static int
slouken@1895
    76
LoadESDLibrary(void)
slouken@294
    77
{
slouken@1895
    78
    int i, retval = -1;
slouken@294
    79
icculus@2049
    80
    if (esd_handle == NULL) {
icculus@2049
    81
        esd_handle = SDL_LoadObject(esd_library);
icculus@2049
    82
        if (esd_handle) {
icculus@2049
    83
            retval = 0;
icculus@2049
    84
            for (i = 0; i < SDL_arraysize(esd_functions); ++i) {
icculus@2049
    85
                *esd_functions[i].func =
icculus@2049
    86
                    SDL_LoadFunction(esd_handle, esd_functions[i].name);
icculus@2049
    87
                if (!*esd_functions[i].func) {
icculus@2049
    88
                    retval = -1;
icculus@2049
    89
                    UnloadESDLibrary();
icculus@2049
    90
                    break;
icculus@2049
    91
                }
slouken@1895
    92
            }
slouken@1895
    93
        }
slouken@1895
    94
    }
slouken@1895
    95
    return retval;
slouken@294
    96
}
slouken@294
    97
slouken@294
    98
#else
slouken@294
    99
slouken@1895
   100
static void
slouken@1895
   101
UnloadESDLibrary()
slouken@294
   102
{
slouken@1895
   103
    return;
slouken@294
   104
}
slouken@294
   105
slouken@1895
   106
static int
slouken@1895
   107
LoadESDLibrary(void)
slouken@294
   108
{
slouken@1895
   109
    return 0;
slouken@294
   110
}
slouken@294
   111
slouken@1361
   112
#endif /* SDL_AUDIO_DRIVER_ESD_DYNAMIC */
slouken@294
   113
slouken@0
   114
slouken@0
   115
/* This function waits until it is possible to write a full sound buffer */
slouken@1895
   116
static void
icculus@2049
   117
ESD_WaitDevice(_THIS)
slouken@0
   118
{
slouken@1895
   119
    Sint32 ticks;
slouken@0
   120
slouken@1895
   121
    /* Check to see if the thread-parent process is still alive */
slouken@1895
   122
    {
slouken@1895
   123
        static int cnt = 0;
slouken@1895
   124
        /* Note that this only works with thread implementations 
slouken@1895
   125
           that use a different process id for each thread.
slouken@1895
   126
         */
icculus@2049
   127
        /* Check every 10 loops */
icculus@2049
   128
        if (this->hidden->parent && (((++cnt) % 10) == 0)) {
slouken@3068
   129
            if (kill(this->hidden->parent, 0) < 0 && errno == ESRCH) {
slouken@1895
   130
                this->enabled = 0;
slouken@1895
   131
            }
slouken@1895
   132
        }
slouken@1895
   133
    }
slouken@0
   134
slouken@1895
   135
    /* Use timer for general audio synchronization */
slouken@2060
   136
    ticks =
slouken@2060
   137
        ((Sint32) (this->hidden->next_frame - SDL_GetTicks())) - FUDGE_TICKS;
slouken@1895
   138
    if (ticks > 0) {
slouken@1895
   139
        SDL_Delay(ticks);
slouken@1895
   140
    }
slouken@0
   141
}
slouken@0
   142
slouken@1895
   143
static void
icculus@2049
   144
ESD_PlayDevice(_THIS)
slouken@0
   145
{
icculus@2049
   146
    int written = 0;
slouken@0
   147
slouken@1895
   148
    /* Write the audio data, checking for EAGAIN on broken audio drivers */
slouken@1895
   149
    do {
icculus@2049
   150
        written = write(this->hidden->audio_fd,
slouken@2060
   151
                        this->hidden->mixbuf, this->hidden->mixlen);
slouken@1895
   152
        if ((written < 0) && ((errno == 0) || (errno == EAGAIN))) {
slouken@1895
   153
            SDL_Delay(1);       /* Let a little CPU time go by */
slouken@1895
   154
        }
slouken@2735
   155
    } while ((written < 0) &&
slouken@2735
   156
             ((errno == 0) || (errno == EAGAIN) || (errno == EINTR)));
slouken@0
   157
slouken@1895
   158
    /* Set the next write frame */
icculus@2049
   159
    this->hidden->next_frame += this->hidden->frame_ticks;
slouken@0
   160
slouken@1895
   161
    /* If we couldn't write, assume fatal error for now */
slouken@1895
   162
    if (written < 0) {
slouken@1895
   163
        this->enabled = 0;
slouken@1895
   164
    }
slouken@0
   165
}
slouken@0
   166
slouken@1895
   167
static Uint8 *
icculus@2049
   168
ESD_GetDeviceBuf(_THIS)
slouken@0
   169
{
icculus@2049
   170
    return (this->hidden->mixbuf);
slouken@0
   171
}
slouken@0
   172
slouken@1895
   173
static void
icculus@2049
   174
ESD_CloseDevice(_THIS)
slouken@0
   175
{
icculus@2049
   176
    if (this->hidden != NULL) {
icculus@2049
   177
        if (this->hidden->mixbuf != NULL) {
icculus@2049
   178
            SDL_FreeAudioMem(this->hidden->mixbuf);
icculus@2049
   179
            this->hidden->mixbuf = NULL;
icculus@2049
   180
        }
icculus@2049
   181
        if (this->hidden->audio_fd >= 0) {
icculus@2049
   182
            SDL_NAME(esd_close) (this->hidden->audio_fd);
icculus@2049
   183
            this->hidden->audio_fd = -1;
icculus@2049
   184
        }
icculus@2049
   185
icculus@2049
   186
        SDL_free(this->hidden);
icculus@2049
   187
        this->hidden = NULL;
slouken@1895
   188
    }
slouken@0
   189
}
slouken@0
   190
slouken@0
   191
/* Try to get the name of the program */
slouken@1895
   192
static char *
slouken@1895
   193
get_progname(void)
slouken@0
   194
{
slouken@1895
   195
    char *progname = NULL;
slouken@1402
   196
#ifdef __LINUX__
slouken@1895
   197
    FILE *fp;
slouken@1895
   198
    static char temp[BUFSIZ];
slouken@0
   199
slouken@1895
   200
    SDL_snprintf(temp, SDL_arraysize(temp), "/proc/%d/cmdline", getpid());
slouken@1895
   201
    fp = fopen(temp, "r");
slouken@1895
   202
    if (fp != NULL) {
slouken@1895
   203
        if (fgets(temp, sizeof(temp) - 1, fp)) {
slouken@1895
   204
            progname = SDL_strrchr(temp, '/');
slouken@1895
   205
            if (progname == NULL) {
slouken@1895
   206
                progname = temp;
slouken@1895
   207
            } else {
slouken@1895
   208
                progname = progname + 1;
slouken@1895
   209
            }
slouken@1895
   210
        }
slouken@1895
   211
        fclose(fp);
slouken@1895
   212
    }
slouken@0
   213
#endif
slouken@1895
   214
    return (progname);
slouken@0
   215
}
slouken@0
   216
icculus@2049
   217
slouken@1895
   218
static int
icculus@2049
   219
ESD_OpenDevice(_THIS, const char *devname, int iscapture)
slouken@0
   220
{
icculus@2049
   221
    esd_format_t format = (ESD_STREAM | ESD_PLAY);
icculus@2049
   222
    SDL_AudioFormat test_format = 0;
icculus@2049
   223
    int found = 0;
icculus@2049
   224
icculus@2049
   225
    /* Initialize all variables that we clean on shutdown */
icculus@2049
   226
    this->hidden = (struct SDL_PrivateAudioData *)
slouken@2060
   227
        SDL_malloc((sizeof *this->hidden));
icculus@2049
   228
    if (this->hidden == NULL) {
icculus@2049
   229
        SDL_OutOfMemory();
icculus@2049
   230
        return 0;
icculus@2049
   231
    }
icculus@2049
   232
    SDL_memset(this->hidden, 0, (sizeof *this->hidden));
icculus@2049
   233
    this->hidden->audio_fd = -1;
slouken@0
   234
slouken@1895
   235
    /* Convert audio spec to the ESD audio format */
icculus@2049
   236
    /* Try for a closest match on audio format */
icculus@2049
   237
    for (test_format = SDL_FirstAudioFormat(this->spec.format);
icculus@2049
   238
         !found && test_format; test_format = SDL_NextAudioFormat()) {
icculus@2049
   239
#ifdef DEBUG_AUDIO
icculus@2049
   240
        fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
icculus@2049
   241
#endif
icculus@2049
   242
        found = 1;
icculus@2049
   243
        switch (test_format) {
slouken@2060
   244
        case AUDIO_U8:
slouken@2060
   245
            format |= ESD_BITS8;
slouken@2060
   246
            break;
slouken@2060
   247
        case AUDIO_S16SYS:
slouken@2060
   248
            format |= ESD_BITS16;
slouken@2060
   249
            break;
slouken@2060
   250
        default:
slouken@2060
   251
            found = 0;
slouken@2060
   252
            break;
icculus@2049
   253
        }
slouken@1895
   254
    }
icculus@2049
   255
icculus@2049
   256
    if (!found) {
icculus@2049
   257
        ESD_CloseDevice(this);
icculus@2049
   258
        SDL_SetError("Couldn't find any hardware audio formats");
icculus@2049
   259
        return 0;
icculus@2049
   260
    }
icculus@2049
   261
icculus@2049
   262
    if (this->spec.channels == 1) {
slouken@1895
   263
        format |= ESD_MONO;
slouken@1895
   264
    } else {
slouken@1895
   265
        format |= ESD_STEREO;
slouken@1895
   266
    }
slouken@0
   267
#if 0
slouken@2060
   268
    this->spec.samples = ESD_BUF_SIZE;  /* Darn, no way to change this yet */
slouken@0
   269
#endif
slouken@0
   270
slouken@1895
   271
    /* Open a connection to the ESD audio server */
icculus@2049
   272
    this->hidden->audio_fd =
slouken@2060
   273
        SDL_NAME(esd_play_stream) (format, this->spec.freq, NULL,
slouken@2060
   274
                                   get_progname());
icculus@2049
   275
icculus@2049
   276
    if (this->hidden->audio_fd < 0) {
icculus@2049
   277
        ESD_CloseDevice(this);
slouken@1895
   278
        SDL_SetError("Couldn't open ESD connection");
icculus@2049
   279
        return 0;
slouken@1895
   280
    }
slouken@0
   281
slouken@1895
   282
    /* Calculate the final parameters for this audio specification */
icculus@2049
   283
    SDL_CalculateAudioSpec(&this->spec);
slouken@2060
   284
    this->hidden->frame_ticks =
slouken@2060
   285
        (float) (this->spec.samples * 1000) / this->spec.freq;
icculus@2049
   286
    this->hidden->next_frame = SDL_GetTicks() + this->hidden->frame_ticks;
slouken@0
   287
slouken@1895
   288
    /* Allocate mixing buffer */
icculus@2049
   289
    this->hidden->mixlen = this->spec.size;
icculus@2049
   290
    this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
icculus@2049
   291
    if (this->hidden->mixbuf == NULL) {
icculus@2049
   292
        ESD_CloseDevice(this);
icculus@2049
   293
        SDL_OutOfMemory();
icculus@2049
   294
        return 0;
slouken@1895
   295
    }
icculus@2049
   296
    SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
slouken@0
   297
slouken@1895
   298
    /* Get the parent process id (we're the parent of the audio thread) */
icculus@2049
   299
    this->hidden->parent = getpid();
slouken@0
   300
slouken@1895
   301
    /* We're ready to rock and roll. :-) */
icculus@2049
   302
    return 1;
icculus@2049
   303
}
icculus@2049
   304
icculus@2049
   305
static void
icculus@2049
   306
ESD_Deinitialize(void)
icculus@2049
   307
{
icculus@2049
   308
    UnloadESDLibrary();
slouken@0
   309
}
slouken@1895
   310
icculus@2049
   311
static int
slouken@2060
   312
ESD_Init(SDL_AudioDriverImpl * impl)
icculus@2049
   313
{
icculus@2049
   314
    if (LoadESDLibrary() < 0) {
icculus@2049
   315
        return 0;
icculus@2049
   316
    } else {
icculus@2049
   317
        int connection = 0;
icculus@2049
   318
icculus@2049
   319
        /* Don't start ESD if it's not running */
icculus@3581
   320
        SDL_setenv("ESD_NO_SPAWN", "1", 0);
icculus@2049
   321
icculus@2049
   322
        connection = SDL_NAME(esd_open_sound) (NULL);
icculus@2049
   323
        if (connection < 0) {
icculus@2049
   324
            UnloadESDLibrary();
icculus@2049
   325
            SDL_SetError("ESD: esd_open_sound failed (no audio server?)");
icculus@2049
   326
            return 0;
icculus@2049
   327
        }
icculus@2049
   328
        SDL_NAME(esd_close) (connection);
icculus@2049
   329
    }
icculus@2049
   330
icculus@2049
   331
    /* Set the function pointers */
icculus@2049
   332
    impl->OpenDevice = ESD_OpenDevice;
icculus@2049
   333
    impl->PlayDevice = ESD_PlayDevice;
icculus@2049
   334
    impl->WaitDevice = ESD_WaitDevice;
icculus@2049
   335
    impl->GetDeviceBuf = ESD_GetDeviceBuf;
icculus@2049
   336
    impl->CloseDevice = ESD_CloseDevice;
icculus@2049
   337
    impl->Deinitialize = ESD_Deinitialize;
icculus@2049
   338
    impl->OnlyHasDefaultOutputDevice = 1;
icculus@2049
   339
icculus@3699
   340
    return 1;   /* this audio target is available. */
icculus@2049
   341
}
icculus@2049
   342
icculus@2049
   343
icculus@2049
   344
AudioBootStrap ESD_bootstrap = {
icculus@5594
   345
    "esd", "Enlightened Sound Daemon", ESD_Init, 0
icculus@2049
   346
};
icculus@2049
   347
slouken@1895
   348
/* vi: set ts=4 sw=4 expandtab: */