mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-23 12:43:46 +02:00
95 lines
2.8 KiB
C
95 lines
2.8 KiB
C
/* mpegencode.c */
|
|
|
|
/* Start codes. */
|
|
#define SEQ_END_CODE 0x000001b7
|
|
#define SEQ_START_CODE 0x000001b3
|
|
#define GOP_START_CODE 0x000001b8
|
|
#define PICTURE_START_CODE 0x00000100
|
|
#define SLICE_MIN_START_CODE 0x00000101
|
|
#define SLICE_MAX_START_CODE 0x000001af
|
|
#define EXT_START_CODE 0x000001b5
|
|
#define USER_START_CODE 0x000001b2
|
|
|
|
/* Macros for picture code type. */
|
|
#define I_TYPE 1
|
|
#define P_TYPE 2
|
|
#define B_TYPE 3
|
|
|
|
typedef int DCTELEM;
|
|
|
|
enum OutputFormat {
|
|
FMT_MPEG1,
|
|
FMT_H263,
|
|
FMT_MJPEG,
|
|
};
|
|
|
|
#define MAX_NEG_CROP 384
|
|
|
|
#define MPEG_BUF_SIZE (16 * 1024)
|
|
|
|
typedef struct MpegEncContext {
|
|
/* the following parameters must be initialized before encoding */
|
|
int width, height; /* picture size. must be a multiple of 16 */
|
|
int gop_size;
|
|
int frame_rate; /* number of frames per second */
|
|
int intra_only; /* if true, only intra pictures are generated */
|
|
int bit_rate; /* wanted bit rate */
|
|
enum OutputFormat out_format; /* output format */
|
|
int h263_rv10; /* use RV10 variation for H263 */
|
|
|
|
/* the following fields are managed internally by the encoder */
|
|
|
|
/* bit output */
|
|
PutBitContext pb;
|
|
|
|
/* sequence parameters */
|
|
int picture_number;
|
|
int fake_picture_number; /* picture number at the bitstream frame rate */
|
|
int gop_picture_number; /* index of the first picture of a GOP */
|
|
int mb_width, mb_height;
|
|
UINT8 *new_picture[3]; /* picture to be compressed */
|
|
UINT8 *last_picture[3]; /* previous picture */
|
|
UINT8 *current_picture[3]; /* buffer to store the decompressed current picture */
|
|
int last_dc[3];
|
|
int qscale;
|
|
int pict_type;
|
|
int frame_rate_index;
|
|
/* macroblock layer */
|
|
int mb_incr;
|
|
int mb_intra;
|
|
/* matrix transmitted in the bitstream */
|
|
UINT8 init_intra_matrix[64];
|
|
/* precomputed matrix (combine qscale and DCT renorm) */
|
|
int intra_matrix[64];
|
|
int non_intra_matrix[64];
|
|
int block_last_index[6]; /* last non zero coefficient in block */
|
|
|
|
void *opaque; /* private data for the user */
|
|
|
|
/* bit rate control */
|
|
int I_frame_bits; /* wanted number of bits per I frame */
|
|
int P_frame_bits; /* same for P frame */
|
|
long long wanted_bits;
|
|
long long total_bits;
|
|
struct MJpegContext *mjpeg_ctx;
|
|
} MpegEncContext;
|
|
|
|
extern const UINT8 zigzag_direct[64];
|
|
|
|
/* h263enc.c */
|
|
|
|
void h263_encode_mb(MpegEncContext *s,
|
|
DCTELEM block[6][64],
|
|
int motion_x, int motion_y);
|
|
void h263_picture_header(MpegEncContext *s, int picture_number);
|
|
void rv10_encode_picture_header(MpegEncContext *s, int picture_number);
|
|
|
|
/* mjpegenc.c */
|
|
|
|
int mjpeg_init(MpegEncContext *s);
|
|
void mjpeg_close(MpegEncContext *s);
|
|
void mjpeg_encode_mb(MpegEncContext *s,
|
|
DCTELEM block[6][64]);
|
|
void mjpeg_picture_header(MpegEncContext *s);
|
|
void mjpeg_picture_trailer(MpegEncContext *s);
|