1 files changed, 128 insertions, 0 deletions
diff --git a/scene/resources/audio_stream_sample.h b/scene/resources/audio_stream_sample.h
new file mode 100644
index 0000000000..8c1e74608b
--- /dev/null
+++ b/scene/resources/audio_stream_sample.h
@@ -0,0 +1,128 @@
+#ifndef AUDIOSTREAMSAMPLE_H
+#define AUDIOSTREAMSAMPLE_H
+
+#include "servers/audio/audio_stream.h"
+
+
+class AudioStreamSample;
+
+class AudioStreamPlaybackSample : public AudioStreamPlayback {
+
+	GDCLASS( AudioStreamPlaybackSample, AudioStreamPlayback )
+	enum {
+		MIX_FRAC_BITS=13,
+		MIX_FRAC_LEN=(1<<MIX_FRAC_BITS),
+		MIX_FRAC_MASK=MIX_FRAC_LEN-1,
+	};
+
+	struct IMA_ADPCM_State {
+
+		int16_t step_index;
+		int32_t predictor;
+		/* values at loop point */
+		int16_t loop_step_index;
+		int32_t loop_predictor;
+		int32_t last_nibble;
+		int32_t loop_pos;
+		int32_t window_ofs;
+		const uint8_t *ptr;
+	} ima_adpcm[2];
+
+	int64_t offset;
+	int sign;
+	bool active;
+friend class AudioStreamSample;
+	Ref<AudioStreamSample> base;
+
+	template<class Depth,bool is_stereo,bool is_ima_adpcm>
+	void do_resample(const Depth* p_src, AudioFrame *p_dst,int64_t &offset,int32_t &increment,uint32_t amount,IMA_ADPCM_State *ima_adpcm);
+public:
+
+	virtual void start(float p_from_pos=0.0);
+	virtual void stop();
+	virtual bool is_playing() const;
+
+	virtual int get_loop_count() const; //times it looped
+
+	virtual float get_pos() const;
+	virtual void seek_pos(float p_time);
+
+	virtual void mix(AudioFrame* p_buffer,float p_rate_scale,int p_frames);
+
+	virtual float get_length() const; //if supported, otherwise return 0
+
+
+	AudioStreamPlaybackSample();
+};
+
+class AudioStreamSample : public AudioStream {
+	GDCLASS(AudioStreamSample,AudioStream)
+	RES_BASE_EXTENSION("smp")
+
+public:
+
+	enum Format {
+		FORMAT_8_BITS,
+		FORMAT_16_BITS,
+		FORMAT_IMA_ADPCM
+	};
+
+	enum LoopMode {
+		LOOP_DISABLED,
+		LOOP_FORWARD,
+		LOOP_PING_PONG
+	};
+
+
+private:
+friend class AudioStreamPlaybackSample;
+
+	enum {
+		DATA_PAD=16 //padding for interpolation
+	};
+
+	Format format;
+	LoopMode loop_mode;
+	bool stereo;
+	int loop_begin;
+	int loop_end;
+	int mix_rate;
+	void *data;
+	uint32_t data_bytes;
+protected:
+
+	static void _bind_methods();
+public:
+	void set_format(Format p_format);
+	Format get_format() const;
+
+	void set_loop_mode(LoopMode p_loop_mode);
+	LoopMode get_loop_mode() const;
+
+	void set_loop_begin(int p_frame);
+	int get_loop_begin() const;
+
+	void set_loop_end(int p_frame);
+	int get_loop_end() const;
+
+	void set_mix_rate(int p_hz);
+	int get_mix_rate() const;
+
+	void set_stereo(bool p_enable);
+	bool is_stereo() const;
+
+	void set_data(const PoolVector<uint8_t>& p_data);
+	PoolVector<uint8_t> get_data() const;
+
+
+	virtual Ref<AudioStreamPlayback> instance_playback();
+	virtual String get_stream_name() const;
+
+	AudioStreamSample();
+	~AudioStreamSample();
+};
+
+VARIANT_ENUM_CAST(AudioStreamSample::Format)
+VARIANT_ENUM_CAST(AudioStreamSample::LoopMode)
+
+#endif // AUDIOSTREAMSample_H