avcodec.h

wince 平台下的h264 压缩代码程序

     * @param fmt is the list of formats which are supported by the codec,
     * its terminated by -1 as 0 is a valid format, the formats are ordered by quality
     * the first is allways the native one
     * @return the choosen format
     * - encoding: unused
     * - decoding: set by user, if not set then the native format will always be choosen
     */
    enum PixelFormat (*get_format)(struct AVCodecContext *s, const enum PixelFormat * fmt);

    /**
     * DTG active format information (additionnal aspect ratio
     * information only used in DVB MPEG2 transport streams). 0 if
     * not set.
     * 
     * - encoding: unused.
     * - decoding: set by decoder 
     */
    int dtg_active_format;
#define FF_DTG_AFD_SAME         8
#define FF_DTG_AFD_4_3          9
#define FF_DTG_AFD_16_9         10
#define FF_DTG_AFD_14_9         11
#define FF_DTG_AFD_4_3_SP_14_9  13
#define FF_DTG_AFD_16_9_SP_14_9 14
#define FF_DTG_AFD_SP_4_3       15

    /**
     * Maximum motion estimation search range in subpel units.
     * if 0 then no limit
     * 
     * - encoding: set by user.
     * - decoding: unused.
     */
    int me_range;

    /**
     * frame_rate_base.
     * for variable fps this is 1
     * - encoding: set by user.
     * - decoding: set by lavc.
     * @todo move this after frame_rate
     */

    int frame_rate_base;
    /**
     * intra quantizer bias.
     * - encoding: set by user.
     * - decoding: unused
     */
    int intra_quant_bias;
#define FF_DEFAULT_QUANT_BIAS 999999
    
    /**
     * inter quantizer bias.
     * - encoding: set by user.
     * - decoding: unused
     */
    int inter_quant_bias;

    /**
     * color table ID.
     * - encoding: unused.
     * - decoding: which clrtable should be used for 8bit RGB images
     *             table have to be stored somewhere FIXME
     */
    int color_table_id;
    
    /**
     * internal_buffer count. 
     * Dont touch, used by lavc default_get_buffer()
     */
    int internal_buffer_count;
    
    /**
     * internal_buffers. 
     * Dont touch, used by lavc default_get_buffer()
     */
    void *internal_buffer;

#define FF_LAMBDA_SHIFT 7
#define FF_LAMBDA_SCALE (1<<FF_LAMBDA_SHIFT)
#define FF_QP2LAMBDA 118 ///< factor to convert from H.263 QP to lambda
#define FF_LAMBDA_MAX (256*128-1)

#define FF_QUALITY_SCALE FF_LAMBDA_SCALE //FIXME maybe remove
    /**
     * global quality for codecs which cannot change it per frame.
     * this should be proportional to MPEG1/2/4 qscale.
     * - encoding: set by user.
     * - decoding: unused
     */
    int global_quality;
    
#define FF_CODER_TYPE_VLC   0
#define FF_CODER_TYPE_AC    1
    /**
     * coder type
     * - encoding: set by user.
     * - decoding: unused
     */
    int coder_type;

    /**
     * context model
     * - encoding: set by user.
     * - decoding: unused
     */
    int context_model;
    
    /**
     * slice flags
     * - encoding: unused
     * - decoding: set by user.
     */
    int slice_flags;
#define SLICE_FLAG_CODED_ORDER    0x0001 ///< draw_horiz_band() is called in coded order instead of display
#define SLICE_FLAG_ALLOW_FIELD    0x0002 ///< allow draw_horiz_band() with field slices (MPEG2 field pics)
#define SLICE_FLAG_ALLOW_PLANE    0x0004 ///< allow draw_horiz_band() with 1 component at a time (SVQ1)

    /**
     * XVideo Motion Acceleration
     * - encoding: forbidden
     * - decoding: set by decoder
     */
    int xvmc_acceleration;
    
    /**
     * macroblock decision mode
     * - encoding: set by user.
     * - decoding: unused
     */
    int mb_decision;
#define FF_MB_DECISION_SIMPLE 0        ///< uses mb_cmp
#define FF_MB_DECISION_BITS   1        ///< chooses the one which needs the fewest bits
#define FF_MB_DECISION_RD     2        ///< rate distoration

    /**
     * custom intra quantization matrix
     * - encoding: set by user, can be NULL
     * - decoding: set by lavc
     */
    uint16_t *intra_matrix;

    /**
     * custom inter quantization matrix
     * - encoding: set by user, can be NULL
     * - decoding: set by lavc
     */
    uint16_t *inter_matrix;
    
    /**
     * fourcc from the AVI stream header (LSB first, so "ABCD" -> ('D'<<24) + ('C'<<16) + ('B'<<8) + 'A').
     * this is used to workaround some encoder bugs
     * - encoding: unused
     * - decoding: set by user, will be converted to upper case by lavc during init
     */
    unsigned int stream_codec_tag;

    /**
     * scene change detection threshold.
     * 0 is default, larger means fewer detected scene changes
     * - encoding: set by user.
     * - decoding: unused
     */
    int scenechange_threshold;

    /**
     * minimum lagrange multipler
     * - encoding: set by user.
     * - decoding: unused
     */
    int lmin;

    /**
     * maximum lagrange multipler
     * - encoding: set by user.
     * - decoding: unused
     */
    int lmax;

    /**
     * Palette control structure
     * - encoding: ??? (no palette-enabled encoder yet)
     * - decoding: set by user.
     */
    struct AVPaletteControl *palctrl;

    /**
     * noise reduction strength
     * - encoding: set by user.
     * - decoding: unused
     */
    int noise_reduction;
    
    /**
     * called at the beginning of a frame to get cr buffer for it.
     * buffer type (size, hints) must be the same. lavc won't check it.
     * lavc will pass previous buffer in pic, function should return
     * same buffer or new buffer with old frame "painted" into it.
     * if pic.data[0] == NULL must behave like get_buffer().
     * - encoding: unused
     * - decoding: set by lavc, user can override
     */
    int (*reget_buffer)(struct AVCodecContext *c, AVFrame *pic);

    /**
     * number of bits which should be loaded into the rc buffer before decoding starts
     * - encoding: set by user.
     * - decoding: unused
     */
    int rc_initial_buffer_occupancy;

    /**
     *
     * - encoding: set by user.
     * - decoding: unused
     */
    int inter_threshold;

    /**
     * CODEC_FLAG2_*.
     * - encoding: set by user.
     * - decoding: set by user.
     */
    int flags2;

    /**
     * simulates errors in the bitstream to test error concealment.
     * - encoding: set by user.
     * - decoding: unused.
     */
    int error_rate;
    
    /**
     * MP3 antialias algorithm, see FF_AA_* below.
     * - encoding: unused
     * - decoding: set by user
     */
    int antialias_algo;
#define FF_AA_AUTO    0
#define FF_AA_FASTINT 1 //not implemented yet
#define FF_AA_INT     2
#define FF_AA_FLOAT   3
    /**
     * Quantizer noise shaping.
     * - encoding: set by user
     * - decoding: unused
     */
    int quantizer_noise_shaping;

    /**
     * Thread count.
     * is used to decide how many independant tasks should be passed to execute()
     * - encoding: set by user
     * - decoding: set by user
     */
    int thread_count;
    
    /**
     * the codec may call this to execute several independant things. it will return only after
     * finishing all tasks, the user may replace this with some multithreaded implementation, the
     * default implementation will execute the parts serially
     * @param count the number of things to execute
     * - encoding: set by lavc, user can override
     * - decoding: set by lavc, user can override
     */
    int (*execute)(struct AVCodecContext *c, int (*func)(struct AVCodecContext *c2, void *arg), void **arg2, int *ret, int count);
    
    /**
     * Thread opaque.
     * can be used by execute() to store some per AVCodecContext stuff.
     * - encoding: set by execute()
     * - decoding: set by execute()
     */
    void *thread_opaque;
} AVCodecContext;


/**
 * AVOption.
 */
typedef struct AVOption {
    /** options' name */
    const char *name; /* if name is NULL, it indicates a link to next */
    /** short English text help or const struct AVOption* subpointer */
    const char *help; //	const struct AVOption* sub;
    /** offset to context structure where the parsed value should be stored */
    int offset;
    /** options' type */
    int type;
#define FF_OPT_TYPE_BOOL 1      ///< boolean - true,1,on  (or simply presence)
#define FF_OPT_TYPE_DOUBLE 2    ///< double
#define FF_OPT_TYPE_INT 3       ///< integer
#define FF_OPT_TYPE_STRING 4    ///< string (finished with \0)
#define FF_OPT_TYPE_MASK 0x1f	///< mask for types - upper bits are various flags
//#define FF_OPT_TYPE_EXPERT 0x20 // flag for expert option
#define FF_OPT_TYPE_FLAG (FF_OPT_TYPE_BOOL | 0x40)
#define FF_OPT_TYPE_RCOVERRIDE (FF_OPT_TYPE_STRING | 0x80)
    /** min value  (min == max   ->  no limits) */
    double min;
    /** maximum value for double/int */
    double max;
    /** default boo [0,1]l/double/int value */
    double defval;
    /**
     * default string value (with optional semicolon delimited extra option-list
     * i.e.   option1;option2;option3
     * defval might select other then first argument as default
     */
    const char *defstr;
#define FF_OPT_MAX_DEPTH 10
} AVOption;

/**
 * Parse option(s) and sets fields in passed structure
 * @param strct	structure where the parsed results will be written
 * @param list  list with AVOptions
 * @param opts	string with options for parsing
 */
int avoption_parse(void* strct, const AVOption* list, const char* opts);


/**
 * AVCodec.
 */
typedef struct AVCodec {
    const char *name;
    enum CodecType type;
    int id;
    int priv_data_size;
    int (*init)(AVCodecContext *);
    int (*encode)(AVCodecContext *, uint8_t *buf, int buf_size, void *data);
    int (*close)(AVCodecContext *);
    int (*decode)(AVCodecContext *, void *outdata, int *outdata_size,
                  uint8_t *buf, int buf_size);
    int capabilities;
    const AVOption *options;
    struct AVCodec *next;
    void (*flush)(AVCodecContext *);
    const AVRational *supported_framerates; ///array of supported framerates, or NULL if any, array is terminated by {0,0}
} AVCodec;

/**
 * four components are given, that's all.
 * the last component is alpha
 */
typedef struct AVPicture {
    uint8_t *data[4];
    int linesize[4];       ///< number of bytes per line
} AVPicture;

/**
 * AVPaletteControl
 * This structure defines a method for communicating palette changes
 * between and demuxer and a decoder.
 */
#define AVPALETTE_SIZE 1024
#define AVPALETTE_COUNT 256
typedef struct AVPaletteControl {

    /* demuxer sets this to 1 to indicate the palette has changed;
     * decoder resets to 0 */
    int palette_changed;

    /* 4-byte ARGB palette entries, stored in native byte order; note that
     * the individual palette components should be on a 8-bit scale; if
     * the palette data comes from a IBM VGA native format, the component
     * data is probably 6 bits in size and needs to be scaled */
    unsigned int palette[AVPALETTE_COUNT];

} AVPaletteControl;

extern AVCodec ac3_encoder;
extern AVCodec mp2_encoder;
extern AVCodec mp3lame_encoder;
extern AVCodec oggvorbis_encoder;
extern AVCodec faac_encoder;
extern AVCodec mpeg1video_encoder;
extern AVCodec mpeg2video_encoder;
extern AVCodec h263_encoder;
extern AVCodec h263p_encoder;
extern AVCodec flv_encoder;
extern AVCodec rv10_encoder;
extern AVCodec rv20_encoder;
extern AVCodec dvvideo_encoder;
extern AVCodec mjpeg_encoder;
extern AVCodec ljpeg_encoder;
extern AVCodec mpeg4_encoder;
extern AVCodec msmpeg4v1_encoder;
extern AVCodec msmpeg4v2_encoder;
extern AVCodec msmpeg4v3_encoder;
extern AVCodec wmv1_encoder;
extern AVCodec wmv2_encoder;
extern AVCodec huffyuv_encoder;
extern AVCodec h264_encoder;
extern AVCodec asv1_encoder;
extern AVCodec asv2_encoder;
extern AVCodec vcr1_encoder;
extern AVCodec ffv1_encoder;
extern AVCodec mdec_encoder;
extern AVCodec zlib_encoder;

extern AVCodec h263_decoder;
extern AVCodec mpeg4_decoder;
extern AVCodec msmpeg4v1_decoder;
extern AVCodec msmpeg4v2_decoder;
extern AVCodec msmpeg4v3_decoder;
extern AVCodec wmv1_decoder;
extern AVCodec wmv2_decoder;
extern AVCodec mpeg1video_decoder;
extern AVCodec mpeg2video_decoder;
extern AVCodec mpegvideo_decoder;
extern AVCodec mpeg_xvmc_decoder;
extern AVCodec h263i_decoder;
extern AVCodec flv_decoder;
extern AVCodec rv10_decoder;
extern AVCodec rv20_decoder;
extern AVCodec svq1_decoder;
extern AVCodec svq3_decoder;
extern AVCodec dvvideo_decoder;
extern AVCodec wmav1_decoder;
extern AVCodec wmav2_decoder;
extern AVCodec mjpeg_decoder;
extern AVCodec mjpegb_decoder;
extern AVCodec sp5x_decoder;
extern AVCodec mp2_decoder;
extern AVCodec mp3_decoder;
extern AVCodec mace3_decoder;
extern AVCodec mace6_decoder;
extern AVCodec huffyuv_decoder;