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1 /*
2  * H.263 decoder internal header
3  *
4  * This file is part of FFmpeg.
5  *
6  * FFmpeg is free software; you can redistribute it and/or
7  * modify it under the terms of the GNU Lesser General Public
8  * License as published by the Free Software Foundation; either
9  * version 2.1 of the License, or (at your option) any later version.
10  *
11  * FFmpeg is distributed in the hope that it will be useful,
12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
14  * Lesser General Public License for more details.
15  *
16  * You should have received a copy of the GNU Lesser General Public
17  * License along with FFmpeg; if not, write to the Free Software
18  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19  */
20 #ifndef AVCODEC_H263DEC_H
21 #define AVCODEC_H263DEC_H
22 
23 #include "mpegvideo.h"
24 #include "vlc.h"
25 
26 // The defines below define the number of bits that are read at once for
27 // reading vlc values. Changing these may improve speed and data cache needs
28 // be aware though that decreasing them may need the number of stages that is
29 // passed to get_vlc* to be increased.
30 #define H263_MV_VLC_BITS     9
31 #define INTRA_MCBPC_VLC_BITS 6
32 #define INTER_MCBPC_VLC_BITS 7
33 #define CBPY_VLC_BITS 6
34 #define TEX_VLC_BITS 9
35 
36 extern VLC ff_h263_intra_MCBPC_vlc;
37 extern VLC ff_h263_inter_MCBPC_vlc;
38 extern VLC ff_h263_cbpy_vlc;
39 extern VLC ff_h263_mv_vlc;
40 
41 extern const enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[];
42 
43 int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code);
44 int ff_h263_decode_init(AVCodecContext *avctx);
45 int ff_h263_decode_frame(AVCodecContext *avctx, AVFrame *frame,
46                          int *got_frame, AVPacket *avpkt);
47 int ff_h263_decode_end(AVCodecContext *avctx);
48 void ff_h263_decode_init_vlc(void);
49 int ff_h263_decode_picture_header(MpegEncContext *s);
50 int ff_h263_decode_gob_header(MpegEncContext *s);
51 int ff_h263_decode_mba(MpegEncContext *s);
52 
53 /**
54  * Print picture info if FF_DEBUG_PICT_INFO is set.
55  */
56 void ff_h263_show_pict_info(MpegEncContext *s);
57 
58 int ff_intel_h263_decode_picture_header(MpegEncContext *s);
59 int ff_h263_decode_mb(MpegEncContext *s,
60                       int16_t block[6][64]);
61 
62 int ff_h263_resync(MpegEncContext *s);
63 
64 #endif
65