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