Add Haivision SRT protocol
[libav.git] / libavformat / gif.c
CommitLineData
6cea494e 1/*
7fbde343 2 * Animated GIF muxer
406792e7 3 * Copyright (c) 2000 Fabrice Bellard
6cea494e 4 *
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5 * first version by Francois Revol <revol@free.fr>
6 *
2912e87a 7 * This file is part of Libav.
b78e7197 8 *
2912e87a 9 * Libav is free software; you can redistribute it and/or
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10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
b78e7197 12 * version 2.1 of the License, or (at your option) any later version.
6cea494e 13 *
2912e87a 14 * Libav is distributed in the hope that it will be useful,
6cea494e 15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
6cea494e 18 *
19720f15 19 * You should have received a copy of the GNU Lesser General Public
2912e87a 20 * License along with Libav; if not, write to the Free Software
5509bffa 21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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22 */
23
24/*
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25 * Features and limitations:
26 * - currently no compression is performed,
27 * in fact the size of the data is 9/8 the size of the image in 8bpp
28 * - uses only a global standard palette
29 * - tested with IE 5.0, Opera for BeOS, NetPositive (BeOS), and Mozilla (BeOS).
30 *
31 * Reference documents:
32 * http://www.goice.co.jp/member/mo/formats/gif.html
33 * http://astronomy.swin.edu.au/pbourke/dataformats/gif/
34 * http://www.dcs.ed.ac.uk/home/mxr/gfx/2d/GIF89a.txt
35 *
36 * this url claims to have an LZW algorithm not covered by Unisys patent:
37 * http://www.msg.net/utility/whirlgif/gifencod.html
38 * could help reduce the size of the files _a lot_...
39 * some sites mentions an RLE type compression also.
40 */
41
42#include "avformat.h"
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43#include "libavutil/log.h"
44#include "libavutil/opt.h"
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45
46/* The GIF format uses reversed order for bitstreams... */
47/* at least they don't use PDP_ENDIAN :) */
48#define BITSTREAM_WRITER_LE
49
b2755007 50#include "libavcodec/put_bits.h"
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51
52/* bitstream minipacket size */
53#define GIF_CHUNKS 100
54
8108551a 55/* slows down the decoding (and some browsers don't like it) */
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56/* update on the 'some browsers don't like it issue from above:
57 * this was probably due to missing 'Data Sub-block Terminator'
58 * (byte 19) in the app_header */
8108551a 59#define GIF_ADD_APP_HEADER // required to enable looping of animated gif
6cea494e 60
daf8cf35 61typedef struct rgb_triplet {
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62 unsigned char r;
63 unsigned char g;
64 unsigned char b;
65} rgb_triplet;
66
67/* we use the standard 216 color palette */
68
69/* this script was used to create the palette:
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70 * for r in 00 33 66 99 cc ff; do
71 * for g in 00 33 66 99 cc ff; do
72 * echo -n " "
73 * for b in 00 33 66 99 cc ff; do
74 * echo -n "{ 0x$r, 0x$g, 0x$b }, "
75 * done
76 * echo ""
77 * done
78 * done
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79 */
80
84082497 81static const rgb_triplet gif_clut[216] = {
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82 { 0x00, 0x00, 0x00 }, { 0x00, 0x00, 0x33 }, { 0x00, 0x00, 0x66 }, { 0x00, 0x00, 0x99 }, { 0x00, 0x00, 0xcc }, { 0x00, 0x00, 0xff },
83 { 0x00, 0x33, 0x00 }, { 0x00, 0x33, 0x33 }, { 0x00, 0x33, 0x66 }, { 0x00, 0x33, 0x99 }, { 0x00, 0x33, 0xcc }, { 0x00, 0x33, 0xff },
84 { 0x00, 0x66, 0x00 }, { 0x00, 0x66, 0x33 }, { 0x00, 0x66, 0x66 }, { 0x00, 0x66, 0x99 }, { 0x00, 0x66, 0xcc }, { 0x00, 0x66, 0xff },
85 { 0x00, 0x99, 0x00 }, { 0x00, 0x99, 0x33 }, { 0x00, 0x99, 0x66 }, { 0x00, 0x99, 0x99 }, { 0x00, 0x99, 0xcc }, { 0x00, 0x99, 0xff },
86 { 0x00, 0xcc, 0x00 }, { 0x00, 0xcc, 0x33 }, { 0x00, 0xcc, 0x66 }, { 0x00, 0xcc, 0x99 }, { 0x00, 0xcc, 0xcc }, { 0x00, 0xcc, 0xff },
87 { 0x00, 0xff, 0x00 }, { 0x00, 0xff, 0x33 }, { 0x00, 0xff, 0x66 }, { 0x00, 0xff, 0x99 }, { 0x00, 0xff, 0xcc }, { 0x00, 0xff, 0xff },
88 { 0x33, 0x00, 0x00 }, { 0x33, 0x00, 0x33 }, { 0x33, 0x00, 0x66 }, { 0x33, 0x00, 0x99 }, { 0x33, 0x00, 0xcc }, { 0x33, 0x00, 0xff },
89 { 0x33, 0x33, 0x00 }, { 0x33, 0x33, 0x33 }, { 0x33, 0x33, 0x66 }, { 0x33, 0x33, 0x99 }, { 0x33, 0x33, 0xcc }, { 0x33, 0x33, 0xff },
90 { 0x33, 0x66, 0x00 }, { 0x33, 0x66, 0x33 }, { 0x33, 0x66, 0x66 }, { 0x33, 0x66, 0x99 }, { 0x33, 0x66, 0xcc }, { 0x33, 0x66, 0xff },
91 { 0x33, 0x99, 0x00 }, { 0x33, 0x99, 0x33 }, { 0x33, 0x99, 0x66 }, { 0x33, 0x99, 0x99 }, { 0x33, 0x99, 0xcc }, { 0x33, 0x99, 0xff },
92 { 0x33, 0xcc, 0x00 }, { 0x33, 0xcc, 0x33 }, { 0x33, 0xcc, 0x66 }, { 0x33, 0xcc, 0x99 }, { 0x33, 0xcc, 0xcc }, { 0x33, 0xcc, 0xff },
93 { 0x33, 0xff, 0x00 }, { 0x33, 0xff, 0x33 }, { 0x33, 0xff, 0x66 }, { 0x33, 0xff, 0x99 }, { 0x33, 0xff, 0xcc }, { 0x33, 0xff, 0xff },
94 { 0x66, 0x00, 0x00 }, { 0x66, 0x00, 0x33 }, { 0x66, 0x00, 0x66 }, { 0x66, 0x00, 0x99 }, { 0x66, 0x00, 0xcc }, { 0x66, 0x00, 0xff },
95 { 0x66, 0x33, 0x00 }, { 0x66, 0x33, 0x33 }, { 0x66, 0x33, 0x66 }, { 0x66, 0x33, 0x99 }, { 0x66, 0x33, 0xcc }, { 0x66, 0x33, 0xff },
96 { 0x66, 0x66, 0x00 }, { 0x66, 0x66, 0x33 }, { 0x66, 0x66, 0x66 }, { 0x66, 0x66, 0x99 }, { 0x66, 0x66, 0xcc }, { 0x66, 0x66, 0xff },
97 { 0x66, 0x99, 0x00 }, { 0x66, 0x99, 0x33 }, { 0x66, 0x99, 0x66 }, { 0x66, 0x99, 0x99 }, { 0x66, 0x99, 0xcc }, { 0x66, 0x99, 0xff },
98 { 0x66, 0xcc, 0x00 }, { 0x66, 0xcc, 0x33 }, { 0x66, 0xcc, 0x66 }, { 0x66, 0xcc, 0x99 }, { 0x66, 0xcc, 0xcc }, { 0x66, 0xcc, 0xff },
99 { 0x66, 0xff, 0x00 }, { 0x66, 0xff, 0x33 }, { 0x66, 0xff, 0x66 }, { 0x66, 0xff, 0x99 }, { 0x66, 0xff, 0xcc }, { 0x66, 0xff, 0xff },
100 { 0x99, 0x00, 0x00 }, { 0x99, 0x00, 0x33 }, { 0x99, 0x00, 0x66 }, { 0x99, 0x00, 0x99 }, { 0x99, 0x00, 0xcc }, { 0x99, 0x00, 0xff },
101 { 0x99, 0x33, 0x00 }, { 0x99, 0x33, 0x33 }, { 0x99, 0x33, 0x66 }, { 0x99, 0x33, 0x99 }, { 0x99, 0x33, 0xcc }, { 0x99, 0x33, 0xff },
102 { 0x99, 0x66, 0x00 }, { 0x99, 0x66, 0x33 }, { 0x99, 0x66, 0x66 }, { 0x99, 0x66, 0x99 }, { 0x99, 0x66, 0xcc }, { 0x99, 0x66, 0xff },
103 { 0x99, 0x99, 0x00 }, { 0x99, 0x99, 0x33 }, { 0x99, 0x99, 0x66 }, { 0x99, 0x99, 0x99 }, { 0x99, 0x99, 0xcc }, { 0x99, 0x99, 0xff },
104 { 0x99, 0xcc, 0x00 }, { 0x99, 0xcc, 0x33 }, { 0x99, 0xcc, 0x66 }, { 0x99, 0xcc, 0x99 }, { 0x99, 0xcc, 0xcc }, { 0x99, 0xcc, 0xff },
105 { 0x99, 0xff, 0x00 }, { 0x99, 0xff, 0x33 }, { 0x99, 0xff, 0x66 }, { 0x99, 0xff, 0x99 }, { 0x99, 0xff, 0xcc }, { 0x99, 0xff, 0xff },
106 { 0xcc, 0x00, 0x00 }, { 0xcc, 0x00, 0x33 }, { 0xcc, 0x00, 0x66 }, { 0xcc, 0x00, 0x99 }, { 0xcc, 0x00, 0xcc }, { 0xcc, 0x00, 0xff },
107 { 0xcc, 0x33, 0x00 }, { 0xcc, 0x33, 0x33 }, { 0xcc, 0x33, 0x66 }, { 0xcc, 0x33, 0x99 }, { 0xcc, 0x33, 0xcc }, { 0xcc, 0x33, 0xff },
108 { 0xcc, 0x66, 0x00 }, { 0xcc, 0x66, 0x33 }, { 0xcc, 0x66, 0x66 }, { 0xcc, 0x66, 0x99 }, { 0xcc, 0x66, 0xcc }, { 0xcc, 0x66, 0xff },
109 { 0xcc, 0x99, 0x00 }, { 0xcc, 0x99, 0x33 }, { 0xcc, 0x99, 0x66 }, { 0xcc, 0x99, 0x99 }, { 0xcc, 0x99, 0xcc }, { 0xcc, 0x99, 0xff },
110 { 0xcc, 0xcc, 0x00 }, { 0xcc, 0xcc, 0x33 }, { 0xcc, 0xcc, 0x66 }, { 0xcc, 0xcc, 0x99 }, { 0xcc, 0xcc, 0xcc }, { 0xcc, 0xcc, 0xff },
111 { 0xcc, 0xff, 0x00 }, { 0xcc, 0xff, 0x33 }, { 0xcc, 0xff, 0x66 }, { 0xcc, 0xff, 0x99 }, { 0xcc, 0xff, 0xcc }, { 0xcc, 0xff, 0xff },
112 { 0xff, 0x00, 0x00 }, { 0xff, 0x00, 0x33 }, { 0xff, 0x00, 0x66 }, { 0xff, 0x00, 0x99 }, { 0xff, 0x00, 0xcc }, { 0xff, 0x00, 0xff },
113 { 0xff, 0x33, 0x00 }, { 0xff, 0x33, 0x33 }, { 0xff, 0x33, 0x66 }, { 0xff, 0x33, 0x99 }, { 0xff, 0x33, 0xcc }, { 0xff, 0x33, 0xff },
114 { 0xff, 0x66, 0x00 }, { 0xff, 0x66, 0x33 }, { 0xff, 0x66, 0x66 }, { 0xff, 0x66, 0x99 }, { 0xff, 0x66, 0xcc }, { 0xff, 0x66, 0xff },
115 { 0xff, 0x99, 0x00 }, { 0xff, 0x99, 0x33 }, { 0xff, 0x99, 0x66 }, { 0xff, 0x99, 0x99 }, { 0xff, 0x99, 0xcc }, { 0xff, 0x99, 0xff },
116 { 0xff, 0xcc, 0x00 }, { 0xff, 0xcc, 0x33 }, { 0xff, 0xcc, 0x66 }, { 0xff, 0xcc, 0x99 }, { 0xff, 0xcc, 0xcc }, { 0xff, 0xcc, 0xff },
117 { 0xff, 0xff, 0x00 }, { 0xff, 0xff, 0x33 }, { 0xff, 0xff, 0x66 }, { 0xff, 0xff, 0x99 }, { 0xff, 0xff, 0xcc }, { 0xff, 0xff, 0xff },
118};
119
ba19f848 120/* GIF header */
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121static int gif_image_write_header(AVIOContext *pb, int width, int height,
122 int loop_count, uint32_t *palette)
6cea494e 123{
ba19f848 124 int i;
84ab361f 125 unsigned int v;
6cea494e 126
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127 avio_write(pb, "GIF", 3);
128 avio_write(pb, "89a", 3);
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129 avio_wl16(pb, width);
130 avio_wl16(pb, height);
6cea494e 131
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132 avio_w8(pb, 0xf7); /* flags: global clut, 256 entries */
133 avio_w8(pb, 0x1f); /* background color index */
134 avio_w8(pb, 0); /* aspect ratio */
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135
136 /* the global palette */
84ab361f 137 if (!palette) {
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138 avio_write(pb, (const unsigned char *)gif_clut, 216 * 3);
139 for (i = 0; i < ((256 - 216) * 3); i++)
77eb5504 140 avio_w8(pb, 0);
84ab361f 141 } else {
33510e86 142 for (i = 0; i < 256; i++) {
84ab361f 143 v = palette[i];
77eb5504 144 avio_w8(pb, (v >> 16) & 0xff);
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145 avio_w8(pb, (v >> 8) & 0xff);
146 avio_w8(pb, (v) & 0xff);
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147 }
148 }
6cea494e 149
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150 /* update: this is the 'NETSCAPE EXTENSION' that allows for looped animated
151 * GIF, see http://members.aol.com/royalef/gifabout.htm#net-extension
152 *
153 * byte 1 : 33 (hex 0x21) GIF Extension code
154 * byte 2 : 255 (hex 0xFF) Application Extension Label
155 * byte 3 : 11 (hex (0x0B) Length of Application Block
156 * (eleven bytes of data to follow)
157 * bytes 4 to 11 : "NETSCAPE"
158 * bytes 12 to 14 : "2.0"
159 * byte 15 : 3 (hex 0x03) Length of Data Sub-Block
160 * (three bytes of data to follow)
161 * byte 16 : 1 (hex 0x01)
162 * bytes 17 to 18 : 0 to 65535, an unsigned integer in
163 * lo-hi byte format. This indicate the
164 * number of iterations the loop should
165 * be executed.
166 * bytes 19 : 0 (hex 0x00) a Data Sub-block Terminator
167 */
8108551a 168
6cea494e 169 /* application extension header */
6cea494e 170#ifdef GIF_ADD_APP_HEADER
8108551a 171 if (loop_count >= 0 && loop_count <= 65535) {
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172 avio_w8(pb, 0x21);
173 avio_w8(pb, 0xff);
174 avio_w8(pb, 0x0b);
175 // bytes 4 to 14
176 avio_write(pb, "NETSCAPE2.0", sizeof("NETSCAPE2.0") - 1);
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177 avio_w8(pb, 0x03); // byte 15
178 avio_w8(pb, 0x01); // byte 16
179 avio_wl16(pb, (uint16_t)loop_count);
180 avio_w8(pb, 0x00); // byte 19
8108551a 181 }
6cea494e 182#endif
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183 return 0;
184}
185
186/* this is maybe slow, but allows for extensions */
0c1a9eda 187static inline unsigned char gif_clut_index(uint8_t r, uint8_t g, uint8_t b)
6cea494e 188{
ccd425e7 189 return (((r) / 47) % 6) * 6 * 6 + (((g) / 47) % 6) * 6 + (((b) / 47) % 6);
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190}
191
ae628ec1 192static int gif_image_write_image(AVIOContext *pb,
ba19f848 193 int x1, int y1, int width, int height,
49057904 194 const uint8_t *buf, int linesize, int pix_fmt)
6cea494e 195{
6cea494e 196 PutBitContext p;
0c1a9eda 197 uint8_t buffer[200]; /* 100 * 9 / 8 = 113 */
84ab361f 198 int i, left, w, v;
49057904 199 const uint8_t *ptr;
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200 /* image block */
201
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202 avio_w8(pb, 0x2c);
203 avio_wl16(pb, x1);
204 avio_wl16(pb, y1);
205 avio_wl16(pb, width);
206 avio_wl16(pb, height);
207 avio_w8(pb, 0x00); /* flags */
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208 /* no local clut */
209
77eb5504 210 avio_w8(pb, 0x08);
6cea494e 211
33510e86 212 left = width * height;
6cea494e 213
117a5490 214 init_put_bits(&p, buffer, 130);
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215
216/*
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217 * the thing here is the bitstream is written as little packets, with a size
218 * byte before but it's still the same bitstream between packets (no flush !)
6cea494e 219 */
ba19f848 220 ptr = buf;
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221 w = width;
222 while (left > 0) {
6d32ec6c 223 put_bits(&p, 9, 0x0100); /* clear code */
6cea494e 224
33510e86 225 for (i = (left < GIF_CHUNKS) ? left : GIF_CHUNKS; i; i--) {
716d413c 226 if (pix_fmt == AV_PIX_FMT_RGB24) {
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227 v = gif_clut_index(ptr[0], ptr[1], ptr[2]);
228 ptr += 3;
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229 } else {
230 v = *ptr++;
231 }
6d32ec6c 232 put_bits(&p, 9, v);
ba19f848 233 if (--w == 0) {
33510e86 234 w = width;
ba19f848 235 buf += linesize;
33510e86 236 ptr = buf;
ba19f848 237 }
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238 }
239
33510e86 240 if (left <= GIF_CHUNKS) {
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241 put_bits(&p, 9, 0x101); /* end of stream */
242 flush_put_bits(&p);
6cea494e 243 }
33510e86 244 if (put_bits_ptr(&p) - p.buf > 0) {
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245 avio_w8(pb, put_bits_ptr(&p) - p.buf); /* byte count of the packet */
246 avio_write(pb, p.buf, put_bits_ptr(&p) - p.buf); /* the actual buffer */
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247 p.buf_ptr = p.buf; /* dequeue the bytes off the bitstream */
248 }
33510e86 249 left -= GIF_CHUNKS;
6cea494e 250 }
77eb5504 251 avio_w8(pb, 0x00); /* end of image block */
115329f1 252
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253 return 0;
254}
255
daf8cf35 256typedef struct GIFContext {
d31e3f7c 257 AVClass *class; /** Class for private options. */
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258 int64_t time, file_time;
259 uint8_t buffer[100]; /* data chunks */
d31e3f7c 260 int loop;
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261} GIFContext;
262
263static int gif_write_header(AVFormatContext *s)
264{
265 GIFContext *gif = s->priv_data;
ae628ec1 266 AVIOContext *pb = s->pb;
9200514a 267 AVCodecParameters *par, *video_par;
d31e3f7c 268 int i, width, height /*, rate*/;
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269
270/* XXX: do we reject audio streams or just ignore them ?
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271 * if (s->nb_streams > 1)
272 * return -1;
273 */
274 gif->time = 0;
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275 gif->file_time = 0;
276
9200514a 277 video_par = NULL;
33510e86 278 for (i = 0; i < s->nb_streams; i++) {
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279 par = s->streams[i]->codecpar;
280 if (par->codec_type != AVMEDIA_TYPE_AUDIO)
281 video_par = par;
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282 }
283
9200514a 284 if (!video_par) {
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285 av_free(gif);
286 return -1;
287 } else {
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288 width = video_par->width;
289 height = video_par->height;
c0df9d75 290// rate = video_enc->time_base.den;
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291 }
292
9200514a 293 if (video_par->format != AV_PIX_FMT_RGB24) {
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294 av_log(s, AV_LOG_ERROR,
295 "ERROR: gif only handles the rgb24 pixel format. Use -pix_fmt rgb24.\n");
6f3e0b21 296 return AVERROR(EIO);
20dd25ad 297 }
ba19f848 298
d31e3f7c 299 gif_image_write_header(pb, width, height, gif->loop, NULL);
ba19f848 300
b7f2fdde 301 avio_flush(s->pb);
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302 return 0;
303}
304
9200514a 305static int gif_write_video(AVFormatContext *s, AVStream *st,
33510e86 306 const uint8_t *buf, int size)
ba19f848 307{
9200514a 308 AVCodecParameters *par = st->codecpar;
ae628ec1 309 AVIOContext *pb = s->pb;
ba19f848 310 int jiffies;
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311
312 /* graphic control extension block */
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313 avio_w8(pb, 0x21);
314 avio_w8(pb, 0xf9);
315 avio_w8(pb, 0x04); /* block size */
316 avio_w8(pb, 0x04); /* flags */
115329f1 317
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318 /* 1 jiffy is 1/70 s */
319 /* the delay_time field indicates the number of jiffies - 1 */
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320 /* XXX: should use delay, in order to be more accurate */
321 /* instead of using the same rounded value each time */
322 /* XXX: don't even remember if I really use it for now */
9200514a 323 jiffies = (70 * st->time_base.num / st->time_base.den) - 1;
ba19f848 324
77eb5504 325 avio_wl16(pb, jiffies);
ba19f848 326
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327 avio_w8(pb, 0x1f); /* transparent color index */
328 avio_w8(pb, 0x00);
ba19f848 329
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330 gif_image_write_image(pb, 0, 0, par->width, par->height,
331 buf, par->width * 3, AV_PIX_FMT_RGB24);
6cea494e 332
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333 return 0;
334}
335
e928649b 336static int gif_write_packet(AVFormatContext *s, AVPacket *pkt)
6cea494e 337{
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338 AVCodecParameters *par = s->streams[pkt->stream_index]->codecpar;
339 if (par->codec_type == AVMEDIA_TYPE_AUDIO)
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340 return 0; /* just ignore audio */
341 else
9200514a 342 return gif_write_video(s, s->streams[pkt->stream_index], pkt->data, pkt->size);
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343}
344
345static int gif_write_trailer(AVFormatContext *s)
346{
ae628ec1 347 AVIOContext *pb = s->pb;
6cea494e 348
77eb5504 349 avio_w8(pb, 0x3b);
3b4bb19e 350
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351 return 0;
352}
353
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354#define OFFSET(x) offsetof(GIFContext, x)
355#define ENC AV_OPT_FLAG_ENCODING_PARAM
356static const AVOption options[] = {
33510e86 357 { "loop", "Number of times to loop the output.", OFFSET(loop),
e6153f17 358 AV_OPT_TYPE_INT, { .i64 = 0 }, 0, 65535, ENC },
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359 { NULL },
360};
361
362static const AVClass gif_muxer_class = {
363 .class_name = "GIF muxer",
364 .item_name = av_default_item_name,
365 .version = LIBAVUTIL_VERSION_INT,
366 .option = options,
367};
368
c6610a21 369AVOutputFormat ff_gif_muxer = {
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370 .name = "gif",
371 .long_name = NULL_IF_CONFIG_SMALL("GIF Animation"),
372 .mime_type = "image/gif",
373 .extensions = "gif",
374 .priv_data_size = sizeof(GIFContext),
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375 .audio_codec = AV_CODEC_ID_NONE,
376 .video_codec = AV_CODEC_ID_RAWVIDEO,
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377 .write_header = gif_write_header,
378 .write_packet = gif_write_packet,
379 .write_trailer = gif_write_trailer,
380 .priv_class = &gif_muxer_class,
6cea494e 381};