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cubeb_sink: Support variable sample_rate and num_channels.

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This commit is contained in:
bunnei 2018-08-03 14:50:53 -04:00
parent 34b3f83498
commit 02fccc0940
1 changed files with 26 additions and 16 deletions
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42
src/audio_core/cubeb_sink.cpp
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@ -13,14 +13,24 @@ namespace AudioCore {
class SinkStreamImpl final : public SinkStream { class SinkStreamImpl final : public SinkStream {
public: public:
SinkStreamImpl(cubeb* ctx, cubeb_devid output_device, const std::string& name) : ctx{ctx} { SinkStreamImpl(cubeb* ctx, u32 sample_rate, u32 num_channels_, cubeb_devid output_device,
cubeb_stream_params params; const std::string& name)
params.rate = 48000; : ctx{ctx}, num_channels{num_channels_} {
params.channels = GetNumChannels();
params.format = CUBEB_SAMPLE_S16NE;
params.layout = CUBEB_LAYOUT_STEREO;
u32 minimum_latency = 0; if (num_channels == 6) {
// 6-channel audio does not seem to work with cubeb + SDL, so we downsample this to 2
// channel for now
is_6_channel = true;
num_channels = 2;
}
cubeb_stream_params params{};
params.rate = sample_rate;
params.channels = num_channels;
params.format = CUBEB_SAMPLE_S16NE;
params.layout = num_channels == 1 ? CUBEB_LAYOUT_MONO : CUBEB_LAYOUT_STEREO;
u32 minimum_latency{};
if (cubeb_get_min_latency(ctx, &params, &minimum_latency) != CUBEB_OK) { if (cubeb_get_min_latency(ctx, &params, &minimum_latency) != CUBEB_OK) {
LOG_CRITICAL(Audio_Sink, "Error getting minimum latency"); LOG_CRITICAL(Audio_Sink, "Error getting minimum latency");
} }
@ -58,11 +68,7 @@ public:
queue.reserve(queue.size() + sample_count * GetNumChannels()); queue.reserve(queue.size() + sample_count * GetNumChannels());
if (num_channels == 2) { if (is_6_channel) {
// Copy as-is
std::copy(samples, samples + sample_count * GetNumChannels(),
std::back_inserter(queue));
} else if (num_channels == 6) {
// Downsample 6 channels to 2 // Downsample 6 channels to 2
const size_t sample_count_copy_size = sample_count * num_channels * 2; const size_t sample_count_copy_size = sample_count * num_channels * 2;
queue.reserve(sample_count_copy_size); queue.reserve(sample_count_copy_size);
@ -71,13 +77,14 @@ public:
queue.push_back(samples[i + 1]); queue.push_back(samples[i + 1]);
} }
} else { } else {
ASSERT_MSG(false, "Unimplemented"); // Copy as-is
std::copy(samples, samples + sample_count * GetNumChannels(),
std::back_inserter(queue));
} }
} }
u32 GetNumChannels() const { u32 GetNumChannels() const {
// Only support 2-channel stereo output for now return num_channels;
return 2;
} }
private: private:
@ -85,6 +92,8 @@ private:
cubeb* ctx{}; cubeb* ctx{};
cubeb_stream* stream_backend{}; cubeb_stream* stream_backend{};
u32 num_channels{};
bool is_6_channel{};
std::vector<s16> queue; std::vector<s16> queue;
@ -131,7 +140,8 @@ CubebSink::~CubebSink() {
SinkStream& CubebSink::AcquireSinkStream(u32 sample_rate, u32 num_channels, SinkStream& CubebSink::AcquireSinkStream(u32 sample_rate, u32 num_channels,
const std::string& name) { const std::string& name) {
sink_streams.push_back(std::make_unique<SinkStreamImpl>(ctx, output_device, name)); sink_streams.push_back(
std::make_unique<SinkStreamImpl>(ctx, sample_rate, num_channels, output_device, name));
return *sink_streams.back(); return *sink_streams.back();
} }