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[libav.git] / libavformat / gif.c
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1/*
2 * Animated GIF encoder
19720f15 3 * Copyright (c) 2000 Fabrice Bellard.
6cea494e 4 *
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5 * This library 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 of the License, or (at your option) any later version.
6cea494e 9 *
19720f15 10 * This library is distributed in the hope that it will be useful,
6cea494e 11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 * Lesser General Public License for more details.
6cea494e 14 *
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15 * You should have received a copy of the GNU Lesser General Public
16 * License along with this library; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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18 */
19
20/*
21 * First version by Francois Revol revol@free.fr
22 *
23 * Features and limitations:
24 * - currently no compression is performed,
25 * in fact the size of the data is 9/8 the size of the image in 8bpp
26 * - uses only a global standard palette
27 * - tested with IE 5.0, Opera for BeOS, NetPositive (BeOS), and Mozilla (BeOS).
28 *
29 * Reference documents:
30 * http://www.goice.co.jp/member/mo/formats/gif.html
31 * http://astronomy.swin.edu.au/pbourke/dataformats/gif/
32 * http://www.dcs.ed.ac.uk/home/mxr/gfx/2d/GIF89a.txt
33 *
34 * this url claims to have an LZW algorithm not covered by Unisys patent:
35 * http://www.msg.net/utility/whirlgif/gifencod.html
36 * could help reduce the size of the files _a lot_...
37 * some sites mentions an RLE type compression also.
38 */
39
40#include "avformat.h"
2de7795a 41#include "bitstream.h"
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42
43/* bitstream minipacket size */
44#define GIF_CHUNKS 100
45
46/* slows down the decoding (and some browsers doesn't like it) */
47/* #define GIF_ADD_APP_HEADER */
48
49typedef struct {
50 unsigned char r;
51 unsigned char g;
52 unsigned char b;
53} rgb_triplet;
54
55/* we use the standard 216 color palette */
56
57/* this script was used to create the palette:
58 * for r in 00 33 66 99 cc ff; do for g in 00 33 66 99 cc ff; do echo -n " "; for b in 00 33 66 99 cc ff; do
59 * echo -n "{ 0x$r, 0x$g, 0x$b }, "; done; echo ""; done; done
60 */
61
84082497 62static const rgb_triplet gif_clut[216] = {
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63 { 0x00, 0x00, 0x00 }, { 0x00, 0x00, 0x33 }, { 0x00, 0x00, 0x66 }, { 0x00, 0x00, 0x99 }, { 0x00, 0x00, 0xcc }, { 0x00, 0x00, 0xff },
64 { 0x00, 0x33, 0x00 }, { 0x00, 0x33, 0x33 }, { 0x00, 0x33, 0x66 }, { 0x00, 0x33, 0x99 }, { 0x00, 0x33, 0xcc }, { 0x00, 0x33, 0xff },
65 { 0x00, 0x66, 0x00 }, { 0x00, 0x66, 0x33 }, { 0x00, 0x66, 0x66 }, { 0x00, 0x66, 0x99 }, { 0x00, 0x66, 0xcc }, { 0x00, 0x66, 0xff },
66 { 0x00, 0x99, 0x00 }, { 0x00, 0x99, 0x33 }, { 0x00, 0x99, 0x66 }, { 0x00, 0x99, 0x99 }, { 0x00, 0x99, 0xcc }, { 0x00, 0x99, 0xff },
67 { 0x00, 0xcc, 0x00 }, { 0x00, 0xcc, 0x33 }, { 0x00, 0xcc, 0x66 }, { 0x00, 0xcc, 0x99 }, { 0x00, 0xcc, 0xcc }, { 0x00, 0xcc, 0xff },
68 { 0x00, 0xff, 0x00 }, { 0x00, 0xff, 0x33 }, { 0x00, 0xff, 0x66 }, { 0x00, 0xff, 0x99 }, { 0x00, 0xff, 0xcc }, { 0x00, 0xff, 0xff },
69 { 0x33, 0x00, 0x00 }, { 0x33, 0x00, 0x33 }, { 0x33, 0x00, 0x66 }, { 0x33, 0x00, 0x99 }, { 0x33, 0x00, 0xcc }, { 0x33, 0x00, 0xff },
70 { 0x33, 0x33, 0x00 }, { 0x33, 0x33, 0x33 }, { 0x33, 0x33, 0x66 }, { 0x33, 0x33, 0x99 }, { 0x33, 0x33, 0xcc }, { 0x33, 0x33, 0xff },
71 { 0x33, 0x66, 0x00 }, { 0x33, 0x66, 0x33 }, { 0x33, 0x66, 0x66 }, { 0x33, 0x66, 0x99 }, { 0x33, 0x66, 0xcc }, { 0x33, 0x66, 0xff },
72 { 0x33, 0x99, 0x00 }, { 0x33, 0x99, 0x33 }, { 0x33, 0x99, 0x66 }, { 0x33, 0x99, 0x99 }, { 0x33, 0x99, 0xcc }, { 0x33, 0x99, 0xff },
73 { 0x33, 0xcc, 0x00 }, { 0x33, 0xcc, 0x33 }, { 0x33, 0xcc, 0x66 }, { 0x33, 0xcc, 0x99 }, { 0x33, 0xcc, 0xcc }, { 0x33, 0xcc, 0xff },
74 { 0x33, 0xff, 0x00 }, { 0x33, 0xff, 0x33 }, { 0x33, 0xff, 0x66 }, { 0x33, 0xff, 0x99 }, { 0x33, 0xff, 0xcc }, { 0x33, 0xff, 0xff },
75 { 0x66, 0x00, 0x00 }, { 0x66, 0x00, 0x33 }, { 0x66, 0x00, 0x66 }, { 0x66, 0x00, 0x99 }, { 0x66, 0x00, 0xcc }, { 0x66, 0x00, 0xff },
76 { 0x66, 0x33, 0x00 }, { 0x66, 0x33, 0x33 }, { 0x66, 0x33, 0x66 }, { 0x66, 0x33, 0x99 }, { 0x66, 0x33, 0xcc }, { 0x66, 0x33, 0xff },
77 { 0x66, 0x66, 0x00 }, { 0x66, 0x66, 0x33 }, { 0x66, 0x66, 0x66 }, { 0x66, 0x66, 0x99 }, { 0x66, 0x66, 0xcc }, { 0x66, 0x66, 0xff },
78 { 0x66, 0x99, 0x00 }, { 0x66, 0x99, 0x33 }, { 0x66, 0x99, 0x66 }, { 0x66, 0x99, 0x99 }, { 0x66, 0x99, 0xcc }, { 0x66, 0x99, 0xff },
79 { 0x66, 0xcc, 0x00 }, { 0x66, 0xcc, 0x33 }, { 0x66, 0xcc, 0x66 }, { 0x66, 0xcc, 0x99 }, { 0x66, 0xcc, 0xcc }, { 0x66, 0xcc, 0xff },
80 { 0x66, 0xff, 0x00 }, { 0x66, 0xff, 0x33 }, { 0x66, 0xff, 0x66 }, { 0x66, 0xff, 0x99 }, { 0x66, 0xff, 0xcc }, { 0x66, 0xff, 0xff },
81 { 0x99, 0x00, 0x00 }, { 0x99, 0x00, 0x33 }, { 0x99, 0x00, 0x66 }, { 0x99, 0x00, 0x99 }, { 0x99, 0x00, 0xcc }, { 0x99, 0x00, 0xff },
82 { 0x99, 0x33, 0x00 }, { 0x99, 0x33, 0x33 }, { 0x99, 0x33, 0x66 }, { 0x99, 0x33, 0x99 }, { 0x99, 0x33, 0xcc }, { 0x99, 0x33, 0xff },
83 { 0x99, 0x66, 0x00 }, { 0x99, 0x66, 0x33 }, { 0x99, 0x66, 0x66 }, { 0x99, 0x66, 0x99 }, { 0x99, 0x66, 0xcc }, { 0x99, 0x66, 0xff },
84 { 0x99, 0x99, 0x00 }, { 0x99, 0x99, 0x33 }, { 0x99, 0x99, 0x66 }, { 0x99, 0x99, 0x99 }, { 0x99, 0x99, 0xcc }, { 0x99, 0x99, 0xff },
85 { 0x99, 0xcc, 0x00 }, { 0x99, 0xcc, 0x33 }, { 0x99, 0xcc, 0x66 }, { 0x99, 0xcc, 0x99 }, { 0x99, 0xcc, 0xcc }, { 0x99, 0xcc, 0xff },
86 { 0x99, 0xff, 0x00 }, { 0x99, 0xff, 0x33 }, { 0x99, 0xff, 0x66 }, { 0x99, 0xff, 0x99 }, { 0x99, 0xff, 0xcc }, { 0x99, 0xff, 0xff },
87 { 0xcc, 0x00, 0x00 }, { 0xcc, 0x00, 0x33 }, { 0xcc, 0x00, 0x66 }, { 0xcc, 0x00, 0x99 }, { 0xcc, 0x00, 0xcc }, { 0xcc, 0x00, 0xff },
88 { 0xcc, 0x33, 0x00 }, { 0xcc, 0x33, 0x33 }, { 0xcc, 0x33, 0x66 }, { 0xcc, 0x33, 0x99 }, { 0xcc, 0x33, 0xcc }, { 0xcc, 0x33, 0xff },
89 { 0xcc, 0x66, 0x00 }, { 0xcc, 0x66, 0x33 }, { 0xcc, 0x66, 0x66 }, { 0xcc, 0x66, 0x99 }, { 0xcc, 0x66, 0xcc }, { 0xcc, 0x66, 0xff },
90 { 0xcc, 0x99, 0x00 }, { 0xcc, 0x99, 0x33 }, { 0xcc, 0x99, 0x66 }, { 0xcc, 0x99, 0x99 }, { 0xcc, 0x99, 0xcc }, { 0xcc, 0x99, 0xff },
91 { 0xcc, 0xcc, 0x00 }, { 0xcc, 0xcc, 0x33 }, { 0xcc, 0xcc, 0x66 }, { 0xcc, 0xcc, 0x99 }, { 0xcc, 0xcc, 0xcc }, { 0xcc, 0xcc, 0xff },
92 { 0xcc, 0xff, 0x00 }, { 0xcc, 0xff, 0x33 }, { 0xcc, 0xff, 0x66 }, { 0xcc, 0xff, 0x99 }, { 0xcc, 0xff, 0xcc }, { 0xcc, 0xff, 0xff },
93 { 0xff, 0x00, 0x00 }, { 0xff, 0x00, 0x33 }, { 0xff, 0x00, 0x66 }, { 0xff, 0x00, 0x99 }, { 0xff, 0x00, 0xcc }, { 0xff, 0x00, 0xff },
94 { 0xff, 0x33, 0x00 }, { 0xff, 0x33, 0x33 }, { 0xff, 0x33, 0x66 }, { 0xff, 0x33, 0x99 }, { 0xff, 0x33, 0xcc }, { 0xff, 0x33, 0xff },
95 { 0xff, 0x66, 0x00 }, { 0xff, 0x66, 0x33 }, { 0xff, 0x66, 0x66 }, { 0xff, 0x66, 0x99 }, { 0xff, 0x66, 0xcc }, { 0xff, 0x66, 0xff },
96 { 0xff, 0x99, 0x00 }, { 0xff, 0x99, 0x33 }, { 0xff, 0x99, 0x66 }, { 0xff, 0x99, 0x99 }, { 0xff, 0x99, 0xcc }, { 0xff, 0x99, 0xff },
97 { 0xff, 0xcc, 0x00 }, { 0xff, 0xcc, 0x33 }, { 0xff, 0xcc, 0x66 }, { 0xff, 0xcc, 0x99 }, { 0xff, 0xcc, 0xcc }, { 0xff, 0xcc, 0xff },
98 { 0xff, 0xff, 0x00 }, { 0xff, 0xff, 0x33 }, { 0xff, 0xff, 0x66 }, { 0xff, 0xff, 0x99 }, { 0xff, 0xff, 0xcc }, { 0xff, 0xff, 0xff },
99};
100
101/* The GIF format uses reversed order for bitstreams... */
102/* at least they don't use PDP_ENDIAN :) */
103/* so we 'extend' PutBitContext. hmmm, OOP :) */
104/* seems this thing changed slightly since I wrote it... */
105
106#ifdef ALT_BITSTREAM_WRITER
107# error no ALT_BITSTREAM_WRITER support for now
108#endif
109
84082497 110static void gif_put_bits_rev(PutBitContext *s, int n, unsigned int value)
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111{
112 unsigned int bit_buf;
113 int bit_cnt;
114
115#ifdef STATS
116 st_out_bit_counts[st_current_index] += n;
117#endif
118 // printf("put_bits=%d %x\n", n, value);
119 assert(n == 32 || value < (1U << n));
120
121 bit_buf = s->bit_buf;
122 bit_cnt = 32 - s->bit_left; /* XXX:lazyness... was = s->bit_cnt; */
123
124 // printf("n=%d value=%x cnt=%d buf=%x\n", n, value, bit_cnt, bit_buf);
125 /* XXX: optimize */
126 if (n < (32-bit_cnt)) {
127 bit_buf |= value << (bit_cnt);
128 bit_cnt+=n;
129 } else {
130 bit_buf |= value << (bit_cnt);
131
132 *s->buf_ptr = bit_buf & 0xff;
133 s->buf_ptr[1] = (bit_buf >> 8) & 0xff;
134 s->buf_ptr[2] = (bit_buf >> 16) & 0xff;
135 s->buf_ptr[3] = (bit_buf >> 24) & 0xff;
136
137 //printf("bitbuf = %08x\n", bit_buf);
138 s->buf_ptr+=4;
139 if (s->buf_ptr >= s->buf_end)
140 puts("bit buffer overflow !!"); // should never happen ! who got rid of the callback ???
141// flush_buffer_rev(s);
142 bit_cnt=bit_cnt + n - 32;
143 if (bit_cnt == 0) {
144 bit_buf = 0;
145 } else {
146 bit_buf = value >> (n - bit_cnt);
147 }
148 }
149
150 s->bit_buf = bit_buf;
151 s->bit_left = 32 - bit_cnt;
152}
153
6cea494e 154/* pad the end of the output stream with zeros */
84082497 155static void gif_flush_put_bits_rev(PutBitContext *s)
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156{
157 while (s->bit_left < 32) {
158 /* XXX: should test end of buffer */
159 *s->buf_ptr++=s->bit_buf & 0xff;
160 s->bit_buf>>=8;
161 s->bit_left+=8;
162 }
163// flush_buffer_rev(s);
164 s->bit_left=32;
165 s->bit_buf=0;
166}
167
168/* !RevPutBitContext */
169
ba19f848 170/* GIF header */
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171static int gif_image_write_header(ByteIOContext *pb,
172 int width, int height, uint32_t *palette)
6cea494e 173{
ba19f848 174 int i;
84ab361f 175 unsigned int v;
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176
177 put_tag(pb, "GIF");
178 put_tag(pb, "89a");
179 put_le16(pb, width);
180 put_le16(pb, height);
181
182 put_byte(pb, 0xf7); /* flags: global clut, 256 entries */
183 put_byte(pb, 0x1f); /* background color index */
184 put_byte(pb, 0); /* aspect ratio */
185
186 /* the global palette */
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187 if (!palette) {
188 put_buffer(pb, (unsigned char *)gif_clut, 216*3);
189 for(i=0;i<((256-216)*3);i++)
190 put_byte(pb, 0);
191 } else {
192 for(i=0;i<256;i++) {
193 v = palette[i];
194 put_byte(pb, (v >> 16) & 0xff);
195 put_byte(pb, (v >> 8) & 0xff);
196 put_byte(pb, (v) & 0xff);
197 }
198 }
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199
200 /* application extension header */
201 /* XXX: not really sure what to put in here... */
202#ifdef GIF_ADD_APP_HEADER
203 put_byte(pb, 0x21);
204 put_byte(pb, 0xff);
205 put_byte(pb, 0x0b);
206 put_tag(pb, "NETSCAPE2.0");
207 put_byte(pb, 0x03);
208 put_byte(pb, 0x01);
209 put_byte(pb, 0x00);
210 put_byte(pb, 0x00);
211#endif
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212 return 0;
213}
214
215/* this is maybe slow, but allows for extensions */
0c1a9eda 216static inline unsigned char gif_clut_index(uint8_t r, uint8_t g, uint8_t b)
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217{
218 return ((((r)/47)%6)*6*6+(((g)/47)%6)*6+(((b)/47)%6));
219}
220
6cea494e 221
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222static int gif_image_write_image(ByteIOContext *pb,
223 int x1, int y1, int width, int height,
49057904 224 const uint8_t *buf, int linesize, int pix_fmt)
6cea494e 225{
6cea494e 226 PutBitContext p;
0c1a9eda 227 uint8_t buffer[200]; /* 100 * 9 / 8 = 113 */
84ab361f 228 int i, left, w, v;
49057904 229 const uint8_t *ptr;
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230 /* image block */
231
232 put_byte(pb, 0x2c);
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233 put_le16(pb, x1);
234 put_le16(pb, y1);
235 put_le16(pb, width);
236 put_le16(pb, height);
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237 put_byte(pb, 0x00); /* flags */
238 /* no local clut */
239
240 put_byte(pb, 0x08);
241
ba19f848 242 left= width * height;
6cea494e 243
117a5490 244 init_put_bits(&p, buffer, 130);
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245
246/*
247 * the thing here is the bitstream is written as little packets, with a size byte before
248 * but it's still the same bitstream between packets (no flush !)
249 */
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250 ptr = buf;
251 w = width;
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252 while(left>0) {
253
84082497 254 gif_put_bits_rev(&p, 9, 0x0100); /* clear code */
6cea494e 255
f5fc28d2 256 for(i=(left<GIF_CHUNKS)?left:GIF_CHUNKS;i;i--) {
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257 if (pix_fmt == PIX_FMT_RGB24) {
258 v = gif_clut_index(ptr[0], ptr[1], ptr[2]);
259 ptr+=3;
260 } else {
261 v = *ptr++;
262 }
263 gif_put_bits_rev(&p, 9, v);
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264 if (--w == 0) {
265 w = width;
266 buf += linesize;
267 ptr = buf;
268 }
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269 }
270
271 if(left<=GIF_CHUNKS) {
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272 gif_put_bits_rev(&p, 9, 0x101); /* end of stream */
273 gif_flush_put_bits_rev(&p);
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274 }
275 if(pbBufPtr(&p) - p.buf > 0) {
276 put_byte(pb, pbBufPtr(&p) - p.buf); /* byte count of the packet */
277 put_buffer(pb, p.buf, pbBufPtr(&p) - p.buf); /* the actual buffer */
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278 p.buf_ptr = p.buf; /* dequeue the bytes off the bitstream */
279 }
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280 left-=GIF_CHUNKS;
281 }
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282 put_byte(pb, 0x00); /* end of image block */
283
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284 return 0;
285}
286
287typedef struct {
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288 int64_t time, file_time;
289 uint8_t buffer[100]; /* data chunks */
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290} GIFContext;
291
292static int gif_write_header(AVFormatContext *s)
293{
294 GIFContext *gif = s->priv_data;
295 ByteIOContext *pb = &s->pb;
296 AVCodecContext *enc, *video_enc;
14bea432 297 int i, width, height/*, rate*/;
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298
299/* XXX: do we reject audio streams or just ignore them ?
300 if(s->nb_streams > 1)
301 return -1;
302*/
303 gif->time = 0;
304 gif->file_time = 0;
305
306 video_enc = NULL;
307 for(i=0;i<s->nb_streams;i++) {
308 enc = &s->streams[i]->codec;
309 if (enc->codec_type != CODEC_TYPE_AUDIO)
310 video_enc = enc;
311 }
312
313 if (!video_enc) {
314 av_free(gif);
315 return -1;
316 } else {
317 width = video_enc->width;
318 height = video_enc->height;
c0df9d75 319// rate = video_enc->time_base.den;
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320 }
321
322 /* XXX: is it allowed ? seems to work so far... */
323 video_enc->pix_fmt = PIX_FMT_RGB24;
324
84ab361f 325 gif_image_write_header(pb, width, height, NULL);
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326
327 put_flush_packet(&s->pb);
328 return 0;
329}
330
ba19f848 331static int gif_write_video(AVFormatContext *s,
49057904 332 AVCodecContext *enc, const uint8_t *buf, int size)
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333{
334 ByteIOContext *pb = &s->pb;
335 GIFContext *gif = s->priv_data;
336 int jiffies;
0c1a9eda 337 int64_t delay;
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338
339 /* graphic control extension block */
340 put_byte(pb, 0x21);
341 put_byte(pb, 0xf9);
342 put_byte(pb, 0x04); /* block size */
343 put_byte(pb, 0x04); /* flags */
344
345 /* 1 jiffy is 1/70 s */
346 /* the delay_time field indicates the number of jiffies - 1 */
347 delay = gif->file_time - gif->time;
348
349 /* XXX: should use delay, in order to be more accurate */
350 /* instead of using the same rounded value each time */
351 /* XXX: don't even remember if I really use it for now */
c0df9d75 352 jiffies = (70*enc->time_base.num/enc->time_base.den) - 1;
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353
354 put_le16(pb, jiffies);
355
356 put_byte(pb, 0x1f); /* transparent color index */
357 put_byte(pb, 0x00);
358
359 gif_image_write_image(pb, 0, 0, enc->width, enc->height,
84ab361f 360 buf, enc->width * 3, PIX_FMT_RGB24);
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361
362 put_flush_packet(&s->pb);
363 return 0;
364}
365
e928649b 366static int gif_write_packet(AVFormatContext *s, AVPacket *pkt)
6cea494e 367{
e928649b 368 AVCodecContext *codec = &s->streams[pkt->stream_index]->codec;
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369 if (codec->codec_type == CODEC_TYPE_AUDIO)
370 return 0; /* just ignore audio */
371 else
e928649b 372 return gif_write_video(s, codec, pkt->data, pkt->size);
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373}
374
375static int gif_write_trailer(AVFormatContext *s)
376{
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377 ByteIOContext *pb = &s->pb;
378
379 put_byte(pb, 0x3b);
380 put_flush_packet(&s->pb);
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381 return 0;
382}
383
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384/* better than nothing gif image writer */
385int gif_write(ByteIOContext *pb, AVImageInfo *info)
386{
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387 gif_image_write_header(pb, info->width, info->height,
388 (uint32_t *)info->pict.data[1]);
ba19f848 389 gif_image_write_image(pb, 0, 0, info->width, info->height,
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390 info->pict.data[0], info->pict.linesize[0],
391 PIX_FMT_PAL8);
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392 put_byte(pb, 0x3b);
393 put_flush_packet(pb);
394 return 0;
395}
396
c9a65ca8 397static AVOutputFormat gif_oformat = {
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398 "gif",
399 "GIF Animation",
400 "image/gif",
401 "gif",
c9a65ca8 402 sizeof(GIFContext),
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403 CODEC_ID_NONE,
404 CODEC_ID_RAWVIDEO,
405 gif_write_header,
406 gif_write_packet,
407 gif_write_trailer,
6cea494e 408};
ba19f848 409
12b64a22 410extern AVInputFormat gif_iformat;
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411
412int gif_init(void)
413{
414 av_register_output_format(&gif_oformat);
12b64a22 415 av_register_input_format(&gif_iformat);
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416 return 0;
417}