X-Git-Url: https://git.sesse.net/?a=blobdiff_plain;f=alsa_input.h;h=060b9212690fce317f9dfac701af37d597af908a;hb=ffd68fbfb90242069af957f2a28908f0559f8348;hp=724b64011749f01bc554cb720e3c095473113c3c;hpb=7460e2f2d678c9255afe914c1988f14c87798727;p=nageru

diff --git a/alsa_input.h b/alsa_input.h
index 724b640..060b921 100644
--- a/alsa_input.h
+++ b/alsa_input.h
@@ -10,23 +10,32 @@
 // as a whole, since that's what AudioMixer::add_audio() wants.
 
 #include <alsa/asoundlib.h>
-
+#include <stdint.h>
+#include <sys/types.h>
 #include <atomic>
+#include <chrono>
 #include <functional>
+#include <memory>
 #include <string>
 #include <thread>
-#include <vector>
 
 #include "bmusb/bmusb.h"
-#include "timebase.h"
+#include "quittable_sleeper.h"
+
+class ALSAPool;
 
 class ALSAInput {
 public:
-	typedef std::function<void(const uint8_t *data, unsigned num_samples, bmusb::AudioFormat audio_format, int64_t frame_length)> audio_callback_t;
+	typedef std::function<bool(const uint8_t *data, unsigned num_samples, bmusb::AudioFormat audio_format, int64_t frame_length, std::chrono::steady_clock::time_point ts)> audio_callback_t;
 
-	ALSAInput(const char *device, unsigned sample_rate, unsigned num_channels, audio_callback_t audio_callback);
+	ALSAInput(const char *device, unsigned sample_rate, unsigned num_channels, audio_callback_t audio_callback, ALSAPool *parent_pool, unsigned internal_dev_index);
 	~ALSAInput();
 
+	// If not called before start_capture_thread(), the capture thread
+	// will call it until it succeeds.
+	bool open_device();
+
+	// Not valid before the device has been successfully opened.
 	// NOTE: Might very well be different from the sample rate given to the
 	// constructor, since the card might not support the one you wanted.
 	unsigned get_sample_rate() const { return sample_rate; }
@@ -34,10 +43,22 @@ public:
 	void start_capture_thread();
 	void stop_capture_thread();
 
+	// Set access, sample rate and format parameters on the given ALSA PCM handle.
+	// Returns the computed parameter set and the chosen sample rate. Note that
+	// sample_rate is an in/out parameter; you send in the desired rate,
+	// and ALSA picks one as close to that as possible.
+	static bool set_base_params(const char *device_name, snd_pcm_t *pcm_handle, snd_pcm_hw_params_t *hw_params, unsigned *sample_rate);
+
 private:
 	void capture_thread_func();
 	int64_t frames_to_pts(uint64_t n) const;
-	void die_on_error(const char *func_name, int err);
+
+	enum class CaptureEndReason {
+		REQUESTED_QUIT,
+		DEVICE_GONE,
+		OTHER_ERROR
+	};
+	CaptureEndReason do_capture();
 
 	std::string device;
 	unsigned sample_rate, num_channels, num_periods;
@@ -46,10 +67,12 @@ private:
 	bmusb::AudioFormat audio_format;
 	audio_callback_t audio_callback;
 
-	snd_pcm_t *pcm_handle;
+	snd_pcm_t *pcm_handle = nullptr;
 	std::thread capture_thread;
-	std::atomic<bool> should_quit{false};
+	QuittableSleeper should_quit;
 	std::unique_ptr<uint8_t[]> buffer;
+	ALSAPool *parent_pool;
+	unsigned internal_dev_index;
 };
 
 #endif  // !defined(_ALSA_INPUT_H)