FFmpeg
h263dec.h
Go to the documentation of this file.
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 
38 extern VLC ff_h263_cbpy_vlc;
39 extern VLC ff_h263_mv_vlc;
40 
42 
43 int ff_h263_decode_motion(MpegEncContext * s, int pred, int f_code);
46  int *got_frame, AVPacket *avpkt);
48 void ff_h263_decode_init_vlc(void);
52 
53 /**
54  * Print picture info if FF_DEBUG_PICT_INFO is set.
55  */
57 
60  int16_t block[6][64]);
61 
63 
64 #endif
AVPixelFormat
AVPixelFormat
Pixel format.
Definition: pixfmt.h:64
ff_h263_decode_mb
int ff_h263_decode_mb(MpegEncContext *s, int16_t block[6][64])
Definition: ituh263dec.c:787
AVFrame
This structure describes decoded (raw) audio or video data.
Definition: frame.h:325
ff_h263_hwaccel_pixfmt_list_420
enum AVPixelFormat ff_h263_hwaccel_pixfmt_list_420[]
Definition: h263dec.c:695
ff_h263_decode_frame
int ff_h263_decode_frame(AVCodecContext *avctx, AVFrame *frame, int *got_frame, AVPacket *avpkt)
Definition: h263dec.c:416
mpegvideo.h
ff_h263_decode_mba
int ff_h263_decode_mba(MpegEncContext *s)
Definition: ituh263dec.c:142
ff_h263_decode_picture_header
int ff_h263_decode_picture_header(MpegEncContext *s)
Definition: ituh263dec.c:1089
ff_h263_decode_gob_header
int ff_h263_decode_gob_header(MpegEncContext *s)
ff_h263_decode_motion
int ff_h263_decode_motion(MpegEncContext *s, int pred, int f_code)
Definition: ituh263dec.c:273
s
#define s(width, name)
Definition: cbs_vp9.c:256
ff_h263_inter_MCBPC_vlc
VLC ff_h263_inter_MCBPC_vlc
Definition: ituh263dec.c:103
ff_h263_decode_init_vlc
void ff_h263_decode_init_vlc(void)
Definition: ituh263dec.c:136
ff_h263_show_pict_info
void ff_h263_show_pict_info(MpegEncContext *s)
Print picture info if FF_DEBUG_PICT_INFO is set.
Definition: ituh263dec.c:80
ff_h263_mv_vlc
VLC ff_h263_mv_vlc
Definition: ituh263dec.c:105
ff_h263_intra_MCBPC_vlc
VLC ff_h263_intra_MCBPC_vlc
Definition: ituh263dec.c:102
ff_h263_decode_end
int ff_h263_decode_end(AVCodecContext *avctx)
Definition: h263dec.c:147
ff_intel_h263_decode_picture_header
int ff_intel_h263_decode_picture_header(MpegEncContext *s)
Definition: intelh263dec.c:30
pred
static const float pred[4]
Definition: siprdata.h:259
ff_h263_decode_init
int ff_h263_decode_init(AVCodecContext *avctx)
Definition: h263dec.c:74
frame
these buffered frames must be flushed immediately if a new input produces new the filter must not call request_frame to get more It must just process the frame or queue it The task of requesting more frames is left to the filter s request_frame method or the application If a filter has several the filter must be ready for frames arriving randomly on any input any filter with several inputs will most likely require some kind of queuing mechanism It is perfectly acceptable to have a limited queue and to drop frames when the inputs are too unbalanced request_frame For filters that do not use the this method is called when a frame is wanted on an output For a it should directly call filter_frame on the corresponding output For a if there are queued frames already one of these frames should be pushed If the filter should request a frame on one of its repeatedly until at least one frame has been pushed Return or at least make progress towards producing a frame
Definition: filter_design.txt:264
AVCodecContext
main external API structure.
Definition: avcodec.h:398
VLC
Definition: vlc.h:31
ff_h263_cbpy_vlc
VLC ff_h263_cbpy_vlc
Definition: ituh263dec.c:104
AVPacket
This structure stores compressed data.
Definition: packet.h:351
vlc.h
ff_h263_resync
int ff_h263_resync(MpegEncContext *s)
Decode the group of blocks / video packet header / slice header (MPEG-4 Studio).
Definition: ituh263dec.c:216
block
The exact code depends on how similar the blocks are and how related they are to the block
Definition: filter_design.txt:207
MpegEncContext
MpegEncContext.
Definition: mpegvideo.h:70