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https://github.com/Relintai/sdl2_frt.git
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bsdaudio: first shot at audio capture support!
(untested, uncompiled...for now.)
This commit is contained in:
Ryan C. Gordon
parent
d30a2f5ad8
commit
9dd8477a21
@ -63,13 +63,17 @@ BSDAUDIO_Status(_THIS)
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#ifdef DEBUG_AUDIO
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/* *INDENT-OFF* */
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audio_info_t info;
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const audio_prinfo *prinfo;
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if (ioctl(this->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 = this->iscapture ? &info.play : &info.record;
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fprintf(stderr, "\n"
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"[play/record info]\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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@ -83,18 +87,19 @@ BSDAUDIO_Status(_THIS)
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"waiting : %s\n"
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"active : %s\n"
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"",
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info.play.buffer_size,
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info.play.sample_rate,
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info.play.channels,
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info.play.precision,
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info.play.encoding,
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info.play.seek,
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info.play.samples,
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info.play.eof,
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info.play.pause ? "yes" : "no",
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info.play.error ? "yes" : "no",
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info.play.waiting ? "yes" : "no",
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info.play.active ? "yes" : "no");
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this->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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@ -209,6 +214,57 @@ BSDAUDIO_GetDeviceBuf(_THIS)
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return (this->hidden->mixbuf);
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}
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static int
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BSDAUDIO_CaptureFromDevice(_THIS, void *_buffer, int buflen)
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{
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Uint8 *buffer = (Uint8 *) _buffer;
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int br, p = 0;
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/* Write the audio data, checking for EAGAIN on broken audio drivers */
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do {
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br = read(this->hidden->audio_fd, buffer + p, buflen - p);
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if (br > 0)
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p += br;
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if (br == -1 && errno != 0 && errno != EAGAIN && errno != EINTR) {
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/* Non recoverable error has occurred. It should be reported!!! */
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perror("audio");
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return p ? p : -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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if (p < buflen
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|| ((br < 0) && ((errno == 0) || (errno == EAGAIN)))) {
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SDL_Delay(1); /* Let a little CPU time go by */
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}
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} while (p < buflen);
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}
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static void
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BSDAUDIO_FlushCapture(_THIS)
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{
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audio_info_t info;
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size_t remain;
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Uint8 buf[512];
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if (ioctl(this->hidden->audio_fd, AUDIO_GETINFO, &info) < 0) {
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return; /* oh well. */
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}
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remain = (size_t) (info.record.samples * (SDL_AUDIO_BITSIZE(this->spec.format) / 8));
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while (remain > 0) {
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const size_t len = SDL_min(sizeof (buf), remain);
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const int br = read(this->hidden->audio_fd, buf, len);
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if (br <= 0) {
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return; /* oh well. */
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}
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remain -= br;
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}
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}
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static void
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BSDAUDIO_CloseDevice(_THIS)
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{
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@ -227,9 +283,10 @@ BSDAUDIO_CloseDevice(_THIS)
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static int
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BSDAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
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{
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const int flags = ((iscapture) ? OPEN_FLAGS_INPUT : OPEN_FLAGS_OUTPUT);
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const int flags = iscapture ? OPEN_FLAGS_INPUT : OPEN_FLAGS_OUTPUT;
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SDL_AudioFormat format = 0;
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audio_info_t info;
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audio_prinfo *prinfo = iscapture ? &info.play : &info.record;
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/* We don't care what the devname is...we'll try to open anything. */
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/* ...but default to first name in the list... */
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@ -260,7 +317,7 @@ BSDAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
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SDL_CalculateAudioSpec(&this->spec);
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/* Set to play mode */
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info.mode = AUMODE_PLAY;
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info.mode = iscapture ? AUMODE_RECORD : AUMODE_PLAY;
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if (ioctl(this->hidden->audio_fd, AUDIO_SETINFO, &info) < 0) {
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BSDAUDIO_CloseDevice(this);
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return SDL_SetError("Couldn't put device into play mode");
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@ -271,28 +328,28 @@ BSDAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
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format; format = SDL_NextAudioFormat()) {
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switch (format) {
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case AUDIO_U8:
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info.play.encoding = AUDIO_ENCODING_ULINEAR;
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info.play.precision = 8;
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prinfo->encoding = AUDIO_ENCODING_ULINEAR;
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prinfo->precision = 8;
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break;
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case AUDIO_S8:
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info.play.encoding = AUDIO_ENCODING_SLINEAR;
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info.play.precision = 8;
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prinfo->encoding = AUDIO_ENCODING_SLINEAR;
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prinfo->precision = 8;
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break;
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case AUDIO_S16LSB:
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info.play.encoding = AUDIO_ENCODING_SLINEAR_LE;
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info.play.precision = 16;
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prinfo->encoding = AUDIO_ENCODING_SLINEAR_LE;
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prinfo->precision = 16;
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break;
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case AUDIO_S16MSB:
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info.play.encoding = AUDIO_ENCODING_SLINEAR_BE;
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info.play.precision = 16;
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prinfo->encoding = AUDIO_ENCODING_SLINEAR_BE;
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prinfo->precision = 16;
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break;
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case AUDIO_U16LSB:
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info.play.encoding = AUDIO_ENCODING_ULINEAR_LE;
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info.play.precision = 16;
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prinfo->encoding = AUDIO_ENCODING_ULINEAR_LE;
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prinfo->precision = 16;
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break;
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case AUDIO_U16MSB:
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info.play.encoding = AUDIO_ENCODING_ULINEAR_BE;
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info.play.precision = 16;
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prinfo->encoding = AUDIO_ENCODING_ULINEAR_BE;
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prinfo->precision = 16;
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break;
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default:
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continue;
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@ -311,18 +368,20 @@ BSDAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
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this->spec.format = format;
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AUDIO_INITINFO(&info);
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info.play.channels = this->spec.channels;
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prinfo->channels = this->spec.channels;
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if (ioctl(this->hidden->audio_fd, AUDIO_SETINFO, &info) == -1) {
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this->spec.channels = 1;
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}
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AUDIO_INITINFO(&info);
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info.play.sample_rate = this->spec.freq;
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prinfo->sample_rate = this->spec.freq;
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info.blocksize = this->spec.size;
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info.hiwat = 5;
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info.lowat = 3;
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(void) ioctl(this->hidden->audio_fd, AUDIO_SETINFO, &info);
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(void) ioctl(this->hidden->audio_fd, AUDIO_GETINFO, &info);
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this->spec.freq = info.play.sample_rate;
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this->spec.freq = prinfo->sample_rate;
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if (!iscapture) {
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/* Allocate mixing buffer */
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this->hidden->mixlen = this->spec.size;
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this->hidden->mixbuf = (Uint8 *) SDL_AllocAudioMem(this->hidden->mixlen);
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@ -331,6 +390,7 @@ BSDAUDIO_OpenDevice(_THIS, void *handle, const char *devname, int iscapture)
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return SDL_OutOfMemory();
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}
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SDL_memset(this->hidden->mixbuf, this->spec.silence, this->spec.size);
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}
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BSDAUDIO_Status(this);
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@ -348,7 +408,10 @@ BSDAUDIO_Init(SDL_AudioDriverImpl * impl)
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impl->WaitDevice = BSDAUDIO_WaitDevice;
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impl->GetDeviceBuf = BSDAUDIO_GetDeviceBuf;
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impl->CloseDevice = BSDAUDIO_CloseDevice;
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impl->CaptureFromDevice = BSDAUDIO_CaptureFromDevice;
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impl->FlushCapture = BSDAUDIO_FlushCapture;
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impl->HasCaptureSupport = SDL_TRUE;
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impl->AllowsArbitraryDeviceNames = 1;
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return 1; /* this audio target is available. */
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