avcodec.h

                         int *got_picture_ptr,
                         UINT8 *buf, int buf_size);
int avcodec_parse_frame(AVCodecContext *avctx, UINT8 **pdata, 
                        int *data_size_ptr,
                        UINT8 *buf, int buf_size);
int avcodec_encode_audio(AVCodecContext *avctx, UINT8 *buf, int buf_size, 
                         const short *samples);
int avcodec_encode_video(AVCodecContext *avctx, UINT8 *buf, int buf_size, 
                         const AVVideoFrame *pict);

int avcodec_close(AVCodecContext *avctx);

void avcodec_register_all(void);

void avcodec_flush_buffers(AVCodecContext *avctx);

/**
 * Interface for 0.5.0 version
 *
 * do not even think about it's usage for this moment
 */

typedef struct {
    // compressed size used from given memory buffer
    int size;
    /// I/P/B frame type
    int frame_type;
} avc_enc_result_t;

/**
 * Commands
 * order can't be changed - once it was defined
 */
typedef enum {
    // general commands
    AVC_OPEN_BY_NAME = 0xACA000,
    AVC_OPEN_BY_CODEC_ID,
    AVC_OPEN_BY_FOURCC,
    AVC_CLOSE,

    AVC_FLUSH,
    // pin - struct { uint8_t* src, uint_t src_size }
    // pout - struct { AVPicture* img, consumed_bytes,
    AVC_DECODE,
    // pin - struct { AVPicture* img, uint8_t* dest, uint_t dest_size }
    // pout - uint_t used_from_dest_size
    AVC_ENCODE, 

    // query/get video commands
    AVC_GET_VERSION = 0xACB000,
    AVC_GET_WIDTH,
    AVC_GET_HEIGHT,
    AVC_GET_DELAY,
    AVC_GET_QUANT_TABLE,
    // ...

    // query/get audio commands
    AVC_GET_FRAME_SIZE = 0xABC000,

    // maybe define some simple structure which
    // might be passed to the user - but they can't
    // contain any codec specific parts and these
    // calls are usualy necessary only few times

    // set video commands
    AVC_SET_WIDTH = 0xACD000,
    AVC_SET_HEIGHT,

    // set video encoding commands
    AVC_SET_FRAME_RATE = 0xACD800,
    AVC_SET_QUALITY,
    AVC_SET_HURRY_UP,

    // set audio commands
    AVC_SET_SAMPLE_RATE = 0xACE000,
    AVC_SET_CHANNELS,

} avc_cmd_t;

/**
 * \param handle  allocated private structure by libavcodec
 *                for initialization pass NULL - will be returned pout
 *                user is supposed to know nothing about its structure
 * \param cmd     type of operation to be performed
 * \param pint    input parameter
 * \param pout    output parameter
 *
 * \returns  command status - eventually for query command it might return
 * integer resulting value
 */
int avcodec(void* handle, avc_cmd_t cmd, void* pin, void* pout);

/* memory */
void *av_malloc(unsigned int size);
void *av_mallocz(unsigned int size);
void av_free(void *ptr);
void __av_freep(void **ptr);
#define av_freep(p) __av_freep((void **)(p))
/* for static data only */
/* call av_free_static to release all staticaly allocated tables */
void av_free_static();
void *__av_mallocz_static(void** location, unsigned int size);
#define av_mallocz_static(p, s) __av_mallocz_static((void **)(p), s)

#endif /* AVCODEC_H */