path: root/libavcodec/flvenc.c (plain)
blob: 15f794e75e2209f4715d04353db98cc53a4db17b

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
27	void ff_flv_encode_picture_header(MpegEncContext *s, int picture_number)
28	{
29	int format;
30
31	avpriv_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
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	.pix_fmts = (const enum AVPixelFormat[]) { AV_PIX_FMT_YUV420P,
111	AV_PIX_FMT_NONE},
112	.priv_class = &flv_class,
113	};
114