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flvenc.c
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1 /*
2  * FLV Encoding specific code.
3  * This file is part of FFmpeg.
4  *
5  * FFmpeg is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Lesser General Public
7  * License as published by the Free Software Foundation; either
8  * version 2.1 of the License, or (at your option) any later version.
9  *
10  * FFmpeg is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  * Lesser General Public License for more details.
14  *
15  * You should have received a copy of the GNU Lesser General Public
16  * License along with FFmpeg; if not, write to the Free Software
17  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
18  */
19 
20 #include "mpegvideo.h"
21 #include "h263.h"
22 #include "flv.h"
23 
24 void ff_flv_encode_picture_header(MpegEncContext * s, int picture_number)
25 {
26  int format;
27 
29 
30  put_bits(&s->pb, 17, 1);
31  put_bits(&s->pb, 5, (s->h263_flv-1)); /* 0: h263 escape codes 1: 11-bit escape codes */
32  put_bits(&s->pb, 8, (((int64_t)s->picture_number * 30 * s->avctx->time_base.num) / //FIXME use timestamp
33  s->avctx->time_base.den) & 0xff); /* TemporalReference */
34  if (s->width == 352 && s->height == 288)
35  format = 2;
36  else if (s->width == 176 && s->height == 144)
37  format = 3;
38  else if (s->width == 128 && s->height == 96)
39  format = 4;
40  else if (s->width == 320 && s->height == 240)
41  format = 5;
42  else if (s->width == 160 && s->height == 120)
43  format = 6;
44  else if (s->width <= 255 && s->height <= 255)
45  format = 0; /* use 1 byte width & height */
46  else
47  format = 1; /* use 2 bytes width & height */
48  put_bits(&s->pb, 3, format); /* PictureSize */
49  if (format == 0) {
50  put_bits(&s->pb, 8, s->width);
51  put_bits(&s->pb, 8, s->height);
52  } else if (format == 1) {
53  put_bits(&s->pb, 16, s->width);
54  put_bits(&s->pb, 16, s->height);
55  }
56  put_bits(&s->pb, 2, s->pict_type == AV_PICTURE_TYPE_P); /* PictureType */
57  put_bits(&s->pb, 1, 1); /* DeblockingFlag: on */
58  put_bits(&s->pb, 5, s->qscale); /* Quantizer */
59  put_bits(&s->pb, 1, 0); /* ExtraInformation */
60 
61  if(s->h263_aic){
64  }else{
67  }
68 }
69 
70 void ff_flv2_encode_ac_esc(PutBitContext *pb, int slevel, int level, int run, int last){
71  if(level < 64) { // 7-bit level
72  put_bits(pb, 1, 0);
73  put_bits(pb, 1, last);
74  put_bits(pb, 6, run);
75 
76  put_sbits(pb, 7, slevel);
77  } else {
78  /* 11-bit level */
79  put_bits(pb, 1, 1);
80  put_bits(pb, 1, last);
81  put_bits(pb, 6, run);
82 
83  put_sbits(pb, 11, slevel);
84  }
85 }
86 
88 
90  .name = "flv",
91  .long_name = NULL_IF_CONFIG_SMALL("FLV / Sorenson Spark / Sorenson H.263 (Flash Video)"),
92  .type = AVMEDIA_TYPE_VIDEO,
93  .id = AV_CODEC_ID_FLV1,
94  .priv_data_size = sizeof(MpegEncContext),
96  .encode2 = ff_mpv_encode_picture,
98  .pix_fmts = (const enum AVPixelFormat[]){ AV_PIX_FMT_YUV420P, AV_PIX_FMT_NONE },
99  .priv_class = &flv_class,
100 };