static ssize_t in_read(struct audio_stream_in *stream, void* buffer,
size_t bytes)
{
/* XXX: fake timing for audio input */
usleep(bytes * 1000000 / audio_stream_in_frame_size(stream) /
in_get_sample_rate(&stream->common));
return bytes;
}
static ssize_t in_read(struct audio_stream_in *stream, void *buffer,
size_t bytes)
{
struct stream_in *in = (struct stream_in *)stream;
struct audio_device *adev = in->dev;
int i, ret = -1;
ALOGV("%s enter",__func__);
pthread_mutex_lock(&in->lock);
if (in->standby) {
pthread_mutex_lock(&adev->lock);
ret = start_input_stream(in);
pthread_mutex_unlock(&adev->lock);
if (ret != 0) {
goto exit;
}
in->standby = false;
}
if (in->pcm) {
ret = pcm_read(in->pcm, buffer, bytes);
}
ALOGV("in_read returned %d bytes ret = %d",bytes,ret);
exit:
pthread_mutex_unlock(&in->lock);
if (ret != 0) {
in_standby(&in->stream.common);
uint64_t duration_ms = ((bytes * 1000)/
(audio_stream_frame_size(&in->stream.common)) /
(in_get_sample_rate(&in->stream.common)));
ALOGV("%s : silence read - read failed", __func__);
usleep(duration_ms * 1000);
}
ALOGV("%s exit",__func__);
return bytes;
}
static ssize_t in_read(struct audio_stream_in *stream, void* buffer,
size_t bytes)
{
//ALOGV("in_read bytes=%u", bytes);
ssize_t frames_read = -1977;
struct submix_stream_in *in = reinterpret_cast<struct submix_stream_in *>(stream);
const size_t frame_size = audio_stream_frame_size(&stream->common);
const size_t frames_to_read = bytes / frame_size;
pthread_mutex_lock(&in->dev->lock);
const bool output_standby_transition = (in->output_standby != in->dev->output_standby);
in->output_standby = in->dev->output_standby;
if (in->dev->input_standby || output_standby_transition) {
in->dev->input_standby = false;
// keep track of when we exit input standby (== first read == start "real recording")
// or when we start recording silence, and reset projected time
int rc = clock_gettime(CLOCK_MONOTONIC, &in->record_start_time);
if (rc == 0) {
in->read_counter_frames = 0;
}
}
in->read_counter_frames += frames_to_read;
size_t remaining_frames = frames_to_read;
{
// about to read from audio source
sp<MonoPipeReader> source = in->dev->rsxSource.get();
if (source == 0) {
ALOGE("no audio pipe yet we're trying to read!");
pthread_mutex_unlock(&in->dev->lock);
usleep((bytes / frame_size) * 1000000 / in_get_sample_rate(&stream->common));
memset(buffer, 0, bytes);
return bytes;
}
pthread_mutex_unlock(&in->dev->lock);
// read the data from the pipe (it's non blocking)
int attempts = 0;
char* buff = (char*)buffer;
while ((remaining_frames > 0) && (attempts < MAX_READ_ATTEMPTS)) {
attempts++;
frames_read = source->read(buff, remaining_frames, AudioBufferProvider::kInvalidPTS);
if (frames_read > 0) {
remaining_frames -= frames_read;
buff += frames_read * frame_size;
//ALOGV(" in_read (att=%d) got %ld frames, remaining=%u",
// attempts, frames_read, remaining_frames);
} else {
//ALOGE(" in_read read returned %ld", frames_read);
usleep(READ_ATTEMPT_SLEEP_MS * 1000);
}
}
// done using the source
pthread_mutex_lock(&in->dev->lock);
source.clear();
pthread_mutex_unlock(&in->dev->lock);
}
if (remaining_frames > 0) {
ALOGV(" remaining_frames = %d", remaining_frames);
memset(((char*)buffer)+ bytes - (remaining_frames * frame_size), 0,
remaining_frames * frame_size);
}
// compute how much we need to sleep after reading the data by comparing the wall clock with
// the projected time at which we should return.
struct timespec time_after_read;// wall clock after reading from the pipe
struct timespec record_duration;// observed record duration
int rc = clock_gettime(CLOCK_MONOTONIC, &time_after_read);
const uint32_t sample_rate = in_get_sample_rate(&stream->common);
if (rc == 0) {
// for how long have we been recording?
record_duration.tv_sec = time_after_read.tv_sec - in->record_start_time.tv_sec;
record_duration.tv_nsec = time_after_read.tv_nsec - in->record_start_time.tv_nsec;
if (record_duration.tv_nsec < 0) {
record_duration.tv_sec--;
record_duration.tv_nsec += 1000000000;
}
// read_counter_frames contains the number of frames that have been read since the beginning
// of recording (including this call): it's converted to usec and compared to how long we've
// been recording for, which gives us how long we must wait to sync the projected recording
// time, and the observed recording time
long projected_vs_observed_offset_us =
((int64_t)(in->read_counter_frames
- (record_duration.tv_sec*sample_rate)))
* 1000000 / sample_rate
- (record_duration.tv_nsec / 1000);
ALOGV(" record duration %5lds %3ldms, will wait: %7ldus",
record_duration.tv_sec, record_duration.tv_nsec/1000000,
projected_vs_observed_offset_us);
if (projected_vs_observed_offset_us > 0) {
usleep(projected_vs_observed_offset_us);
}
}
ALOGV("in_read returns %d", bytes);
return bytes;
}
