static size_t read_frames(void **frames)
{
unsigned int card = 0;
unsigned int device = 0;
int flags = PCM_IN;
const struct pcm_config config = {
.channels = 2,
.rate = 48000,
.format = PCM_FORMAT_S32_LE,
.period_size = 1024,
.period_count = 2,
.start_threshold = 1024,
.silence_threshold = 1024 * 2,
.stop_threshold = 1024 * 2
};
struct pcm *pcm = pcm_open(card, device, flags, &config);
if (pcm == NULL) {
fprintf(stderr, "failed to allocate memory for PCM\n");
return EXIT_FAILURE;
} else if (!pcm_is_ready(pcm)){
pcm_close(pcm);
fprintf(stderr, "failed to open PCM\n");
return EXIT_FAILURE;
}
unsigned int frame_size = pcm_frames_to_bytes(pcm, 1);
unsigned int frames_per_sec = pcm_get_rate(pcm);
*frames = malloc(frame_size * frames_per_sec);
if (*frames == NULL) {
fprintf(stderr, "failed to allocate frames\n");
pcm_close(pcm);
return EXIT_FAILURE;
}
int read_count = pcm_readi(pcm, *frames, frames_per_sec);
size_t byte_count = pcm_frames_to_bytes(pcm, read_count);
pcm_close(pcm);
return byte_count;
}
static int write_file(const void *frames, size_t size)
{
FILE *output_file = fopen("audio.raw", "wb");
if (output_file == NULL) {
perror("failed to open 'audio.raw' for writing");
return EXIT_FAILURE;
}
fwrite(frames, 1, size, output_file);
fclose(output_file);
return 0;
}
audio_t *
audio_new(audio_config_t *cfg, audio_device_t *device)
{
struct pcm_config config;
struct pcm *pcm;
audio_t *c;
if (cfg->bits != 16 && cfg->bits != 24 && cfg->bits != 32) {
errno = EINVAL;
return NULL;
}
config.channels = cfg->channels;
config.rate = cfg->rate;
config.period_size = 1024;
config.period_count = 4;
config.format = cfg->bits == 16 ? PCM_FORMAT_S16_LE : cfg->bits == 32 ? PCM_FORMAT_S32_LE : PCM_FORMAT_S24_LE;
config.start_threshold = config.stop_threshold = config.silence_threshold = 0;
if ((pcm = pcm_open(device->card, device->device, device->playback ? PCM_OUT : PCM_IN, &config)) == NULL ||
! pcm_is_ready(pcm))
{
fprintf(stderr, "Failed to open: %s\n", pcm_get_error(pcm));
return NULL;
}
c = fatal_malloc(sizeof(*c));
c->pcm = pcm;
c->cfg = *cfg;
c->dev = *device;
c->buffer_size = pcm_frames_to_bytes(pcm, pcm_get_buffer_size(pcm));
return c;
}
unsigned int capture_sample(FILE *file, unsigned int card, unsigned int device,
unsigned int channels, unsigned int rate,
enum pcm_format format, unsigned int period_size,
unsigned int period_count)
{
struct pcm_config config;
struct pcm *pcm;
char *buffer;
unsigned int size;
unsigned int bytes_read = 0;
memset(&config, 0, sizeof(config));
config.channels = channels;
config.rate = rate;
config.period_size = period_size;
config.period_count = period_count;
config.format = format;
config.start_threshold = 0;
config.stop_threshold = 0;
config.silence_threshold = 0;
pcm = pcm_open(card, device, PCM_IN, &config);
if (!pcm || !pcm_is_ready(pcm)) {
fprintf(stderr, "Unable to open PCM device (%s)\n",
pcm_get_error(pcm));
return 0;
}
size = pcm_frames_to_bytes(pcm, pcm_get_buffer_size(pcm));
buffer = malloc(size);
if (!buffer) {
fprintf(stderr, "Unable to allocate %d bytes\n", size);
free(buffer);
pcm_close(pcm);
return 0;
}
printf("Capturing sample: %u ch, %u hz, %u bit\n", channels, rate,
pcm_format_to_bits(format));
while (capturing && !pcm_read(pcm, buffer, size)) {
if (fwrite(buffer, 1, size, file) != size) {
fprintf(stderr,"Error capturing sample\n");
break;
}
bytes_read += size;
}
free(buffer);
pcm_close(pcm);
return pcm_bytes_to_frames(pcm, bytes_read);
}
static gboolean
gst_tinyalsa_sink_prepare (GstAudioSink * asink, GstAudioRingBufferSpec * spec)
{
GstTinyalsaSink *sink = GST_TINYALSA_SINK (asink);
struct pcm_config config = { 0, };
struct pcm_params *params = NULL;
int period_size_min, period_size_max;
int periods_min, periods_max;
pcm_config_from_spec (&config, spec);
GST_DEBUG_OBJECT (sink, "Requesting %u periods of %u frames",
config.period_count, config.period_size);
params = pcm_params_get (sink->card, sink->device, PCM_OUT);
if (!params)
GST_ERROR_OBJECT (sink, "Could not get PCM params");
period_size_min = pcm_params_get_min (params, PCM_PARAM_PERIOD_SIZE);
period_size_max = pcm_params_get_max (params, PCM_PARAM_PERIOD_SIZE);
periods_min = pcm_params_get_min (params, PCM_PARAM_PERIODS);
periods_max = pcm_params_get_max (params, PCM_PARAM_PERIODS);
pcm_params_free (params);
/* Snap period size/count to the permitted range */
config.period_size =
CLAMP (config.period_size, period_size_min, period_size_max);
config.period_count = CLAMP (config.period_count, periods_min, periods_max);
/* mutex with getcaps */
GST_OBJECT_LOCK (sink);
sink->pcm = pcm_open (sink->card, sink->device, PCM_OUT | PCM_NORESTART,
&config);
GST_OBJECT_UNLOCK (sink);
if (!sink->pcm || !pcm_is_ready (sink->pcm)) {
GST_ERROR_OBJECT (sink, "Could not open device: %s",
pcm_get_error (sink->pcm));
goto fail;
}
if (pcm_prepare (sink->pcm) < 0) {
GST_ERROR_OBJECT (sink, "Could not prepare device: %s",
pcm_get_error (sink->pcm));
goto fail;
}
spec->segsize = pcm_frames_to_bytes (sink->pcm, config.period_size);
spec->segtotal = config.period_count;
GST_DEBUG_OBJECT (sink, "Configured for %u periods of %u frames",
config.period_count, config.period_size);
return TRUE;
fail:
if (sink->pcm)
pcm_close (sink->pcm);
return FALSE;
}
bool AudioPlayer::threadLoop()
{
struct pcm_config config;
struct pcm *pcm = NULL;
bool moreChunks = true;
const struct chunk_fmt* chunkFmt = NULL;
int bufferSize;
const uint8_t* wavData;
size_t wavLength;
const struct riff_wave_header* wavHeader;
if (mCurrentFile == NULL) {
ALOGE("mCurrentFile is NULL");
return false;
}
wavData = (const uint8_t *)mCurrentFile->getDataPtr();
if (!wavData) {
ALOGE("Could not access WAV file data");
goto exit;
}
wavLength = mCurrentFile->getDataLength();
wavHeader = (const struct riff_wave_header *)wavData;
if (wavLength < sizeof(*wavHeader) || (wavHeader->riff_id != ID_RIFF) ||
(wavHeader->wave_id != ID_WAVE)) {
ALOGE("Error: audio file is not a riff/wave file\n");
goto exit;
}
wavData += sizeof(*wavHeader);
wavLength -= sizeof(*wavHeader);
do {
const struct chunk_header* chunkHeader = (const struct chunk_header*)wavData;
if (wavLength < sizeof(*chunkHeader)) {
ALOGE("EOF reading chunk headers");
goto exit;
}
wavData += sizeof(*chunkHeader);
wavLength -= sizeof(*chunkHeader);
switch (chunkHeader->id) {
case ID_FMT:
chunkFmt = (const struct chunk_fmt *)wavData;
wavData += chunkHeader->sz;
wavLength -= chunkHeader->sz;
break;
case ID_DATA:
/* Stop looking for chunks */
moreChunks = 0;
break;
default:
/* Unknown chunk, skip bytes */
wavData += chunkHeader->sz;
wavLength -= chunkHeader->sz;
}
} while (moreChunks);
if (!chunkFmt) {
ALOGE("format not found in WAV file");
goto exit;
}
memset(&config, 0, sizeof(config));
config.channels = chunkFmt->num_channels;
config.rate = chunkFmt->sample_rate;
config.period_size = mPeriodSize;
config.period_count = mPeriodCount;
config.start_threshold = mPeriodSize / 4;
config.stop_threshold = INT_MAX;
config.avail_min = config.start_threshold;
if (chunkFmt->bits_per_sample != 16) {
ALOGE("only 16 bit WAV files are supported");
goto exit;
}
config.format = PCM_FORMAT_S16_LE;
pcm = pcm_open(mCard, mDevice, PCM_OUT, &config);
if (!pcm || !pcm_is_ready(pcm)) {
ALOGE("Unable to open PCM device (%s)\n", pcm_get_error(pcm));
goto exit;
}
bufferSize = pcm_frames_to_bytes(pcm, pcm_get_buffer_size(pcm));
while (wavLength > 0) {
if (exitPending()) goto exit;
size_t count = bufferSize;
if (count > wavLength)
count = wavLength;
if (pcm_write(pcm, wavData, count)) {
ALOGE("pcm_write failed (%s)", pcm_get_error(pcm));
goto exit;
}
wavData += count;
wavLength -= count;
}
exit:
if (pcm)
pcm_close(pcm);
mCurrentFile->release();
mCurrentFile = NULL;
return false;
}
void play_sample(FILE *file, unsigned int card, unsigned int device, unsigned int channels,
unsigned int rate, unsigned int bits, unsigned int period_size,
unsigned int period_count)
{
struct pcm_config config;
struct pcm *pcm;
char *buffer;
int size;
int num_read;
memset(&config, 0, sizeof(config));
config.channels = channels;
config.rate = rate;
config.period_size = period_size;
config.period_count = period_count;
if (bits == 32)
config.format = PCM_FORMAT_S32_LE;
else if (bits == 16)
config.format = PCM_FORMAT_S16_LE;
config.start_threshold = 0;
config.stop_threshold = 0;
config.silence_threshold = 0;
if (!sample_is_playable(card, device, channels, rate, bits, period_size, period_count)) {
return;
}
pcm = pcm_open(card, device, PCM_OUT, &config);
if (!pcm || !pcm_is_ready(pcm)) {
fprintf(stderr, "Unable to open PCM device %u (%s)\n",
device, pcm_get_error(pcm));
return;
}
size = pcm_frames_to_bytes(pcm, pcm_get_buffer_size(pcm));
buffer = malloc(size);
if (!buffer) {
fprintf(stderr, "Unable to allocate %d bytes\n", size);
free(buffer);
pcm_close(pcm);
return;
}
printf("Playing sample: %u ch, %u hz, %u bit\n", channels, rate, bits);
/* catch ctrl-c to shutdown cleanly */
signal(SIGINT, stream_close);
do {
num_read = fread(buffer, 1, size, file);
if (num_read > 0) {
if (pcm_write(pcm, buffer, num_read)) {
fprintf(stderr, "Error playing sample\n");
break;
}
}
} while (!close && num_read > 0);
free(buffer);
pcm_close(pcm);
}
