#ifndef AUDIO_MUXER_H_
#define AUDIO_MUXER_H_

#include <libavformat/avformat.h>
#include <libavutil/frame.h>

/**
 * An AudioMuxer is responsible for attaching and managing an audio stream to an
 * FFMPEG AVFormatContext instance. Ultimately, AudioMuxer allows users to pass
 * amorphous FFMPEG audio packets to an AvFormatContext without worrying about
 * encoding or sample count, and to enable silent streaming.
 */
typedef struct AudioMuxer AudioMuxer;

struct AudioMuxerOpt {
	int                  sample_rate;
	enum AVSampleFormat  sample_format;
	enum AVCodecID       codec_id;
	AVChannelLayout      ch_layout;
	AVDictionary       **opts_muxer;
	AVDictionary       **opts_encoder;
};

#define AUDIO_MUXER_OPT_DEFAULTS\
	.sample_rate   = 44100,\
	.sample_format = 0,\
	.codec_id      = 0,\
	.ch_layout     = 0,\
	.opts_muxer    = NULL,\
	.opts_encoder  = NULL

/**
 * Initialize **pmuxer using the parameters passed by *opts and attach an audio
 * stream to *avctx. This function mearly configures the output front of the
 * remuxer (i.e. a stream, an encoder, and part of a resmapler), and a second
 * call to audiomuxer_conf must be dispatched before sending in packets. Return
 * 0 on success, or a negative AVERROR on failure.
 */
int audiomuxer_init(AudioMuxer **pmuxer, AVFormatContext *avctx, const struct AudioMuxerOpt *opts);

/**
 * Configure *muxer to process input from a given *input stream. Internally,
 * this function allocate a decoder and configure the remuxer's resampler to
 * suite *input's codec and sample rate. Return 0 on success, or a negative
 * AVERROR on failure.
 */
int audiomuxer_conf(AudioMuxer *muxer, const AVStream *input);

int      audiomuxer_send_packet  (AudioMuxer *muxer, const AVPacket *pkt_in);
int      audiomuxer_send_silence (AudioMuxer *muxer, unsigned int microsec);
uint64_t audiomuxer_get_runtime  (const AudioMuxer *muxer);
void     audiomuxer_free         (AudioMuxer *muxer);

#endif // AUDIO_MUXER_H_