e14a1056e974a2c691d53d36361d9c1d1e36ad46
[libav.git] / libavcodec / flvenc.c
1 /*
2 * FLV Encoding specific code.
3 *
4 * This file is part of Libav.
5 *
6 * Libav 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 * Libav 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 Libav; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
19 */
20
21 #include "flv.h"
22 #include "h263.h"
23 #include "mpegvideo.h"
24
25 void ff_flv_encode_picture_header(MpegEncContext *s, int picture_number)
26 {
27 int format;
28
29 avpriv_align_put_bits(&s->pb);
30
31 put_bits(&s->pb, 17, 1);
32 /* 0: h263 escape codes 1: 11-bit escape codes */
33 put_bits(&s->pb, 5, (s->h263_flv - 1));
34 put_bits(&s->pb, 8,
35 (((int64_t) s->picture_number * 30 * s->avctx->time_base.num) / // FIXME use timestamp
36 s->avctx->time_base.den) & 0xff); /* TemporalReference */
37 if (s->width == 352 && s->height == 288)
38 format = 2;
39 else if (s->width == 176 && s->height == 144)
40 format = 3;
41 else if (s->width == 128 && s->height == 96)
42 format = 4;
43 else if (s->width == 320 && s->height == 240)
44 format = 5;
45 else if (s->width == 160 && s->height == 120)
46 format = 6;
47 else if (s->width <= 255 && s->height <= 255)
48 format = 0; /* use 1 byte width & height */
49 else
50 format = 1; /* use 2 bytes width & height */
51 put_bits(&s->pb, 3, format); /* PictureSize */
52 if (format == 0) {
53 put_bits(&s->pb, 8, s->width);
54 put_bits(&s->pb, 8, s->height);
55 } else if (format == 1) {
56 put_bits(&s->pb, 16, s->width);
57 put_bits(&s->pb, 16, s->height);
58 }
59 put_bits(&s->pb, 2, s->pict_type == AV_PICTURE_TYPE_P); /* PictureType */
60 put_bits(&s->pb, 1, 1); /* DeblockingFlag: on */
61 put_bits(&s->pb, 5, s->qscale); /* Quantizer */
62 put_bits(&s->pb, 1, 0); /* ExtraInformation */
63
64 if (s->h263_aic) {
65 s->y_dc_scale_table =
66 s->c_dc_scale_table = ff_aic_dc_scale_table;
67 } else {
68 s->y_dc_scale_table =
69 s->c_dc_scale_table = ff_mpeg1_dc_scale_table;
70 }
71 }
72
73 void ff_flv2_encode_ac_esc(PutBitContext *pb, int slevel, int level,
74 int run, int last)
75 {
76 if (level < 64) { // 7-bit level
77 put_bits(pb, 1, 0);
78 put_bits(pb, 1, last);
79 put_bits(pb, 6, run);
80
81 put_sbits(pb, 7, slevel);
82 } else {
83 /* 11-bit level */
84 put_bits(pb, 1, 1);
85 put_bits(pb, 1, last);
86 put_bits(pb, 6, run);
87
88 put_sbits(pb, 11, slevel);
89 }
90 }
91
92 FF_MPV_GENERIC_CLASS(flv)
93
94 AVCodec ff_flv_encoder = {
95 .name = "flv",
96 .long_name = NULL_IF_CONFIG_SMALL("FLV / Sorenson Spark / Sorenson H.263 (Flash Video)"),
97 .type = AVMEDIA_TYPE_VIDEO,
98 .id = AV_CODEC_ID_FLV1,
99 .priv_data_size = sizeof(MpegEncContext),
100 .init = ff_mpv_encode_init,
101 .encode2 = ff_mpv_encode_picture,
102 .close = ff_mpv_encode_end,
103 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
104 AV_PIX_FMT_NONE},
105 .priv_class = &flv_class,
106 };