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https://github.com/libsdl-org/SDL.git
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9d7c57234a
Fully committing to it...! This left SDL_wave.* alone for now, since there's a ton of comments in there and this code hasn't changed much from SDL2 so far. But as SDL2 ages out a little more, I'll likely switch this over, too.
330 lines
10 KiB
C
330 lines
10 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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#ifdef SDL_AUDIO_DRIVER_NETBSD
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// Driver for native NetBSD audio(4).
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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 <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/types.h>
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#include <sys/audioio.h>
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#include "../../core/unix/SDL_poll.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_netbsdaudio.h"
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//#define DEBUG_AUDIO
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static void NETBSDAUDIO_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 NETBSDAUDIO_Status(SDL_AudioDevice *device)
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{
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#ifdef DEBUG_AUDIO
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/* *INDENT-OFF* */ /* clang-format off */
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audio_info_t info;
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const struct audio_prinfo *prinfo;
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if (ioctl(device->hidden->audio_fd, AUDIO_GETINFO, &info) < 0) {
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fprintf(stderr, "AUDIO_GETINFO failed.\n");
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return;
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}
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prinfo = device->iscapture ? &info.record : &info.play;
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fprintf(stderr, "\n"
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"[%s info]\n"
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"buffer size : %d bytes\n"
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"sample rate : %i Hz\n"
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"channels : %i\n"
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"precision : %i-bit\n"
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"encoding : 0x%x\n"
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"seek : %i\n"
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"sample count : %i\n"
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"EOF count : %i\n"
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"paused : %s\n"
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"error occurred : %s\n"
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"waiting : %s\n"
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"active : %s\n"
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"",
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device->iscapture ? "record" : "play",
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prinfo->buffer_size,
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prinfo->sample_rate,
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prinfo->channels,
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prinfo->precision,
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prinfo->encoding,
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prinfo->seek,
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prinfo->samples,
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prinfo->eof,
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prinfo->pause ? "yes" : "no",
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prinfo->error ? "yes" : "no",
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prinfo->waiting ? "yes" : "no",
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prinfo->active ? "yes" : "no");
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fprintf(stderr, "\n"
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"[audio info]\n"
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"monitor_gain : %i\n"
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"hw block size : %d bytes\n"
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"hi watermark : %i\n"
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"lo watermark : %i\n"
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"audio mode : %s\n"
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"",
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info.monitor_gain,
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info.blocksize,
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info.hiwat, info.lowat,
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(info.mode == AUMODE_PLAY) ? "PLAY"
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: (info.mode == AUMODE_RECORD) ? "RECORD"
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: (info.mode == AUMODE_PLAY_ALL ? "PLAY_ALL" : "?"));
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fprintf(stderr, "\n"
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"[audio spec]\n"
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"format : 0x%x\n"
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"size : %u\n"
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"",
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device->spec.format,
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device->buffer_size);
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/* *INDENT-ON* */ /* clang-format on */
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#endif // DEBUG_AUDIO
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}
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static int NETBSDAUDIO_WaitDevice(SDL_AudioDevice *device)
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{
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const SDL_bool iscapture = device->iscapture;
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while (!SDL_AtomicGet(&device->shutdown)) {
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audio_info_t info;
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const int rc = ioctl(device->hidden->audio_fd, AUDIO_GETINFO, &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, "netbsdaudio WaitDevice ioctl failed (unrecoverable): %s\n", strerror(errno));
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return -1;
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}
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const size_t remain = (size_t)((iscapture ? info.record.seek : info.play.seek) * SDL_AUDIO_BYTESIZE(device->spec.format));
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if (!iscapture && (remain >= device->buffer_size)) {
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SDL_Delay(10);
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} else if (iscapture && (remain < 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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return 0;
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}
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static int NETBSDAUDIO_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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const int written = write(h->audio_fd, buffer, buflen);
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if (written != buflen) { // Treat even partial writes as fatal errors.
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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", written);
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#endif
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return 0;
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}
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static Uint8 *NETBSDAUDIO_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 NETBSDAUDIO_CaptureFromDevice(SDL_AudioDevice *device, void *vbuffer, int buflen)
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{
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Uint8 *buffer = (Uint8 *)vbuffer;
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const int br = read(device->hidden->audio_fd, buffer, buflen);
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if (br == -1) {
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// Non recoverable error has occurred. It should be reported!!!
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perror("audio");
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return -1;
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}
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#ifdef DEBUG_AUDIO
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fprintf(stderr, "Captured %d bytes of audio data\n", br);
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#endif
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return br;
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}
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static void NETBSDAUDIO_FlushCapture(SDL_AudioDevice *device)
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{
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struct SDL_PrivateAudioData *h = device->hidden;
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audio_info_t info;
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if (ioctl(device->hidden->audio_fd, AUDIO_GETINFO, &info) == 0) {
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size_t remain = (size_t)(info.record.seek * SDL_AUDIO_BYTESIZE(device->spec.format));
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while (remain > 0) {
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char buf[512];
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const size_t len = SDL_min(sizeof(buf), remain);
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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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remain -= br;
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}
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}
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}
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static void NETBSDAUDIO_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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device->hidden = NULL;
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}
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}
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static int NETBSDAUDIO_OpenDevice(SDL_AudioDevice *device)
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{
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const SDL_bool iscapture = device->iscapture;
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int encoding = AUDIO_ENCODING_NONE;
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audio_info_t info, hwinfo;
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struct audio_prinfo *prinfo = iscapture ? &info.record : &info.play;
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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) ? O_RDONLY : O_WRONLY);
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device->hidden->audio_fd = open(device->name, flags | O_CLOEXEC);
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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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AUDIO_INITINFO(&info);
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#ifdef AUDIO_GETFORMAT // Introduced in NetBSD 9.0
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if (ioctl(device->hidden->audio_fd, AUDIO_GETFORMAT, &hwinfo) != -1) {
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// Use the device's native sample rate so the kernel doesn't have to resample.
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device->spec.freq = iscapture ? hwinfo.record.sample_rate : hwinfo.play.sample_rate;
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}
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#endif
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prinfo->sample_rate = device->spec.freq;
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prinfo->channels = device->spec.channels;
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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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switch (test_format) {
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case SDL_AUDIO_U8:
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encoding = AUDIO_ENCODING_ULINEAR;
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break;
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case SDL_AUDIO_S8:
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encoding = AUDIO_ENCODING_SLINEAR;
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break;
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case SDL_AUDIO_S16LE:
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encoding = AUDIO_ENCODING_SLINEAR_LE;
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break;
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case SDL_AUDIO_S16BE:
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encoding = AUDIO_ENCODING_SLINEAR_BE;
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break;
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case SDL_AUDIO_S32LE:
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encoding = AUDIO_ENCODING_SLINEAR_LE;
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break;
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case SDL_AUDIO_S32BE:
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encoding = AUDIO_ENCODING_SLINEAR_BE;
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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 (!test_format) {
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return SDL_SetError("%s: Unsupported audio format", "netbsd");
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}
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prinfo->encoding = encoding;
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prinfo->precision = SDL_AUDIO_BITSIZE(test_format);
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info.hiwat = 5;
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info.lowat = 3;
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if (ioctl(device->hidden->audio_fd, AUDIO_SETINFO, &info) < 0) {
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return SDL_SetError("AUDIO_SETINFO failed for %s: %s", device->name, strerror(errno));
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}
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if (ioctl(device->hidden->audio_fd, AUDIO_GETINFO, &info) < 0) {
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return SDL_SetError("AUDIO_GETINFO failed for %s: %s", device->name, strerror(errno));
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}
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// Final spec used for the device.
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device->spec.format = test_format;
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device->spec.freq = prinfo->sample_rate;
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device->spec.channels = prinfo->channels;
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SDL_UpdatedAudioDeviceFormat(device);
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if (!iscapture) {
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// Allocate mixing buffer
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device->hidden->mixlen = device->buffer_size;
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device->hidden->mixbuf = (Uint8 *)SDL_malloc(device->hidden->mixlen);
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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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NETBSDAUDIO_Status(device);
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return 0; // We're ready to rock and roll. :-)
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}
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static SDL_bool NETBSDAUDIO_Init(SDL_AudioDriverImpl *impl)
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{
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impl->DetectDevices = NETBSDAUDIO_DetectDevices;
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impl->OpenDevice = NETBSDAUDIO_OpenDevice;
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impl->WaitDevice = NETBSDAUDIO_WaitDevice;
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impl->PlayDevice = NETBSDAUDIO_PlayDevice;
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impl->GetDeviceBuf = NETBSDAUDIO_GetDeviceBuf;
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impl->CloseDevice = NETBSDAUDIO_CloseDevice;
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impl->WaitCaptureDevice = NETBSDAUDIO_WaitDevice;
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impl->CaptureFromDevice = NETBSDAUDIO_CaptureFromDevice;
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impl->FlushCapture = NETBSDAUDIO_FlushCapture;
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impl->HasCaptureSupport = SDL_TRUE;
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return SDL_TRUE;
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}
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AudioBootStrap NETBSDAUDIO_bootstrap = {
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"netbsd", "NetBSD audio", NETBSDAUDIO_Init, SDL_FALSE
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};
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#endif // SDL_AUDIO_DRIVER_NETBSD
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