/* * H.263 internal header * * This file is part of FFmpeg. * * FFmpeg is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2.1 of the License, or (at your option) any later version. * * FFmpeg is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General Public * License along with FFmpeg; if not, write to the Free Software * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ #ifndef AVCODEC_H263_H #define AVCODEC_H263_H #include #include "libavutil/rational.h" #include "get_bits.h" #include "mpegvideo.h" #include "h263data.h" #include "rl.h" #define FF_ASPECT_EXTENDED 15 #define INT_BIT (CHAR_BIT * sizeof(int)) // The defines below define the number of bits that are read at once for // reading vlc values. Changing these may improve speed and data cache needs // be aware though that decreasing them may need the number of stages that is // passed to get_vlc* to be increased. #define H263_MV_VLC_BITS 9 #define INTRA_MCBPC_VLC_BITS 6 #define INTER_MCBPC_VLC_BITS 7 #define CBPY_VLC_BITS 6 #define TEX_VLC_BITS 9 #define H263_GOB_HEIGHT(h) ((h) <= 400 ? 1 : (h) <= 800 ? 2 : 4) extern VLC ff_h263_intra_MCBPC_vlc; extern VLC ff_h263_inter_MCBPC_vlc; extern VLC ff_h263_cbpy_vlc; extern VLC ff_h263_mv_vlc; extern const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[]; int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code); av_const int ff_h263_aspect_to_info(AVRational aspect); int ff_h263_decode_init(AVCodecContext *avctx); int ff_h263_decode_frame(AVCodecContext *avctx, void *data, int *got_frame, AVPacket *avpkt); int ff_h263_decode_end(AVCodecContext *avctx); void ff_h263_encode_mb(MpegEncContext *s, int16_t block[6][64], int motion_x, int motion_y); void ff_h263_encode_picture_header(MpegEncContext *s, int picture_number); void ff_h263_encode_gob_header(MpegEncContext * s, int mb_line); int16_t *ff_h263_pred_motion(MpegEncContext * s, int block, int dir, int *px, int *py); void ff_h263_encode_init(MpegEncContext *s); void ff_h263_decode_init_vlc(void); void ff_h263_init_rl_inter(void); int ff_h263_decode_picture_header(MpegEncContext *s); int ff_h263_decode_gob_header(MpegEncContext *s); void ff_h263_update_motion_val(MpegEncContext * s); void ff_h263_loop_filter(MpegEncContext * s); int ff_h263_decode_mba(MpegEncContext *s); void ff_h263_encode_mba(MpegEncContext *s); void ff_init_qscale_tab(MpegEncContext *s); int ff_h263_pred_dc(MpegEncContext * s, int n, int16_t **dc_val_ptr); void ff_h263_pred_acdc(MpegEncContext * s, int16_t *block, int n); /** * Print picture info if FF_DEBUG_PICT_INFO is set. */ void ff_h263_show_pict_info(MpegEncContext *s); int ff_intel_h263_decode_picture_header(MpegEncContext *s); int ff_h263_decode_mb(MpegEncContext *s, int16_t block[6][64]); /** * Return the value of the 3-bit "source format" syntax element. * This represents some standard picture dimensions or indicates that * width&height are explicitly stored later. */ int av_const h263_get_picture_format(int width, int height); void ff_clean_h263_qscales(MpegEncContext *s); int ff_h263_resync(MpegEncContext *s); void ff_h263_encode_motion(PutBitContext *pb, int val, int f_code); static inline int h263_get_motion_length(int val, int f_code){ int bit_size, code, sign; if (val == 0) { return ff_mvtab[0][1]; } else { bit_size = f_code - 1; /* modulo encoding */ val = sign_extend(val, 6 + bit_size); sign = val >> 31; val = (val ^ sign) - sign; /* val = FFABS(val) */ val--; code = (val >> bit_size) + 1; return ff_mvtab[code][1] + 1 + bit_size; } } static inline void ff_h263_encode_motion_vector(MpegEncContext * s, int x, int y, int f_code){ if (s->avctx->flags2 & AV_CODEC_FLAG2_NO_OUTPUT) { skip_put_bits(&s->pb, h263_get_motion_length(x, f_code) +h263_get_motion_length(y, f_code)); }else{ ff_h263_encode_motion(&s->pb, x, f_code); ff_h263_encode_motion(&s->pb, y, f_code); } } static inline int get_p_cbp(MpegEncContext * s, int16_t block[6][64], int motion_x, int motion_y){ int cbp, i; if (s->mpv_flags & FF_MPV_FLAG_CBP_RD) { int best_cbpy_score= INT_MAX; int best_cbpc_score= INT_MAX; int cbpc = (-1), cbpy= (-1); const int offset= (s->mv_type==MV_TYPE_16X16 ? 0 : 16) + (s->dquant ? 8 : 0); const int lambda= s->lambda2 >> (FF_LAMBDA_SHIFT - 6); for(i=0; i<4; i++){ int score= ff_h263_inter_MCBPC_bits[i + offset] * lambda; if(i&1) score += s->coded_score[5]; if(i&2) score += s->coded_score[4]; if(score < best_cbpc_score){ best_cbpc_score= score; cbpc= i; } } for(i=0; i<16; i++){ int score= ff_h263_cbpy_tab[i ^ 0xF][1] * lambda; if(i&1) score += s->coded_score[3]; if(i&2) score += s->coded_score[2]; if(i&4) score += s->coded_score[1]; if(i&8) score += s->coded_score[0]; if(score < best_cbpy_score){ best_cbpy_score= score; cbpy= i; } } cbp= cbpc + 4*cbpy; if ((motion_x | motion_y | s->dquant) == 0 && s->mv_type==MV_TYPE_16X16){ if(best_cbpy_score + best_cbpc_score + 2*lambda >= 0) cbp= 0; } for (i = 0; i < 6; i++) { if (s->block_last_index[i] >= 0 && ((cbp >> (5 - i))&1)==0 ){ s->block_last_index[i]= -1; s->bdsp.clear_block(s->block[i]); } } }else{ cbp= 0; for (i = 0; i < 6; i++) { if (s->block_last_index[i] >= 0) cbp |= 1 << (5 - i); } } return cbp; } #endif /* AVCODEC_H263_H */