ref: 929adaabf0837f081023d0725a06c8675ed64bc1
dir: /external/SDL2/src/audio/netbsd/SDL_netbsdaudio.c/
/* Simple DirectMedia Layer Copyright (C) 1997-2018 Sam Lantinga <slouken@libsdl.org> This software is provided 'as-is', without any express or implied warranty. In no event will the authors be held liable for any damages arising from the use of this software. Permission is granted to anyone to use this software for any purpose, including commercial applications, and to alter it and redistribute it freely, subject to the following restrictions: 1. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required. 2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software. 3. This notice may not be removed or altered from any source distribution. */ #include "../../SDL_internal.h" #if SDL_AUDIO_DRIVER_NETBSD /* * Driver for native NetBSD audio(4). * vedge@vedge.com.ar. */ #include <errno.h> #include <unistd.h> #include <fcntl.h> #include <sys/time.h> #include <sys/ioctl.h> #include <sys/stat.h> #include <sys/types.h> #include <sys/audioio.h> #include "SDL_timer.h" #include "SDL_audio.h" #include "../../core/unix/SDL_poll.h" #include "../SDL_audio_c.h" #include "../SDL_audiodev_c.h" #include "SDL_netbsdaudio.h" /* Use timer for synchronization */ /* #define USE_TIMER_SYNC */ /* #define DEBUG_AUDIO */ /* #define DEBUG_AUDIO_STREAM */ static void NETBSDAUDIO_DetectDevices(void) { SDL_EnumUnixAudioDevices(0, NULL); } static void NETBSDAUDIO_Status(_THIS) { #ifdef DEBUG_AUDIO /* *INDENT-OFF* */ audio_info_t info; const audio_prinfo *prinfo; if (ioctl(this->hidden->audio_fd, AUDIO_GETINFO, &info) < 0) { fprintf(stderr, "AUDIO_GETINFO failed.\n"); return; } prinfo = this->iscapture ? &info.play : &info.record; fprintf(stderr, "\n" "[%s info]\n" "buffer size : %d bytes\n" "sample rate : %i Hz\n" "channels : %i\n" "precision : %i-bit\n" "encoding : 0x%x\n" "seek : %i\n" "sample count : %i\n" "EOF count : %i\n" "paused : %s\n" "error occured : %s\n" "waiting : %s\n" "active : %s\n" "", this->iscapture ? "record" : "play", prinfo->buffer_size, prinfo->sample_rate, prinfo->channels, prinfo->precision, prinfo->encoding, prinfo->seek, prinfo->samples, prinfo->eof, prinfo->pause ? "yes" : "no", prinfo->error ? "yes" : "no", prinfo->waiting ? "yes" : "no", prinfo->active ? "yes" : "no"); fprintf(stderr, "\n" "[audio info]\n" "monitor_gain : %i\n" "hw block size : %d bytes\n" "hi watermark : %i\n" "lo watermark : %i\n" "audio mode : %s\n" "", info.monitor_gain, info.blocksize, info.hiwat, info.lowat, (info.mode == AUMODE_PLAY) ? "PLAY" : (info.mode = AUMODE_RECORD) ? "RECORD" : (info.mode == AUMODE_PLAY_ALL ? "PLAY_ALL" : "?")); /* *INDENT-ON* */ #endif /* DEBUG_AUDIO */ } /* This function waits until it is possible to write a full sound buffer */ static void NETBSDAUDIO_WaitDevice(_THIS) { #ifndef USE_BLOCKING_WRITES /* Not necessary when using blocking writes */ /* See if we need to use timed audio synchronization */ if (this->hidden->frame_ticks) { /* Use timer for general audio synchronization */ Sint32 ticks; ticks = ((Sint32) (this->hidden->next_frame - SDL_GetTicks())) - FUDGE_TICKS; if (ticks > 0) { SDL_Delay(ticks); } } else { /* Use SDL_IOReady() for audio synchronization */ #ifdef DEBUG_AUDIO fprintf(stderr, "Waiting for audio to get ready\n"); #endif if (SDL_IOReady(this->hidden->audio_fd, SDL_TRUE, 10 * 1000) <= 0) { const char *message = "Audio timeout - buggy audio driver? (disabled)"; /* In general we should never print to the screen, but in this case we have no other way of letting the user know what happened. */ fprintf(stderr, "SDL: %s\n", message); SDL_OpenedAudioDeviceDisconnected(this); /* Don't try to close - may hang */ this->hidden->audio_fd = -1; #ifdef DEBUG_AUDIO fprintf(stderr, "Done disabling audio\n"); #endif } #ifdef DEBUG_AUDIO fprintf(stderr, "Ready!\n"); #endif } #endif /* !USE_BLOCKING_WRITES */ } static void NETBSDAUDIO_PlayDevice(_THIS) { int written, p = 0; /* Write the audio data, checking for EAGAIN on broken audio drivers */ do { written = write(this->hidden->audio_fd, &this->hidden->mixbuf[p], this->hidden->mixlen - p); if (written > 0) p += written; if (written == -1 && errno != 0 && errno != EAGAIN && errno != EINTR) { /* Non recoverable error has occurred. It should be reported!!! */ perror("audio"); break; } #ifdef DEBUG_AUDIO fprintf(stderr, "Wrote %d bytes of audio data\n", written); #endif if (p < this->hidden->mixlen || ((written < 0) && ((errno == 0) || (errno == EAGAIN)))) { SDL_Delay(1); /* Let a little CPU time go by */ } } while (p < this->hidden->mixlen); /* If timer synchronization is enabled, set the next write frame */ if (this->hidden->frame_ticks) { this->hidden->next_frame += this->hidden->frame_ticks; } /* If we couldn't write, assume fatal error for now */ if (written < 0) { SDL_OpenedAudioDeviceDisconnected(this); } } static Uint8 * NETBSDAUDIO_GetDeviceBuf(_THIS) { return (this->hidden->mixbuf); } static int NETBSDAUDIO_CaptureFromDevice(_THIS, void *_buffer, int buflen) { Uint8 *buffer = (Uint8 *) _buffer; int br, p = 0; /* Capture the audio data, checking for EAGAIN on broken audio drivers */ do { br = read(this->hidden->audio_fd, buffer + p, buflen - p); if (br > 0) p += br; if (br == -1 && errno != 0 && errno != EAGAIN && errno != EINTR) { /* Non recoverable error has occurred. It should be reported!!! */ perror("audio"); return p ? p : -1; } #ifdef DEBUG_AUDIO fprintf(stderr, "Captured %d bytes of audio data\n", br); #endif if (p < buflen || ((br < 0) && ((errno == 0) || (errno == EAGAIN)))) { SDL_Delay(1); /* Let a little CPU time go by */ } } while (p < buflen); } static void NETBSDAUDIO_FlushCapture(_THIS) { audio_info_t info; size_t remain; Uint8 buf[512]; if (ioctl(this->hidden->audio_fd, AUDIO_GETINFO, &info) < 0) { return; /* oh well. */ } remain = (size_t) (info.record.samples * (SDL_AUDIO_BITSIZE(this->spec.format) / 8)); while (remain > 0) { const size_t len = SDL_min(sizeof (buf), remain); const int br = read(this->hidden->audio_fd, buf, len); if (br <= 0) { return; /* oh well. */ } remain -= br; } } static void NETBSDAUDIO_CloseDevice(_THIS) { if (this->hidden->audio_fd >= 0) { close(this->hidden->audio_fd); } SDL_free(this->hidden->mixbuf); SDL_free(this->hidden); } static int NETBSDAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture) { const int flags = iscapture ? OPEN_FLAGS_INPUT : OPEN_FLAGS_OUTPUT; SDL_AudioFormat format = 0; audio_info_t info; audio_prinfo *prinfo = iscapture ? &info.play : &info.record; /* We don't care what the devname is...we'll try to open anything. */ /* ...but default to first name in the list... */ if (devname == NULL) { devname = SDL_GetAudioDeviceName(0, iscapture); if (devname == NULL) { return SDL_SetError("No such audio device"); } } /* Initialize all variables that we clean on shutdown */ this->hidden = (struct SDL_PrivateAudioData *) SDL_malloc((sizeof *this->hidden)); if (this->hidden == NULL) { return SDL_OutOfMemory(); } SDL_zerop(this->hidden); /* Open the audio device */ this->hidden->audio_fd = open(devname, flags, 0); if (this->hidden->audio_fd < 0) { return SDL_SetError("Couldn't open %s: %s", devname, strerror(errno)); } AUDIO_INITINFO(&info); /* Calculate the final parameters for this audio specification */ SDL_CalculateAudioSpec(&this->spec); /* Set to play mode */ info.mode = iscapture ? AUMODE_RECORD : AUMODE_PLAY; if (ioctl(this->hidden->audio_fd, AUDIO_SETINFO, &info) < 0) { return SDL_SetError("Couldn't put device into play mode"); } AUDIO_INITINFO(&info); for (format = SDL_FirstAudioFormat(this->spec.format); format; format = SDL_NextAudioFormat()) { switch (format) { case AUDIO_U8: prinfo->encoding = AUDIO_ENCODING_ULINEAR; prinfo->precision = 8; break; case AUDIO_S8: prinfo->encoding = AUDIO_ENCODING_SLINEAR; prinfo->precision = 8; break; case AUDIO_S16LSB: prinfo->encoding = AUDIO_ENCODING_SLINEAR_LE; prinfo->precision = 16; break; case AUDIO_S16MSB: prinfo->encoding = AUDIO_ENCODING_SLINEAR_BE; prinfo->precision = 16; break; case AUDIO_U16LSB: prinfo->encoding = AUDIO_ENCODING_ULINEAR_LE; prinfo->precision = 16; break; case AUDIO_U16MSB: prinfo->encoding = AUDIO_ENCODING_ULINEAR_BE; prinfo->precision = 16; break; default: continue; } if (ioctl(this->hidden->audio_fd, AUDIO_SETINFO, &info) == 0) { break; } } if (!format) { return SDL_SetError("No supported encoding for 0x%x", this->spec.format); } this->spec.format = format; AUDIO_INITINFO(&info); prinfo->channels = this->spec.channels; if (ioctl(this->hidden->audio_fd, AUDIO_SETINFO, &info) == -1) { this->spec.channels = 1; } AUDIO_INITINFO(&info); prinfo->sample_rate = this->spec.freq; info.blocksize = this->spec.size; info.hiwat = 5; info.lowat = 3; (void) ioctl(this->hidden->audio_fd, AUDIO_SETINFO, &info); (void) ioctl(this->hidden->audio_fd, AUDIO_GETINFO, &info); this->spec.freq = prinfo->sample_rate; if (!iscapture) { /* Allocate mixing buffer */ this->hidden->mixlen = this->spec.size; this->hidden->mixbuf = (Uint8 *) SDL_malloc(this->hidden->mixlen); if (this->hidden->mixbuf == NULL) { return SDL_OutOfMemory(); } SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size); } NETBSDAUDIO_Status(this); /* We're ready to rock and roll. :-) */ return 0; } static int NETBSDAUDIO_Init(SDL_AudioDriverImpl * impl) { /* Set the function pointers */ impl->DetectDevices = NETBSDAUDIO_DetectDevices; impl->OpenDevice = NETBSDAUDIO_OpenDevice; impl->PlayDevice = NETBSDAUDIO_PlayDevice; impl->WaitDevice = NETBSDAUDIO_WaitDevice; impl->GetDeviceBuf = NETBSDAUDIO_GetDeviceBuf; impl->CloseDevice = NETBSDAUDIO_CloseDevice; impl->CaptureFromDevice = NETBSDAUDIO_CaptureFromDevice; impl->FlushCapture = NETBSDAUDIO_FlushCapture; impl->HasCaptureSupport = SDL_TRUE; impl->AllowsArbitraryDeviceNames = 1; return 1; /* this audio target is available. */ } AudioBootStrap NETBSDAUDIO_bootstrap = { "netbsd", "NetBSD audio", NETBSDAUDIO_Init, 0 }; #endif /* SDL_AUDIO_DRIVER_NETBSD */ /* vi: set ts=4 sw=4 expandtab: */