FFmpeg  2.1.1
wmv2enc.c
Go to the documentation of this file.
1 /*
2  * Copyright (c) 2002 The FFmpeg Project
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 
21 #include "avcodec.h"
22 #include "mpegvideo.h"
23 #include "msmpeg4.h"
24 #include "msmpeg4data.h"
25 #include "h263.h"
26 #include "wmv2.h"
27 
28 
30  MpegEncContext * const s= &w->s;
31  PutBitContext pb;
32  int code;
33 
35 
36  put_bits(&pb, 5, s->avctx->time_base.den / s->avctx->time_base.num); //yes 29.97 -> 29
37  put_bits(&pb, 11, FFMIN(s->bit_rate/1024, 2047));
38 
39  put_bits(&pb, 1, w->mspel_bit=1);
40  put_bits(&pb, 1, s->loop_filter);
41  put_bits(&pb, 1, w->abt_flag=1);
42  put_bits(&pb, 1, w->j_type_bit=1);
43  put_bits(&pb, 1, w->top_left_mv_flag=0);
44  put_bits(&pb, 1, w->per_mb_rl_bit=1);
45  put_bits(&pb, 3, code=1);
46 
47  flush_put_bits(&pb);
48 
49  s->slice_height = s->mb_height / code;
50 
51  return 0;
52 }
53 
55  Wmv2Context * const w= avctx->priv_data;
56 
57  if(ff_MPV_encode_init(avctx) < 0)
58  return -1;
59 
61 
62  avctx->extradata_size= 4;
63  avctx->extradata= av_mallocz(avctx->extradata_size + 10);
65 
66  return 0;
67 }
68 
70 {
71  Wmv2Context * const w= (Wmv2Context*)s;
72 
73  put_bits(&s->pb, 1, s->pict_type - 1);
74  if(s->pict_type == AV_PICTURE_TYPE_I){
75  put_bits(&s->pb, 7, 0);
76  }
77  put_bits(&s->pb, 5, s->qscale);
78 
79  s->dc_table_index = 1;
80  s->mv_table_index = 1; /* only if P frame */
81  s->per_mb_rl_table = 0;
82  s->mspel= 0;
83  w->per_mb_abt=0;
84  w->abt_type=0;
85  w->j_type=0;
86 
88 
89  if (s->pict_type == AV_PICTURE_TYPE_I) {
90  av_assert0(s->no_rounding==1);
91  if(w->j_type_bit) put_bits(&s->pb, 1, w->j_type);
92 
93  if(w->per_mb_rl_bit) put_bits(&s->pb, 1, s->per_mb_rl_table);
94 
95  if(!s->per_mb_rl_table){
98  }
99 
100  put_bits(&s->pb, 1, s->dc_table_index);
101 
102  s->inter_intra_pred= 0;
103  }else{
104  int cbp_index;
105 
106  put_bits(&s->pb, 2, SKIP_TYPE_NONE);
107 
108  ff_msmpeg4_code012(&s->pb, cbp_index=0);
109  if(s->qscale <= 10){
110  int map[3]= {0,2,1};
111  w->cbp_table_index= map[cbp_index];
112  }else if(s->qscale <= 20){
113  int map[3]= {1,0,2};
114  w->cbp_table_index= map[cbp_index];
115  }else{
116  int map[3]= {2,1,0};
117  w->cbp_table_index= map[cbp_index];
118  }
119 
120  if(w->mspel_bit) put_bits(&s->pb, 1, s->mspel);
121 
122  if(w->abt_flag){
123  put_bits(&s->pb, 1, w->per_mb_abt^1);
124  if(!w->per_mb_abt){
125  ff_msmpeg4_code012(&s->pb, w->abt_type);
126  }
127  }
128 
129  if(w->per_mb_rl_bit) put_bits(&s->pb, 1, s->per_mb_rl_table);
130 
131  if(!s->per_mb_rl_table){
134  }
135  put_bits(&s->pb, 1, s->dc_table_index);
136  put_bits(&s->pb, 1, s->mv_table_index);
137 
138  s->inter_intra_pred= 0;//(s->width*s->height < 320*240 && s->bit_rate<=II_BITRATE);
139  }
140  s->esc3_level_length= 0;
141  s->esc3_run_length= 0;
142 
143  return 0;
144 }
145 
146 /* Nearly identical to wmv1 but that is just because we do not use the
147  * useless M$ crap features. It is duplicated here in case someone wants
148  * to add support for these crap features. */
150  int16_t block[6][64],
151  int motion_x, int motion_y)
152 {
153  Wmv2Context * const w= (Wmv2Context*)s;
154  int cbp, coded_cbp, i;
155  int pred_x, pred_y;
156  uint8_t *coded_block;
157 
159 
160  if (!s->mb_intra) {
161  /* compute cbp */
162  cbp = 0;
163  for (i = 0; i < 6; i++) {
164  if (s->block_last_index[i] >= 0)
165  cbp |= 1 << (5 - i);
166  }
167 
168  put_bits(&s->pb,
169  ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][1],
170  ff_wmv2_inter_table[w->cbp_table_index][cbp + 64][0]);
171 
172  /* motion vector */
173  ff_h263_pred_motion(s, 0, 0, &pred_x, &pred_y);
174  ff_msmpeg4_encode_motion(s, motion_x - pred_x,
175  motion_y - pred_y);
176  } else {
177  /* compute cbp */
178  cbp = 0;
179  coded_cbp = 0;
180  for (i = 0; i < 6; i++) {
181  int val, pred;
182  val = (s->block_last_index[i] >= 1);
183  cbp |= val << (5 - i);
184  if (i < 4) {
185  /* predict value for close blocks only for luma */
186  pred = ff_msmpeg4_coded_block_pred(s, i, &coded_block);
187  *coded_block = val;
188  val = val ^ pred;
189  }
190  coded_cbp |= val << (5 - i);
191  }
192 
193  if (s->pict_type == AV_PICTURE_TYPE_I) {
194  put_bits(&s->pb,
195  ff_msmp4_mb_i_table[coded_cbp][1], ff_msmp4_mb_i_table[coded_cbp][0]);
196  } else {
197  put_bits(&s->pb,
200  }
201  put_bits(&s->pb, 1, 0); /* no AC prediction yet */
202  if(s->inter_intra_pred){
203  s->h263_aic_dir=0;
205  }
206  }
207 
208  for (i = 0; i < 6; i++) {
209  ff_msmpeg4_encode_block(s, block[i], i);
210  }
211 }
212 
214  .name = "wmv2",
215  .long_name = NULL_IF_CONFIG_SMALL("Windows Media Video 8"),
216  .type = AVMEDIA_TYPE_VIDEO,
217  .id = AV_CODEC_ID_WMV2,
218  .priv_data_size = sizeof(Wmv2Context),
220  .encode2 = ff_MPV_encode_picture,
222  .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE },
223 };
int inter_intra_pred
Definition: mpegvideo.h:650
int j_type_bit
Definition: wmv2.h:39
const char const char void * val
Definition: avisynth_c.h:671
const char * s
Definition: avisynth_c.h:668
int esc3_level_length
Definition: mpegvideo.h:646
static void put_bits(Jpeg2000EncoderContext *s, int val, int n)
put n times val bit
Definition: j2kenc.c:160
static int encode_ext_header(Wmv2Context *w)
Definition: wmv2enc.c:29
static av_cold int init(AVCodecContext *avctx)
Definition: avrndec.c:35
int ff_MPV_encode_end(AVCodecContext *avctx)
int per_mb_abt
Definition: wmv2.h:44
int num
numerator
Definition: rational.h:44
mpegvideo header.
int per_mb_rl_bit
Definition: wmv2.h:49
Pixel format.
Definition: avcodec.h:4533
AVCodec.
Definition: avcodec.h:2922
#define av_cold
Definition: avcodec.h:653
int qscale
QP.
Definition: mpegvideo.h:373
int16_t * ff_h263_pred_motion(MpegEncContext *s, int block, int dir, int *px, int *py)
Definition: h263.c:312
uint8_t * extradata
some codecs need / can use extradata like Huffman tables.
Definition: avcodec.h:1254
AVRational time_base
This is the fundamental unit of time (in seconds) in terms of which frame timestamps are represented...
Definition: avcodec.h:1265
AVCodec ff_wmv2_encoder
Definition: wmv2enc.c:213
int esc3_run_length
Definition: mpegvideo.h:647
uint8_t
static av_cold int wmv2_encode_init(AVCodecContext *avctx)
Definition: wmv2enc.c:54
const char * name
Name of the codec implementation.
Definition: avcodec.h:2929
int no_rounding
apply no rounding to motion compensation (MPEG4, msmpeg4, ...) for b-frames rounding mode is always 0...
Definition: mpegvideo.h:443
MSMPEG4 data tables.
int mb_height
number of MBs horizontally &amp; vertically
Definition: mpegvideo.h:281
MpegEncContext s
Definition: wmv2.h:36
int flipflop_rounding
Definition: mpegvideo.h:643
int ff_MPV_encode_init(AVCodecContext *avctx)
const uint16_t ff_msmp4_mb_i_table[64][2]
Definition: msmpeg4data.c:43
int ff_wmv2_encode_picture_header(MpegEncContext *s, int picture_number)
Definition: wmv2enc.c:69
int rl_chroma_table_index
Definition: mpegvideo.h:638
#define NULL_IF_CONFIG_SMALL(x)
Return NULL if CONFIG_SMALL is true, otherwise the argument without modification. ...
Definition: internal.h:151
int per_mb_rl_table
Definition: mpegvideo.h:645
Libavcodec external API header.
AVPixelFormat
Pixel format.
Definition: pixfmt.h:66
int abt_type
Definition: wmv2.h:42
#define FFMIN(a, b)
Definition: avcodec.h:925
void ff_wmv2_encode_mb(MpegEncContext *s, int16_t block[6][64], int motion_x, int motion_y)
Definition: wmv2enc.c:149
int block_last_index[12]
last non zero coefficient in block
Definition: mpegvideo.h:295
void ff_msmpeg4_encode_motion(MpegEncContext *s, int mx, int my)
Definition: msmpeg4enc.c:287
static const float pred[4]
Definition: siprdata.h:259
planar YUV 4:2:0, 12bpp, (1 Cr &amp; Cb sample per 2x2 Y samples)
Definition: avcodec.h:4534
int abt_flag
Definition: wmv2.h:41
int cbp_table_index
Definition: wmv2.h:47
main external API structure.
Definition: avcodec.h:1146
static void close(AVCodecParserContext *s)
Definition: h264_parser.c:538
int extradata_size
Definition: avcodec.h:1255
int slice_height
in macroblocks
Definition: mpegvideo.h:641
void ff_msmpeg4_handle_slices(MpegEncContext *s)
Definition: msmpeg4enc.c:325
int pict_type
AV_PICTURE_TYPE_I, AV_PICTURE_TYPE_P, AV_PICTURE_TYPE_B, ...
Definition: mpegvideo.h:381
int bit_rate
wanted bit rate
Definition: mpegvideo.h:252
void * priv_data
Definition: avcodec.h:1182
MpegEncContext.
Definition: mpegvideo.h:245
struct AVCodecContext * avctx
Definition: mpegvideo.h:247
PutBitContext pb
bit output
Definition: mpegvideo.h:318
#define SKIP_TYPE_NONE
Definition: wmv2.h:29
void ff_msmpeg4_code012(PutBitContext *pb, int n)
Definition: msmpeg4enc.c:64
static void flush_put_bits(PutBitContext *s)
Pad the end of the output stream with zeros.
Definition: put_bits.h:89
static void init_put_bits(PutBitContext *s, uint8_t *buffer, int buffer_size)
Initialize the PutBitContext s.
Definition: put_bits.h:54
int den
denominator
Definition: rational.h:45
const uint32_t(*const [WMV2_INTER_CBP_TABLE_COUNT] ff_wmv2_inter_table)[2]
Definition: msmpeg4data.c:1980
av_cold void ff_wmv2_common_init(Wmv2Context *w)
Definition: wmv2.c:28
int rl_table_index
Definition: mpegvideo.h:637
int mspel_bit
Definition: wmv2.h:46
int ff_msmpeg4_coded_block_pred(MpegEncContext *s, int n, uint8_t **coded_block_ptr)
Definition: msmpeg4.c:152
#define av_assert0(cond)
assert() equivalent, that is always enabled.
Definition: avassert.h:37
int mv_table_index
Definition: mpegvideo.h:636
int h263_aic_dir
AIC direction: 0 = left, 1 = top.
Definition: mpegvideo.h:552
int ff_MPV_encode_picture(AVCodecContext *avctx, AVPacket *pkt, AVFrame *frame, int *got_packet)
const uint8_t ff_table_inter_intra[4][2]
Definition: msmpeg4data.c:1868
int dc_table_index
Definition: mpegvideo.h:639
int top_left_mv_flag
Definition: wmv2.h:48
void * av_mallocz(size_t size) av_malloc_attrib 1(1)
Allocate a block of size bytes with alignment suitable for all memory accesses (including vectors if ...
Definition: mem.c:241
int j_type
Definition: wmv2.h:40
void ff_msmpeg4_encode_block(MpegEncContext *s, int16_t *block, int n)
Definition: msmpeg4enc.c:573
static int16_t block[64]
Definition: dct-test.c:198