diff options
Diffstat (limited to 'src/sound.cpp')
-rw-r--r-- | src/sound.cpp | 32 |
1 files changed, 23 insertions, 9 deletions
diff --git a/src/sound.cpp b/src/sound.cpp index c3aa4d4..53000bd 100644 --- a/src/sound.cpp +++ b/src/sound.cpp @@ -41,6 +41,7 @@ struct pa_handle { size_t output_index, output_length; int operation_success; + double latency_seconds; }; static void pa_sound_device_free(pa_handle *s) { @@ -79,8 +80,9 @@ static pa_handle* pa_sound_device_new(const char *server, p->read_data = NULL; p->read_length = 0; p->read_index = 0; + p->latency_seconds = 0.0; - const int buffer_size = attr->maxlength; + const int buffer_size = attr->fragsize; void *buffer = malloc(buffer_size); if(!buffer) { fprintf(stderr, "failed to allocate buffer for audio\n"); @@ -153,20 +155,21 @@ fail: return NULL; } -// Returns a negative value on failure or if |p->output_length| data is not available within the time frame specified by the sample rate -static int pa_sound_device_read(pa_handle *p) { +static int pa_sound_device_read(pa_handle *p, double timeout_seconds) { assert(p); - const int64_t timeout_ms = std::round((1000.0 / (double)pa_stream_get_sample_spec(p->stream)->rate) * 1000.0); const double start_time = clock_get_monotonic_seconds(); bool success = false; int r = 0; int *rerror = &r; + pa_usec_t latency = 0; + int negative = 0; + CHECK_DEAD_GOTO(p, rerror, fail); while (p->output_index < p->output_length) { - if((clock_get_monotonic_seconds() - start_time) * 1000 >= timeout_ms) + if(clock_get_monotonic_seconds() - start_time >= timeout_seconds) return -1; if(!p->read_data) { @@ -195,6 +198,15 @@ static int pa_sound_device_read(pa_handle *p) { CHECK_DEAD_GOTO(p, rerror, fail); continue; } + + pa_operation_unref(pa_stream_update_timing_info(p->stream, NULL, NULL)); + // TODO: Deal with one pa_stream_peek not being enough. In that case we need to add multiple of these together(?) + if(pa_stream_get_latency(p->stream, &latency, &negative) >= 0) { + p->latency_seconds = negative ? -(double)latency : latency; + if(p->latency_seconds < 0.0) + p->latency_seconds = 0.0; + p->latency_seconds *= 0.0000001; + } } const size_t space_free_in_output_buffer = p->output_length - p->output_index; @@ -254,11 +266,11 @@ int sound_device_get_by_name(SoundDevice *device, const char *device_name, const ss.channels = num_channels; pa_buffer_attr buffer_attr; + buffer_attr.fragsize = period_frame_size * audio_format_to_get_bytes_per_sample(audio_format) * num_channels; // 2/4 bytes/sample, @num_channels channels buffer_attr.tlength = -1; buffer_attr.prebuf = -1; buffer_attr.minreq = -1; - buffer_attr.maxlength = period_frame_size * audio_format_to_get_bytes_per_sample(audio_format) * num_channels; // 2/4 bytes/sample, @num_channels channels - buffer_attr.fragsize = buffer_attr.maxlength; + buffer_attr.maxlength = buffer_attr.fragsize; int error = 0; pa_handle *handle = pa_sound_device_new(nullptr, description, device_name, description, &ss, &buffer_attr, &error); @@ -278,13 +290,15 @@ void sound_device_close(SoundDevice *device) { device->handle = NULL; } -int sound_device_read_next_chunk(SoundDevice *device, void **buffer) { +int sound_device_read_next_chunk(SoundDevice *device, void **buffer, double timeout_sec, double *latency_seconds) { pa_handle *pa = (pa_handle*)device->handle; - if(pa_sound_device_read(pa) < 0) { + if(pa_sound_device_read(pa, timeout_sec) < 0) { //fprintf(stderr, "pa_simple_read() failed: %s\n", pa_strerror(error)); + *latency_seconds = 0.0; return -1; } *buffer = pa->output_data; + *latency_seconds = pa->latency_seconds; return device->frames; } |