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。

    int has_b_frames;

    /**
     * stride of the chrominance part of the dr buffer
     * encoding: unused
     * decoding: set by user
     */
    int dr_uvstride;
    
    /**
     * number of dr buffers
     * encoding: unused
     * decoding: set by user
     */
    int dr_ip_buffer_count;
    
    int block_align; /* used by some WAV based audio codecs */
    
    int parse_only; /* decoding only: if true, only parsing is done
                       (function avcodec_parse_frame()). The frame
                       data is returned. Only MPEG codecs support this now. */
    
    /**
     * 0-> h263 quant 1-> mpeg quant
     * encoding: set by user.
     * decoding: unused
     */
    int mpeg_quant;
    
    /**
     * pass1 encoding statistics output buffer
     * encoding: set by lavc
     * decoding: unused
     */
    char *stats_out; /* encoding statistics output buffer */
    
    /**
     * pass2 encoding statistics input buffer.
     * concatenated stuff from stats_out of pass1 should be placed here
     * encoding: allocated/set/freed by user
     * decoding: unused
     */
    char *stats_in;
    
    /**
     * ratecontrol qmin qmax limiting method
     * 0-> clipping, 1-> use a nice continous function to limit qscale wthin qmin/qmax
     * encoding: set by user.
     * decoding: unused
     */
    float rc_qsquish;

    float rc_qmod_amp;
    int rc_qmod_freq;
    
    /**
     * ratecontrol override, see RcOverride
     * encoding: allocated/set/freed by user.
     * decoding: unused
     */
    RcOverride *rc_override;
    int rc_override_count;
    
    /**
     * rate control equation
     * encoding: set by user
     * decoding: unused
     */
    char *rc_eq;
    
    /**
     * maximum bitrate
     * encoding: set by user.
     * decoding: unused
     */
    int rc_max_rate;
    
    /**
     * minimum bitrate
     * encoding: set by user.
     * decoding: unused
     */
    int rc_min_rate;
    
    /**
     * decoder bitstream buffer size
     * encoding: set by user.
     * decoding: unused
     */
    int rc_buffer_size;
    float rc_buffer_aggressivity;

    /**
     * qscale factor between p and i frames
     * encoding: set by user.
     * decoding: unused
     */
    float i_quant_factor;
    
    /**
     * qscale offset between p and i 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 i_quant_offset;
    
    /**
     * initial complexity for pass1 ratecontrol
     * encoding: set by user.
     * decoding: unused
     */
    float rc_initial_cplx;

    /**
     * Obsolete, will be removed
     */
    int aspected_width;
    int aspected_height;

    /**
     * dct algorithm, see FF_DCT_* below
     * encoding: set by user
     * decoding: unused
     */
    int dct_algo;
#define FF_DCT_AUTO    0
#define FF_DCT_FASTINT 1
#define FF_DCT_INT     2
#define FF_DCT_MMX     3
#define FF_DCT_MLIB    4
#define FF_DCT_ALTIVEC 5

    /**
     * presentation timestamp in micro seconds (time when frame should be shown to user)
     * if 0 then the frame_rate will be used as reference
     * encoding: set by user
     * decoding; set by lavc
     */
    long long int pts;
    
    /**
     * luminance masking (0-> disabled)
     * encoding: set by user
     * decoding: unused
     */
    float lumi_masking;
    
    /**
     * temporary complexity masking (0-> disabled)
     * encoding: set by user
     * decoding: unused
     */
    float temporal_cplx_masking;
    
    /**
     * spatial complexity masking (0-> disabled)
     * encoding: set by user
     * decoding: unused
     */
    float spatial_cplx_masking;
    
    /**
     * p block masking (0-> disabled)
     * encoding: set by user
     * decoding: unused
     */
    float p_masking;

    /**
     * darkness masking (0-> disabled)
     * encoding: set by user
     * decoding: unused
     */
    float dark_masking;
    
    /**
     * fourcc (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
     */
    int fourcc;

    /**
     * idct algorithm, see FF_IDCT_* below
     * encoding: set by user
     * decoding: set by user
     */
    int idct_algo;
#define FF_IDCT_AUTO         0
#define FF_IDCT_INT          1
#define FF_IDCT_SIMPLE       2
#define FF_IDCT_SIMPLEMMX    3
#define FF_IDCT_LIBMPEG2MMX  4
#define FF_IDCT_PS2          5
#define FF_IDCT_MLIB         6
#define FF_IDCT_ARM          7
#define FF_IDCT_ALTIVEC      8

    /**
     * slice count
     * encoding: set by lavc
     * decoding: set by user (or 0)
     */
    int slice_count;
    /**
     * slice offsets in the frame in bytes
     * encoding: set/allocated by lavc
     * decoding: set/allocated by user (or NULL)
     */
    int *slice_offset;

    /**
     * error concealment flags
     * encoding: unused
     * decoding: set by user
     */
    int error_concealment;
#define FF_EC_GUESS_MVS   1
#define FF_EC_DEBLOCK     2

    /**
     * QP table of the currently decoded frame
     * encoding; unused
     * decoding: set by lavc
     */
    int8_t *current_qscale_table;
    /**
     * QP table of the currently displayed frame
     * encoding; unused
     * decoding: set by lavc
     */
    int8_t *display_qscale_table;
    /**
     * force specific pict_type.
     * encoding; set by user (I/P/B_TYPE)
     * decoding: unused
     */
    int force_type;
    /**
     * dsp_mask could be used to disable unwanted
     * CPU features (i.e. MMX, SSE. ...)
     */
     unsigned dsp_mask;

    /**
     * bits per sample/pixel from the demuxer (needed for huffyuv)
     * encoding; set by lavc
     * decoding: set by user
     */
     int bits_per_sample;
    
    /**
     * prediction method (needed for huffyuv)
     * encoding; set by user
     * decoding: unused
     */
     int prediction_method;
#define FF_PRED_LEFT   0
#define FF_PRED_PLANE  1
#define FF_PRED_MEDIAN 2
    
    /**
     * aspect ratio. (0 if unknown)
     * encoding: set by user.
     * decoding: set by lavc.
     */
    float aspect_ratio;
} AVCodecContext;

typedef struct AVCodec {
    const 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;

/** 
 * four components are given, that's all.
 * the last component is alpha
 */
typedef struct AVPicture {
    UINT8 *data[4];
    int linesize[4];
} AVPicture;

extern AVCodec ac3_encoder;
extern AVCodec mp2_encoder;
extern AVCodec mp3lame_encoder;
extern AVCodec oggvorbis_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 msmpeg4v1_encoder;
extern AVCodec msmpeg4v2_encoder;
extern AVCodec msmpeg4v3_encoder;
extern AVCodec wmv1_encoder;
extern AVCodec wmv2_encoder;
extern AVCodec huffyuv_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 mpeg_decoder;
extern AVCodec h263i_decoder;
extern AVCodec rv10_decoder;
extern AVCodec svq1_decoder;
extern AVCodec dvvideo_decoder;
extern AVCodec dvaudio_decoder;
extern AVCodec wmav1_decoder;
extern AVCodec wmav2_decoder;
extern AVCodec mjpeg_decoder;
extern AVCodec mjpegb_decoder;
extern AVCodec mp2_decoder;
extern AVCodec mp3_decoder;
extern AVCodec mace3_decoder;
extern AVCodec mace6_decoder;
extern AVCodec huffyuv_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);

/* adpcm codecs */

PCM_CODEC(CODEC_ID_ADPCM_IMA_QT, adpcm_ima_qt);
PCM_CODEC(CODEC_ID_ADPCM_IMA_WAV, adpcm_ima_wav);
PCM_CODEC(CODEC_ID_ADPCM_MS, adpcm_ms);

#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);

ImgReSampleContext *img_resample_full_init(int owidth, int oheight,
                                      int iwidth, int iheight,
                                      int topBand, int bottomBand,
                                      int leftBand, int rightBand);

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;

/* returns LIBAVCODEC_VERSION_INT constant */
unsigned avcodec_version(void);
/* returns LIBAVCODEC_BUILD constant */
unsigned avcodec_build(void);
void avcodec_init(void);

void avcodec_set_bit_exact(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);

AVCodecContext *avcodec_alloc_context(void);
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_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 AVPicture *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))

#endif /* AVCODEC_H */