forked from Green-Sky/tomato
307 lines
9.9 KiB
C
307 lines
9.9 KiB
C
/*
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Simple DirectMedia Layer
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Copyright (C) 1997-2023 Sam Lantinga <slouken@libsdl.org>
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This software is provided 'as-is', without any express or implied
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warranty. In no event will the authors be held liable for any damages
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arising from the use of this software.
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Permission is granted to anyone to use this software for any purpose,
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including commercial applications, and to alter it and redistribute it
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freely, subject to the following restrictions:
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1. The origin of this software must not be misrepresented; you must not
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claim that you wrote the original software. If you use this software
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in a product, an acknowledgment in the product documentation would be
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appreciated but is not required.
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2. Altered source versions must be plainly marked as such, and must not be
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misrepresented as being the original software.
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3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_internal.h"
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// !!! FIXME: clean out perror and fprintf calls in here.
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#ifdef SDL_AUDIO_DRIVER_OSS
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#include <stdio.h> /* For perror() */
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#include <string.h> /* For strerror() */
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#include <errno.h>
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#include <unistd.h>
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#include <fcntl.h>
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#include <signal.h>
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#include <sys/time.h>
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#include <sys/ioctl.h>
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#include <sys/stat.h>
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#include <sys/soundcard.h>
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#include "../SDL_audio_c.h"
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#include "../SDL_audiodev_c.h"
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#include "../../SDL_utils_c.h"
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#include "SDL_dspaudio.h"
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static void DSP_DetectDevices(SDL_AudioDevice **default_output, SDL_AudioDevice **default_capture)
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{
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SDL_EnumUnixAudioDevices(SDL_FALSE, NULL);
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}
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static void DSP_CloseDevice(SDL_AudioDevice *device)
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{
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if (device->hidden) {
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if (device->hidden->audio_fd >= 0) {
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close(device->hidden->audio_fd);
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}
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SDL_free(device->hidden->mixbuf);
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SDL_free(device->hidden);
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}
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}
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static int DSP_OpenDevice(SDL_AudioDevice *device)
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{
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// Make sure fragment size stays a power of 2, or OSS fails.
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// (I don't know which of these are actually legal values, though...)
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if (device->spec.channels > 8) {
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device->spec.channels = 8;
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} else if (device->spec.channels > 4) {
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device->spec.channels = 4;
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} else if (device->spec.channels > 2) {
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device->spec.channels = 2;
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}
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// Initialize all variables that we clean on shutdown
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device->hidden = (struct SDL_PrivateAudioData *) SDL_calloc(1, sizeof(*device->hidden));
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if (device->hidden == NULL) {
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return SDL_OutOfMemory();
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}
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// Open the audio device; we hardcode the device path in `device->name` for lack of better info, so use that.
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const int flags = ((device->iscapture) ? OPEN_FLAGS_INPUT : OPEN_FLAGS_OUTPUT);
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device->hidden->audio_fd = open(device->name, flags | O_CLOEXEC, 0);
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if (device->hidden->audio_fd < 0) {
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return SDL_SetError("Couldn't open %s: %s", device->name, strerror(errno));
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}
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// Make the file descriptor use blocking i/o with fcntl()
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{
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const long ctlflags = fcntl(device->hidden->audio_fd, F_GETFL) & ~O_NONBLOCK;
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if (fcntl(device->hidden->audio_fd, F_SETFL, ctlflags) < 0) {
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return SDL_SetError("Couldn't set audio blocking mode");
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}
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}
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// Get a list of supported hardware formats
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int value;
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if (ioctl(device->hidden->audio_fd, SNDCTL_DSP_GETFMTS, &value) < 0) {
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perror("SNDCTL_DSP_GETFMTS");
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return SDL_SetError("Couldn't get audio format list");
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}
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/* Try for a closest match on audio format */
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int format = 0;
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SDL_AudioFormat test_format;
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const SDL_AudioFormat *closefmts = SDL_ClosestAudioFormats(device->spec.format);
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while ((test_format = *(closefmts++)) != 0) {
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#ifdef DEBUG_AUDIO
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fprintf(stderr, "Trying format 0x%4.4x\n", test_format);
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#endif
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switch (test_format) {
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case SDL_AUDIO_U8:
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if (value & AFMT_U8) {
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format = AFMT_U8;
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}
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break;
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case SDL_AUDIO_S16LE:
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if (value & AFMT_S16_LE) {
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format = AFMT_S16_LE;
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}
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break;
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case SDL_AUDIO_S16BE:
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if (value & AFMT_S16_BE) {
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format = AFMT_S16_BE;
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}
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break;
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default:
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continue;
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}
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break;
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}
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if (format == 0) {
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return SDL_SetError("Couldn't find any hardware audio formats");
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}
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device->spec.format = test_format;
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// Set the audio format
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value = format;
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if ((ioctl(device->hidden->audio_fd, SNDCTL_DSP_SETFMT, &value) < 0) ||
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(value != format)) {
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perror("SNDCTL_DSP_SETFMT");
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return SDL_SetError("Couldn't set audio format");
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}
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// Set the number of channels of output
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value = device->spec.channels;
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if (ioctl(device->hidden->audio_fd, SNDCTL_DSP_CHANNELS, &value) < 0) {
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perror("SNDCTL_DSP_CHANNELS");
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return SDL_SetError("Cannot set the number of channels");
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}
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device->spec.channels = value;
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// Set the DSP frequency
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value = device->spec.freq;
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if (ioctl(device->hidden->audio_fd, SNDCTL_DSP_SPEED, &value) < 0) {
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perror("SNDCTL_DSP_SPEED");
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return SDL_SetError("Couldn't set audio frequency");
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}
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device->spec.freq = value;
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/* Calculate the final parameters for this audio specification */
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SDL_UpdatedAudioDeviceFormat(device);
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/* Determine the power of two of the fragment size
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Since apps don't control this in SDL3, and this driver only accepts 8, 16
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bit formats and 1, 2, 4, 8 channels, this should always be a power of 2 already. */
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SDL_assert(SDL_powerof2(device->buffer_size) == device->buffer_size);
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int frag_spec = 0;
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while ((0x01U << frag_spec) < device->buffer_size) {
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frag_spec++;
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}
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frag_spec |= 0x00020000; /* two fragments, for low latency */
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/* Set the audio buffering parameters */
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#ifdef DEBUG_AUDIO
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fprintf(stderr, "Requesting %d fragments of size %d\n",
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(frag_spec >> 16), 1 << (frag_spec & 0xFFFF));
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#endif
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if (ioctl(device->hidden->audio_fd, SNDCTL_DSP_SETFRAGMENT, &frag_spec) < 0) {
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perror("SNDCTL_DSP_SETFRAGMENT");
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}
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#ifdef DEBUG_AUDIO
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{
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audio_buf_info info;
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ioctl(device->hidden->audio_fd, SNDCTL_DSP_GETOSPACE, &info);
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fprintf(stderr, "fragments = %d\n", info.fragments);
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fprintf(stderr, "fragstotal = %d\n", info.fragstotal);
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fprintf(stderr, "fragsize = %d\n", info.fragsize);
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fprintf(stderr, "bytes = %d\n", info.bytes);
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}
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#endif
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/* Allocate mixing buffer */
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if (!device->iscapture) {
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device->hidden->mixbuf = (Uint8 *)SDL_malloc(device->buffer_size);
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if (device->hidden->mixbuf == NULL) {
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return SDL_OutOfMemory();
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}
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SDL_memset(device->hidden->mixbuf, device->silence_value, device->buffer_size);
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}
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return 0; // We're ready to rock and roll. :-)
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}
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static void DSP_WaitDevice(SDL_AudioDevice *device)
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{
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const unsigned long ioctlreq = device->iscapture ? SNDCTL_DSP_GETISPACE : SNDCTL_DSP_GETOSPACE;
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struct SDL_PrivateAudioData *h = device->hidden;
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while (!SDL_AtomicGet(&device->shutdown)) {
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audio_buf_info info;
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const int rc = ioctl(h->audio_fd, ioctlreq, &info);
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if (rc < 0) {
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if (errno == EAGAIN) {
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continue;
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}
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// Hmm, not much we can do - abort
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fprintf(stderr, "dsp WaitDevice ioctl failed (unrecoverable): %s\n", strerror(errno));
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SDL_AudioDeviceDisconnected(device);
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return;
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} else if (info.bytes < device->buffer_size) {
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SDL_Delay(10);
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} else {
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break; // ready to go!
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}
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}
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}
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static int DSP_PlayDevice(SDL_AudioDevice *device, const Uint8 *buffer, int buflen)
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{
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struct SDL_PrivateAudioData *h = device->hidden;
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if (write(h->audio_fd, buffer, buflen) == -1) {
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perror("Audio write");
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return -1;
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}
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#ifdef DEBUG_AUDIO
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fprintf(stderr, "Wrote %d bytes of audio data\n", h->mixlen);
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#endif
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return 0;
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}
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static Uint8 *DSP_GetDeviceBuf(SDL_AudioDevice *device, int *buffer_size)
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{
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return device->hidden->mixbuf;
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}
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static int DSP_CaptureFromDevice(SDL_AudioDevice *device, void *buffer, int buflen)
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{
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return (int)read(device->hidden->audio_fd, buffer, buflen);
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}
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static void DSP_FlushCapture(SDL_AudioDevice *device)
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{
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struct SDL_PrivateAudioData *h = device->hidden;
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audio_buf_info info;
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if (ioctl(h->audio_fd, SNDCTL_DSP_GETISPACE, &info) == 0) {
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while (info.bytes > 0) {
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char buf[512];
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const size_t len = SDL_min(sizeof(buf), info.bytes);
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const ssize_t br = read(h->audio_fd, buf, len);
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if (br <= 0) {
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break;
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}
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info.bytes -= br;
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}
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}
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}
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static SDL_bool InitTimeDevicesExist = SDL_FALSE;
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static SDL_bool look_for_devices_test(int fd)
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{
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InitTimeDevicesExist = SDL_TRUE; /* note that _something_ exists. */
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/* Don't add to the device list, we're just seeing if any devices exist. */
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return SDL_FALSE;
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}
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static SDL_bool DSP_Init(SDL_AudioDriverImpl *impl)
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{
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InitTimeDevicesExist = SDL_FALSE;
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SDL_EnumUnixAudioDevices(SDL_FALSE, look_for_devices_test);
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if (!InitTimeDevicesExist) {
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SDL_SetError("dsp: No such audio device");
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return SDL_FALSE; /* maybe try a different backend. */
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}
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/* Set the function pointers */
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impl->DetectDevices = DSP_DetectDevices;
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impl->OpenDevice = DSP_OpenDevice;
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impl->WaitDevice = DSP_WaitDevice;
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impl->PlayDevice = DSP_PlayDevice;
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impl->GetDeviceBuf = DSP_GetDeviceBuf;
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impl->CloseDevice = DSP_CloseDevice;
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impl->WaitCaptureDevice = DSP_WaitDevice;
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impl->CaptureFromDevice = DSP_CaptureFromDevice;
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impl->FlushCapture = DSP_FlushCapture;
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impl->AllowsArbitraryDeviceNames = SDL_TRUE;
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impl->HasCaptureSupport = SDL_TRUE;
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return SDL_TRUE; /* this audio target is available. */
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}
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AudioBootStrap DSP_bootstrap = {
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"dsp", "Open Sound System (/dev/dsp)", DSP_Init, SDL_FALSE
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};
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#endif /* SDL_AUDIO_DRIVER_OSS */
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