Make AudioMixer ready for indexing on multiple types of devices.

[nageru] / audio_mixer.h

diff --git a/audio_mixer.h b/audio_mixer.h
index fe1f6ecdb0e04b2fed07c2107b3599e0c0d14218..c7841fbdf32125116803af67dfffe4d0f3c66a34 100644 (file)
--- a/audio_mixer.h
+++ b/audio_mixer.h
@@ -32,12 +32,15 @@ struct AudioFormat;
 }  // namespace bmusb
 
 enum class InputSourceType { SILENCE, CAPTURE_CARD };
+struct DeviceSpec {
+       InputSourceType type;
+       unsigned index;
+};
 
 struct InputMapping {
        struct Bus {
                std::string name;
-               InputSourceType input_source_type;
-               unsigned input_source_index;
+               DeviceSpec device;
                int source_channel[2] { -1, -1 };  // Left and right. -1 = none.
        };
 
@@ -47,11 +50,11 @@ struct InputMapping {
 class AudioMixer {
 public:
        AudioMixer(unsigned num_cards);
-       void reset_card(unsigned card_index);
+       void reset_device(DeviceSpec device_spec);
 
        // frame_length is in TIMEBASE units.
-       void add_audio(unsigned card_index, const uint8_t *data, unsigned num_samples, bmusb::AudioFormat audio_format, int64_t frame_length);
-       void add_silence(unsigned card_index, unsigned samples_per_frame, unsigned num_frames, int64_t frame_length);
+       void add_audio(DeviceSpec device_spec, const uint8_t *data, unsigned num_samples, bmusb::AudioFormat audio_format, int64_t frame_length);
+       void add_silence(DeviceSpec device_spec, unsigned samples_per_frame, unsigned num_frames, int64_t frame_length);
        std::vector<float> get_output(double pts, unsigned num_samples, ResamplingQueue::RateAdjustmentPolicy rate_adjustment_policy);
 
        // See comments inside get_output().
@@ -59,7 +62,7 @@ public:
 
        void set_fader_volume(unsigned bus_index, float level_db) { fader_volume_db[bus_index] = level_db; }
        std::vector<std::string> get_names() const;
-       void set_name(unsigned card_index, const std::string &name);
+       void set_name(DeviceSpec device_spec, const std::string &name);
 
        void set_input_mapping(const InputMapping &input_mapping);
        InputMapping get_input_mapping() const;
@@ -170,22 +173,24 @@ public:
        }
 
 private:
-       void find_sample_src_from_capture_card(const std::vector<float> *samples_card, unsigned card_index, int source_channel, const float **srcptr, unsigned *stride);
-       void fill_audio_bus(const std::vector<float> *samples_card, const InputMapping::Bus &bus, unsigned num_samples, float *output);
-       void reset_card_mutex_held(unsigned card_index);
-
-       unsigned num_cards;
-
-       mutable std::mutex audio_mutex;
-
-       struct CaptureCard {
+       struct AudioDevice {
                std::unique_ptr<ResamplingQueue> resampling_queue;
                int64_t next_local_pts = 0;
                std::string name;
                // Which channels we consider interesting (ie., are part of some input_mapping).
                std::set<unsigned> interesting_channels;
        };
-       CaptureCard cards[MAX_CARDS];  // Under audio_mutex.
+       AudioDevice *find_audio_device(DeviceSpec device_spec);
+
+       void find_sample_src_from_device(const std::vector<float> *samples_card, DeviceSpec device_spec, int source_channel, const float **srcptr, unsigned *stride);
+       void fill_audio_bus(const std::vector<float> *samples_card, const InputMapping::Bus &bus, unsigned num_samples, float *output);
+       void reset_device_mutex_held(DeviceSpec device_spec);
+
+       unsigned num_cards;
+
+       mutable std::mutex audio_mutex;
+
+       AudioDevice cards[MAX_CARDS];  // Under audio_mutex.
 
        StereoFilter locut;  // Default cutoff 120 Hz, 24 dB/oct.
        std::atomic<float> locut_cutoff_hz;