1 /*
2 * FLV Encoding specific code.
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 "flv.h"
22 #include "h263.h"
23 #include "h263data.h"
24 #include "mpegvideo.h"
25 #include "mpegvideodata.h"
26
ff_flv_encode_picture_header(MpegEncContext * s,int picture_number)27 void ff_flv_encode_picture_header(MpegEncContext *s, int picture_number)
28 {
29 int format;
30
31 align_put_bits(&s->pb);
32
33 put_bits(&s->pb, 17, 1);
34 /* 0: H.263 escape codes 1: 11-bit escape codes */
35 put_bits(&s->pb, 5, (s->h263_flv - 1));
36 put_bits(&s->pb, 8,
37 (((int64_t) s->picture_number * 30 * s->avctx->time_base.num) / // FIXME use timestamp
38 s->avctx->time_base.den) & 0xff); /* TemporalReference */
39 if (s->width == 352 && s->height == 288)
40 format = 2;
41 else if (s->width == 176 && s->height == 144)
42 format = 3;
43 else if (s->width == 128 && s->height == 96)
44 format = 4;
45 else if (s->width == 320 && s->height == 240)
46 format = 5;
47 else if (s->width == 160 && s->height == 120)
48 format = 6;
49 else if (s->width <= 255 && s->height <= 255)
50 format = 0; /* use 1 byte width & height */
51 else
52 format = 1; /* use 2 bytes width & height */
53 put_bits(&s->pb, 3, format); /* PictureSize */
54 if (format == 0) {
55 put_bits(&s->pb, 8, s->width);
56 put_bits(&s->pb, 8, s->height);
57 } else if (format == 1) {
58 put_bits(&s->pb, 16, s->width);
59 put_bits(&s->pb, 16, s->height);
60 }
61 put_bits(&s->pb, 2, s->pict_type == AV_PICTURE_TYPE_P); /* PictureType */
62 put_bits(&s->pb, 1, 1); /* DeblockingFlag: on */
63 put_bits(&s->pb, 5, s->qscale); /* Quantizer */
64 put_bits(&s->pb, 1, 0); /* ExtraInformation */
65
66 if (s->h263_aic) {
67 s->y_dc_scale_table =
68 s->c_dc_scale_table = ff_aic_dc_scale_table;
69 } else {
70 s->y_dc_scale_table =
71 s->c_dc_scale_table = ff_mpeg1_dc_scale_table;
72 }
73 }
74
ff_flv2_encode_ac_esc(PutBitContext * pb,int slevel,int level,int run,int last)75 void ff_flv2_encode_ac_esc(PutBitContext *pb, int slevel, int level,
76 int run, int last)
77 {
78 if (level < 64) { // 7-bit level
79 put_bits(pb, 1, 0);
80 put_bits(pb, 1, last);
81 put_bits(pb, 6, run);
82
83 put_sbits(pb, 7, slevel);
84 } else {
85 /* 11-bit level */
86 put_bits(pb, 1, 1);
87 put_bits(pb, 1, last);
88 put_bits(pb, 6, run);
89
90 put_sbits(pb, 11, slevel);
91 }
92 }
93
94 static const AVClass flv_class = {
95 .class_name = "flv encoder",
96 .item_name = av_default_item_name,
97 .option = ff_mpv_generic_options,
98 .version = LIBAVUTIL_VERSION_INT,
99 };
100
101 AVCodec ff_flv_encoder = {
102 .name = "flv",
103 .long_name = NULL_IF_CONFIG_SMALL("FLV / Sorenson Spark / Sorenson H.263 (Flash Video)"),
104 .type = AVMEDIA_TYPE_VIDEO,
105 .id = AV_CODEC_ID_FLV1,
106 .priv_data_size = sizeof(MpegEncContext),
107 .init = ff_mpv_encode_init,
108 .encode2 = ff_mpv_encode_picture,
109 .close = ff_mpv_encode_end,
110 .caps_internal = FF_CODEC_CAP_INIT_CLEANUP,
111 .pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
112 AV_PIX_FMT_NONE},
113 .priv_class = &flv_class,
114 };
115