FFmpeg/libavcodec/avcodec.h

#ifndef AVCODEC_H
#define AVCODEC_H

#include "common.h"

enum CodecID {
    CODEC_ID_NONE, 
    CODEC_ID_MPEG1VIDEO,
    CODEC_ID_H263,
    CODEC_ID_RV10,
    CODEC_ID_MP2,
    CODEC_ID_MP3LAME,
    CODEC_ID_AC3,
    CODEC_ID_MJPEG,
    CODEC_ID_MPEG4,
    CODEC_ID_RAWVIDEO,
    CODEC_ID_MSMPEG4,
    CODEC_ID_H263P,
    CODEC_ID_H263I,

    /* various pcm "codecs" */
    CODEC_ID_PCM_S16LE,
    CODEC_ID_PCM_S16BE,
    CODEC_ID_PCM_U16LE,
    CODEC_ID_PCM_U16BE,
    CODEC_ID_PCM_S8,
    CODEC_ID_PCM_U8,
    CODEC_ID_PCM_MULAW,
    CODEC_ID_PCM_ALAW,
};

enum CodecType {
    CODEC_TYPE_VIDEO,
    CODEC_TYPE_AUDIO,
};

enum PixelFormat {
    PIX_FMT_YUV420P,
    PIX_FMT_YUV422,
    PIX_FMT_RGB24,
    PIX_FMT_BGR24,
    PIX_FMT_YUV422P,
    PIX_FMT_YUV444P,
};

/* currently unused, may be used if 24/32 bits samples ever supported */
enum SampleFormat {
    SAMPLE_FMT_S16 = 0,         /* signed 16 bits */
};

/* in bytes */
#define AVCODEC_MAX_AUDIO_FRAME_SIZE 18432

/* motion estimation type */
extern int motion_estimation_method;
#define ME_ZERO   0
#define ME_FULL   1
#define ME_LOG    2
#define ME_PHODS  3
#define ME_EPZS   4
#define ME_X1     5

/* encoding support */
/* note not everything is supported yet */

#define CODEC_FLAG_HQ     0x0001 /* high quality (non real time) encoding */
#define CODEC_FLAG_QSCALE 0x0002 /* use fixed qscale */
#define CODEC_FLAG_4MV    0x0004 /* 4 MV per MB allowed */
#define CODEC_FLAG_B      0x0008 /* use B frames */
#define CODEC_FLAG_QPEL   0x0010 /* use qpel MC */
#define CODEC_FLAG_GMC    0x0020 /* use GMC */

/* codec capabilities */

/* decoder can use draw_horiz_band callback */
#define CODEC_CAP_DRAW_HORIZ_BAND 0x0001

#define FRAME_RATE_BASE 10000

typedef struct AVCodecContext {
    int bit_rate;
    int bit_rate_tolerance; /* amount of +- bits (>0)*/
    int flags;
    int sub_id;    /* some codecs needs additionnal format info. It is
                      stored there */
    /* video only */
    int frame_rate; /* frames per sec multiplied by FRAME_RATE_BASE */
    int width, height;
    int aspect_ratio_info;
#define FF_ASPECT_SQUARE 1
#define FF_ASPECT_4_3_625 2
#define FF_ASPECT_4_3_525 3
#define FF_ASPECT_16_9_625 4
#define FF_ASPECT_16_9_525 5
    int gop_size; /* 0 = intra only */
    int pix_fmt;  /* pixel format, see PIX_FMT_xxx */

    /* if non NULL, 'draw_horiz_band' is called by the libavcodec
       decoder to draw an horizontal band. It improve cache usage. Not
       all codecs can do that. You must check the codec capabilities
       before */
    void (*draw_horiz_band)(struct AVCodecContext *s,
                            UINT8 **src_ptr, int linesize,
                            int y, int width, int height);

    /* audio only */
    int sample_rate; /* samples per sec */
    int channels;
    int sample_fmt;  /* sample format, currenly unused */

    /* the following data should not be initialized */
    int frame_size; /* in samples, initialized when calling 'init' */
    int frame_number; /* audio or video frame number */
    int key_frame;    /* true if the previous compressed frame was 
                         a key frame (intra, or seekable) */
    int quality;      /* quality of the previous encoded frame 
                         (between 1 (good) and 31 (bad)) */
    float qcompress;  /* amount of qscale change between easy & hard scenes (0.0-1.0)*/
    float qblur;      /* amount of qscale smoothing over time (0.0-1.0) */
    int qmin;         /* min qscale */
    int qmax;         /* max qscale */
    int max_qdiff;    /* max qscale difference between frames */
    
    int force_type;   /* 0= no force, otherwise I_TYPE, P_TYPE, ... */

    struct AVCodec *codec;
    void *priv_data;

    /* The following data is for RTP friendly coding */
    /* By now only H.263/H.263+ coder honours this   */
    int rtp_mode;   /* 1 for activate RTP friendly-mode           */
                    /* highers numbers represent more error-prone */
                    /* enviroments, by now just "1" exist         */
    
    int rtp_payload_size;   /* The size of the RTP payload, the coder will  */
                            /* do it's best to deliver a chunk with size    */
                            /* below rtp_payload_size, the chunk will start */
                            /* with a start code on some codecs like H.263  */
                            /* This doesn't take account of any particular  */
                            /* headers inside the transmited RTP payload    */

    
    /* The RTP callcack: This function is called  */
    /* every time the encoder as a packet to send */
    /* Depends on the encoder if the data starts  */
    /* with a Start Code (it should) H.263 does   */
    void (*rtp_callback)(void *data, int size, int packet_number); 

    /* These are for PSNR calculation, if you set get_psnr to 1 */
    /* after encoding you will have the PSNR on psnr_y/cb/cr    */
    int get_psnr;
    float psnr_y;
    float psnr_cb;
    float psnr_cr;
    
    /* statistics, used for 2-pass encoding */
    int mv_bits;
    int header_bits;
    int i_tex_bits;
    int p_tex_bits;
    int i_count;
    int p_count;
    int skip_count;
    int misc_bits; // cbp, mb_type
    int frame_bits;
                 
    /* the following fields are ignored */
    void *opaque;   /* can be used to carry app specific stuff */
    char codec_name[32];
    int codec_type; /* see CODEC_TYPE_xxx */
    int codec_id; /* see CODEC_ID_xxx */
    unsigned int codec_tag;  /* codec tag, only used if unknown codec */
} AVCodecContext;

typedef struct AVCodec {
    char *name;
    int type;
    int id;
    int priv_data_size;
    int (*init)(AVCodecContext *);
    int (*encode)(AVCodecContext *, UINT8 *buf, int buf_size, void *data);
    int (*close)(AVCodecContext *);
    int (*decode)(AVCodecContext *, void *outdata, int *outdata_size, 
                  UINT8 *buf, int buf_size);
    int capabilities;
    struct AVCodec *next;
} AVCodec;

/* three components are given, that's all */
typedef struct AVPicture {
    UINT8 *data[3];
    int linesize[3];
} AVPicture;

extern AVCodec ac3_encoder;
extern AVCodec mp2_encoder;
extern AVCodec mp3lame_encoder;
extern AVCodec mpeg1video_encoder;
extern AVCodec h263_encoder;
extern AVCodec h263p_encoder;
extern AVCodec rv10_encoder;
extern AVCodec mjpeg_encoder;
extern AVCodec mpeg4_encoder;
extern AVCodec msmpeg4_encoder;

extern AVCodec h263_decoder;
extern AVCodec mpeg4_decoder;
extern AVCodec msmpeg4_decoder;
extern AVCodec mpeg_decoder;
extern AVCodec h263i_decoder;
extern AVCodec rv10_decoder;
extern AVCodec mjpeg_decoder;
extern AVCodec mp3_decoder;

/* pcm codecs */
#define PCM_CODEC(id, name) \
extern AVCodec name ## _decoder; \
extern AVCodec name ## _encoder;

PCM_CODEC(CODEC_ID_PCM_S16LE, pcm_s16le);
PCM_CODEC(CODEC_ID_PCM_S16BE, pcm_s16be);
PCM_CODEC(CODEC_ID_PCM_U16LE, pcm_u16le);
PCM_CODEC(CODEC_ID_PCM_U16BE, pcm_u16be);
PCM_CODEC(CODEC_ID_PCM_S8, pcm_s8);
PCM_CODEC(CODEC_ID_PCM_U8, pcm_u8);
PCM_CODEC(CODEC_ID_PCM_ALAW, pcm_alaw);
PCM_CODEC(CODEC_ID_PCM_MULAW, pcm_mulaw);

#undef PCM_CODEC

/* dummy raw video codec */
extern AVCodec rawvideo_codec;

/* the following codecs use external GPL libs */
extern AVCodec ac3_decoder;

/* resample.c */

struct ReSampleContext;

typedef struct ReSampleContext ReSampleContext;

ReSampleContext *audio_resample_init(int output_channels, int input_channels, 
                                     int output_rate, int input_rate);
int audio_resample(ReSampleContext *s, short *output, short *input, int nb_samples);
void audio_resample_close(ReSampleContext *s);

/* YUV420 format is assumed ! */

struct ImgReSampleContext;

typedef struct ImgReSampleContext ImgReSampleContext;

ImgReSampleContext *img_resample_init(int output_width, int output_height,
                                      int input_width, int input_height);
void img_resample(ImgReSampleContext *s, 
                  AVPicture *output, AVPicture *input);

void img_resample_close(ImgReSampleContext *s);

void avpicture_fill(AVPicture *picture, UINT8 *ptr,
                    int pix_fmt, int width, int height);
int avpicture_get_size(int pix_fmt, int width, int height);

/* convert among pixel formats */
int img_convert(AVPicture *dst, int dst_pix_fmt,
                AVPicture *src, int pix_fmt, 
                int width, int height);

/* deinterlace a picture */
int avpicture_deinterlace(AVPicture *dst, AVPicture *src,
                          int pix_fmt, int width, int height);

/* external high level API */

extern AVCodec *first_avcodec;

void avcodec_init(void);

void register_avcodec(AVCodec *format);
AVCodec *avcodec_find_encoder(enum CodecID id);
AVCodec *avcodec_find_encoder_by_name(const char *name);
AVCodec *avcodec_find_decoder(enum CodecID id);
AVCodec *avcodec_find_decoder_by_name(const char *name);
void avcodec_string(char *buf, int buf_size, AVCodecContext *enc, int encode);

int avcodec_open(AVCodecContext *avctx, AVCodec *codec);
int avcodec_decode_audio(AVCodecContext *avctx, INT16 *samples, 
                         int *frame_size_ptr,
                         UINT8 *buf, int buf_size);
int avcodec_decode_video(AVCodecContext *avctx, AVPicture *picture, 
                         int *got_picture_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 AVPicture *pict);

int avcodec_close(AVCodecContext *avctx);

void avcodec_register_all(void);

#ifdef FF_POSTPROCESS
#ifndef MBC
#define MBC 48
#define MBR 36
#endif
extern int quant_store[MBR+1][MBC+1]; // [Review]
#endif

#endif /* AVCODEC_H */