avcodec.h

Trolltech公司发布的图形界面操作系统。可在qt-embedded-2.3.7平台上编译为嵌入式图形界面操作系统。

#ifndef AVCODEC_H
#define AVCODEC_H

#include "common.h"

#define LIBAVCODEC_VERSION_INT 0x000406
#define LIBAVCODEC_VERSION     "0.4.6"
#define LIBAVCODEC_BUILD       4640
#define LIBAVCODEC_BUILD_STR   "4640"

enum CodecID {
    CODEC_ID_NONE, 
    CODEC_ID_MPEG1VIDEO,
    CODEC_ID_H263,
    CODEC_ID_RV10,
    CODEC_ID_MP2,
    CODEC_ID_MP3LAME,
    CODEC_ID_VORBIS,
    CODEC_ID_AC3,
    CODEC_ID_MJPEG,
    CODEC_ID_MJPEGB,
    CODEC_ID_MPEG4,
    CODEC_ID_RAWVIDEO,
    CODEC_ID_MSMPEG4V1,
    CODEC_ID_MSMPEG4V2,
    CODEC_ID_MSMPEG4V3,
    CODEC_ID_WMV1,
    CODEC_ID_WMV2,
    CODEC_ID_H263P,
    CODEC_ID_H263I,
    CODEC_ID_SVQ1,
    CODEC_ID_DVVIDEO,
    CODEC_ID_DVAUDIO,
    CODEC_ID_WMAV1,
    CODEC_ID_WMAV2,
    CODEC_ID_MACE3,
    CODEC_ID_MACE6,
    CODEC_ID_HUFFYUV,

    /* 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,

    /* various adpcm codecs */
    CODEC_ID_ADPCM_IMA_QT,
    CODEC_ID_ADPCM_IMA_WAV,
    CODEC_ID_ADPCM_MS,
};

enum CodecType {
    CODEC_TYPE_UNKNOWN = -1,
    CODEC_TYPE_VIDEO,
    CODEC_TYPE_AUDIO,
};

enum PixelFormat {
    PIX_FMT_ANY = -1,
    PIX_FMT_YUV420P,
    PIX_FMT_YUV422,
    PIX_FMT_RGB24,
    PIX_FMT_BGR24,
    PIX_FMT_YUV422P,
    PIX_FMT_YUV444P,
    PIX_FMT_RGBA32,
    PIX_FMT_BGRA32,
    PIX_FMT_YUV410P,
    PIX_FMT_YUV411P,
    PIX_FMT_RGB565,
    PIX_FMT_RGB555,
//    PIX_FMT_RGB5551,
    PIX_FMT_BGR565,
    PIX_FMT_BGR555,
//    PIX_FMT_GBR565,
//    PIX_FMT_GBR555
};

/* 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 131072

/**
 * Required number of zero bytes at the end of the input bitstream for decoding.
 * to avoid overreading (and possibly segfaulting)
 */
#define FF_INPUT_BUFFER_PADDING_SIZE 8

/* motion estimation type, EPZS by default */
enum Motion_Est_ID {
    ME_ZERO = 1,
    ME_FULL,
    ME_LOG,
    ME_PHODS,
    ME_EPZS,
    ME_X1
};

typedef struct RcOverride{
    int start_frame;
    int end_frame;
    int qscale; // if this is 0 then quality_factor will be used instead
    float quality_factor;
} RcOverride;

/* only for ME compatiblity with old apps */
extern int motion_estimation_method;

/* ME algos sorted by quality */
static const int Motion_Est_QTab[] = { ME_ZERO, ME_PHODS, ME_LOG, 
                                       ME_X1, ME_EPZS, ME_FULL };


#define FF_MAX_B_FRAMES 4

/* encoding support
   these flags can be passed in AVCodecContext.flags before initing 
   Note: note not everything is supported yet 
*/

#define CODEC_FLAG_HQ     0x0001  /* brute force MB-type decission mode (slow) */
#define CODEC_FLAG_QSCALE 0x0002  /* use fixed qscale */
#define CODEC_FLAG_4MV    0x0004  /* 4 MV per MB allowed */
#define CODEC_FLAG_QPEL   0x0010  /* use qpel MC */
#define CODEC_FLAG_GMC    0x0020  /* use GMC */
#define CODEC_FLAG_PART   0x0080  /* use data partitioning */
/* parent program gurantees that the input for b-frame containing streams is not written to 
   for at least s->max_b_frames+1 frames, if this is not set than the input will be copied */
#define CODEC_FLAG_INPUT_PRESERVED 0x0100
#define CODEC_FLAG_PASS1 0x0200   /* use internal 2pass ratecontrol in first  pass mode */
#define CODEC_FLAG_PASS2 0x0400   /* use internal 2pass ratecontrol in second pass mode */
#define CODEC_FLAG_EXTERN_HUFF 0x1000 /* use external huffman table (for mjpeg) */
#define CODEC_FLAG_GRAY  0x2000   /* only decode/encode grayscale */
#define CODEC_FLAG_EMU_EDGE 0x4000/* dont draw edges */
#define CODEC_FLAG_DR1    0x8000  /* direct renderig type 1 (store internal frames in external buffers) */
#define CODEC_FLAG_TRUNCATED  0x00010000 /* input bitstream might be truncated at a random location instead 
                                            of only at frame boundaries */
#define CODEC_FLAG_NORMALIZE_AQP  0x00020000 /* normalize adaptive quantization */
#define CODEC_FLAG_INTERLACED_DCT 0x00040000 /* use interlaced dct */
#define CODEC_FLAG_LOW_DELAY      0x00080000 /* force low delay / will fail on b frames */
#define CODEC_FLAG_ALT_SCAN       0x00100000 /* use alternate scan */

/* codec capabilities */

#define CODEC_CAP_DRAW_HORIZ_BAND 0x0001 /* decoder can use draw_horiz_band callback */
#define CODEC_CAP_DR1             0x0002 /* direct rendering method 1 */
/* if 'parse_only' field is true, then avcodec_parse_frame() can be
   used */
#define CODEC_CAP_PARSE_ONLY      0x0004
#define CODEC_CAP_TRUNCATED       0x0008

#define FRAME_RATE_BASE 10000

typedef struct AVCodecContext {
    /**
     * the average bitrate
     * encoding: set by user. unused for constant quantizer encoding
     * decoding: set by lavc. 0 or some bitrate if this info is available in the stream 
     */
    int bit_rate;

    /**
     * number of bits the bitstream is allowed to diverge from the reference
     *           the reference can be CBR (for CBR pass1) or VBR (for pass2)
     * encoding: set by user. unused for constant quantizer encoding
     * decoding: unused
     */
    int bit_rate_tolerance; 

    /**
     * CODEC_FLAG_*
     * encoding: set by user.
     * decoding: set by user.
     */
    int flags;

    /**
     * some codecs needs additionnal format info. It is stored here
     * encoding: set by user. 
     * decoding: set by lavc. (FIXME is this ok?)
     */
    int sub_id;

    /**
     * motion estimation algorithm used for video coding
     * encoding: set by user.
     * decoding: unused
     */
    int me_method;

    /**
     * some codecs need / can use extra-data like huffman tables
     * mjpeg: huffman tables
     * rv10: additional flags
     * mpeg4: global headers (they can be in the bitstream or here)
     * encoding: set/allocated/freed by lavc.
     * decoding: set/allocated/freed by user.
     */
    void *extradata;
    int extradata_size;
    
    /* video only */
    /**
     * frames per sec multiplied by FRAME_RATE_BASE
     * for variable fps this is the precission, so if the timestamps 
     * can be specified in msec precssion then this is 1000*FRAME_RATE_BASE
     * encoding: set by user
     * decoding: set by lavc. 0 or the frame_rate if available
     */
    int frame_rate;

    /**
     * encoding: set by user.
     * decoding: set by user, some codecs might override / change it during playback
     */
    int width, height;
    
    /**
     * Obsolete, will be removed
     */
    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
#define FF_ASPECT_EXTENDED 15

    /**
     * the number of pictures in a group of pitures, or 0 for intra_only
     * encoding: set by user.
     * decoding: unused
     */
    int gop_size;

    /**
     * pixel format, see PIX_FMT_xxx
     * encoding: unused
     * decoding: set by lavc.
     */
    enum PixelFormat pix_fmt;
    
    int repeat_pict; /* when decoding, this signal how much the picture */
                     /* must be delayed.                                */
                     /* extra_delay = (repeat_pict / 2) * (1/fps)       */
    
    /**
     * 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
     * encoding: unused
     * decoding: set by user.
     */
    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 real_pict_num;  /* returns the real picture number of
                           previous encoded frame */
                           
    /**
     * 1 -> keyframe, 0-> not
     * encoding: set by lavc (for the outputed bitstream, not the input frame)
     * decoding: set by lavc (for the decoded  bitstream, not the displayed frame)
     */
    int key_frame;

    /**
     * picture type of the previous en/decoded frame, see ?_TYPE below
     * encoding: set by lavc (for the outputed bitstream, not the input frame)
     * decoding: set by lavc (for the decoded  bitstream, not the displayed frame)
     */
    int pict_type;
/* FIXME: these should have FF_ */
#define I_TYPE 1 // Intra
#define P_TYPE 2 // Predicted
#define B_TYPE 3 // Bi-dir predicted
#define S_TYPE 4 // S(GMC)-VOP MPEG4

    /**
     * number of frames the decoded output will be delayed relative to 
     * the encoded input
     * encoding: set by lavc.
     * decoding: unused
     */
    int delay;

    /**
     * mbskip_table[mb]=1 if MB didnt change, is only valid for I/P frames 
     * stride= mb_width = (width+15)>>4 (FIXME export stride?)
     * encoding: unused
     * decoding: set by lavc
     */
    uint8_t *mbskip_table;
    
    /* encoding parameters */
    /**
     * quality (between 1 (good) and 31 (bad)) 
     * encoding: set by user if CODEC_FLAG_QSCALE is set otherwise set by lavc
     * decoding: set by lavc
     */
    int quality;      /* quality of the previous encoded frame 
                         
                         this is allso used to set the quality in vbr mode
                         and the per frame quality in CODEC_FLAG_TYPE (second pass mode) */
    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) */
    
    /**
     * minimum quantizer
     * encoding: set by user.
     * decoding: unused
     */
    int qmin;

    /**
     * maximum quantizer
     * encoding: set by user.
     * decoding: unused
     */
    int qmax;

    /**
     * maximum quantizer difference etween frames
     * encoding: set by user.
     * decoding: unused
     */
    int max_qdiff;

    /**
     * maximum number of b frames between non b frames
     * note: the output will be delayed by max_b_frames+1 relative to the input
     * encoding: set by user.
     * decoding: unused
     */
    int max_b_frames;

    /**
     * qscale factor between ip and b frames
     * encoding: set by user.
     * decoding: unused
     */
    float b_quant_factor;
    
    /** obsolete FIXME remove */
    int rc_strategy;
    int b_frame_strategy;

    /**
     * encoding: unused
     * decoding: set by user. 1-> skip b frames, 2-> skip idct/dequant too, 5-> skip everything except header
     */
    int hurry_up;
    
    struct AVCodec *codec;
    
    void *priv_data;

    /* The following data is for RTP friendly coding */
    /* By now only H.263/H.263+/MPEG4 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); 

    /**
     * if you set get_psnr to 1 then after encoding you will have the 
     * PSNR on psnr_y/cb/cr
     * encoding: set by user (1-> on, 0-> off)
     * decoding: unused
     */
    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;
    
    /**
     * number of bits used for the previously encoded frame
     * encoding: set by lavc
     * decoding: - for audio - bits_per_sample
     */
    int frame_bits;
                 
    /**
     * private data of the user, can be used to carry app specific stuff
     * encoding: set by user
     * decoding: set by user
     */
    void *opaque;

    char codec_name[32];
    enum CodecType codec_type; /* see CODEC_TYPE_xxx */
    enum CodecID codec_id; /* see CODEC_ID_xxx */
    unsigned int codec_tag;  /* codec tag, only used if unknown codec */
    
    /**
     * workaround bugs in encoders which sometimes cannot be detected automatically
     * encoding: unused
     * decoding: set by user
     */
    int workaround_bugs;
#define FF_BUG_AUTODETECT       1  //autodetection
#define FF_BUG_OLD_MSMPEG4      2
#define FF_BUG_XVID_ILACE       4
#define FF_BUG_UMP4             8
#define FF_BUG_NO_PADDING       16
#define FF_BUG_AC_VLC           32
#define FF_BUG_QPEL_CHROMA      64
//#define FF_BUG_FAKE_SCALABILITY 16 //autodetection should work 100%
        
    /**
     * encoding: set by user
     * decoding: unused
     */
    int luma_elim_threshold;
    
    /**
     * encoding: set by user
     * decoding: unused
     */
    int chroma_elim_threshold;
    
    /**
     * strictly follow the std (MPEG4, ...)
     * encoding: set by user
     * decoding: unused
     */
    int strict_std_compliance;
    
    /**
     * qscale offset between ip and b frames
     * if > 0 then the last p frame quantizer will be used (q= lastp_q*factor+offset)
     * if < 0 then normal ratecontrol will be done (q= -normal_q*factor+offset)
     * encoding: set by user.
     * decoding: unused
     */
    float b_quant_offset;
    
    /**
     * error resilience {-1,0,1} higher values will detect more errors but may missdetect
     * some more or less valid parts as errors
     * encoding: unused
     * decoding: set by user
     */
    int error_resilience;
    
    /**
     * obsolete, just here to keep ABI compatible (should be removed perhaps, dunno)
     */
    int *quant_store;

    /**
     * QP store stride
     * encoding: unused
     * decoding: set by lavc
     */
    int qstride;
    
    /**
     * buffer, where the next picture should be decoded into
     * encoding: unused
     * decoding: set by user in get_buffer_callback to a buffer into which the next part
     *           of the bitstream will be decoded, and set by lavc at end of frame to the
     *           next frame which needs to be displayed
     */
    uint8_t *dr_buffer[3];
    
    /**
     * stride of the luminance part of the dr buffer
     * encoding: unused
     * decoding: set by user
     */
    int dr_stride;
    
    /**
     * same behavior as dr_buffer, just for some private data of the user
     * encoding: unused
     * decoding: set by user in get_buffer_callback, and set by lavc at end of frame
     */
    void *dr_opaque_frame;
    
    /**
     * called at the beginning of each frame to get a buffer for it
     * encoding: unused
     * decoding: set by user
     */
    int (*get_buffer_callback)(struct AVCodecContext *c, int width, int height, int pict_type);

    /**
     * is 1 if the decoded stream contains b frames, 0 otherwise
     * encoding: unused
     * decoding: set by lavc
     */