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#ifndef ALFFMPEG_H
#define ALFFMPEG_H
#ifdef __cplusplus
extern "C" {
#endif /* __cplusplus */
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
/* Opaque handles to files and streams. Apps don't need to concern themselves
* with the internals */
typedef struct MyFile *FilePtr;
typedef struct MyStream *StreamPtr;
/* Opens a file with ffmpeg and sets up the streams' information */
FilePtr openAVFile(const char *fname);
/* Opens a named file image with ffmpeg and sets up the streams' information */
FilePtr openAVData(const char *name, char *buffer, size_t buffer_len);
/* Opens a named data stream with ffmpeg, using the specified data pointer and
* callbacks, and sets up the streams' information */
FilePtr openAVCustom(const char *name, void *user_data,
int (*read_packet)(void *user_data, uint8_t *buf, int buf_size),
int (*write_packet)(void *user_data, uint8_t *buf, int buf_size),
int64_t (*seek)(void *user_data, int64_t offset, int whence));
/* Closes/frees an opened file and any of its streams */
void closeAVFile(FilePtr file);
/* Reports certain information from the file, eg, the number of audio
* streams. Returns 0 on success. */
int getAVFileInfo(FilePtr file, int *numaudiostreams);
/* Retrieves a handle for the given audio stream number (generally 0, but some
* files can have multiple audio streams in one file). */
StreamPtr getAVAudioStream(FilePtr file, int streamnum);
/* Returns information about the given audio stream. Returns 0 on success. */
int getAVAudioInfo(StreamPtr stream, ALuint *rate, ALenum *channels, ALenum *type);
/* Returns a pointer to the next available packet of decoded audio. Any data
* from a previously-decoded packet is dropped. The size (in bytes) of the
* returned data buffer is stored in 'length', and the returned pointer is only
* valid until the next call to getAVAudioData or readAVAudioData. */
void *getAVAudioData(StreamPtr stream, size_t *length);
/* The "meat" function. Decodes audio and writes, at most, length bytes into
* the provided data buffer. Will only return less for end-of-stream or error
* conditions. Returns the number of bytes written. */
size_t readAVAudioData(StreamPtr stream, void *data, size_t length);
/* Decodes all remaining data from the stream and returns a buffer containing
* the audio data, with the size stored in 'length'. The returned pointer must
* be freed with a call to free(). Note that since this decodes the whole
* stream, using it on lengthy streams (eg, music) will use a lot of memory.
* Such streams are better handled using getAVAudioData or readAVAudioData to
* keep smaller chunks in memory at any given time. */
void *decodeAVAudioStream(StreamPtr stream, size_t *length);
#ifdef __cplusplus
}
#endif /* __cplusplus */
#endif /* ALFFMPEG_H */
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