2191c3395d54c5e0ed6708fba1e6624261a865e9
[libav.git] / libavformat / riff.c
1 /*
2 * RIFF common functions and data
3 * Copyright (c) 2000 Fabrice Bellard
4 *
5 * This file is part of Libav.
6 *
7 * Libav is free software; you can redistribute it and/or
8 * modify it under the terms of the GNU Lesser General Public
9 * License as published by the Free Software Foundation; either
10 * version 2.1 of the License, or (at your option) any later version.
11 *
12 * Libav is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * Lesser General Public License for more details.
16 *
17 * You should have received a copy of the GNU Lesser General Public
18 * License along with Libav; if not, write to the Free Software
19 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
20 */
21
22 #include "libavutil/mathematics.h"
23 #include "libavcodec/avcodec.h"
24 #include "avformat.h"
25 #include "avio_internal.h"
26 #include "riff.h"
27 #include "libavcodec/bytestream.h"
28
29 /* Note: When encoding, the first matching tag is used, so order is
30 * important if multiple tags are possible for a given codec. */
31 const AVCodecTag ff_codec_bmp_tags[] = {
32 { AV_CODEC_ID_H264, MKTAG('H', '2', '6', '4') },
33 { AV_CODEC_ID_H264, MKTAG('h', '2', '6', '4') },
34 { AV_CODEC_ID_H264, MKTAG('X', '2', '6', '4') },
35 { AV_CODEC_ID_H264, MKTAG('x', '2', '6', '4') },
36 { AV_CODEC_ID_H264, MKTAG('a', 'v', 'c', '1') },
37 { AV_CODEC_ID_H264, MKTAG('D', 'A', 'V', 'C') },
38 { AV_CODEC_ID_H264, MKTAG('V', 'S', 'S', 'H') },
39 { AV_CODEC_ID_H263, MKTAG('H', '2', '6', '3') },
40 { AV_CODEC_ID_H263, MKTAG('X', '2', '6', '3') },
41 { AV_CODEC_ID_H263, MKTAG('T', '2', '6', '3') },
42 { AV_CODEC_ID_H263, MKTAG('L', '2', '6', '3') },
43 { AV_CODEC_ID_H263, MKTAG('V', 'X', '1', 'K') },
44 { AV_CODEC_ID_H263, MKTAG('Z', 'y', 'G', 'o') },
45 { AV_CODEC_ID_H263, MKTAG('M', '2', '6', '3') },
46 { AV_CODEC_ID_H263P, MKTAG('H', '2', '6', '3') },
47 { AV_CODEC_ID_H263I, MKTAG('I', '2', '6', '3') }, /* Intel H.263 */
48 { AV_CODEC_ID_H261, MKTAG('H', '2', '6', '1') },
49 { AV_CODEC_ID_H263P, MKTAG('U', '2', '6', '3') },
50 { AV_CODEC_ID_H263P, MKTAG('v', 'i', 'v', '1') },
51 { AV_CODEC_ID_MPEG4, MKTAG('F', 'M', 'P', '4') },
52 { AV_CODEC_ID_MPEG4, MKTAG('D', 'I', 'V', 'X') },
53 { AV_CODEC_ID_MPEG4, MKTAG('D', 'X', '5', '0') },
54 { AV_CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'D') },
55 { AV_CODEC_ID_MPEG4, MKTAG('M', 'P', '4', 'S') },
56 { AV_CODEC_ID_MPEG4, MKTAG('M', '4', 'S', '2') },
57 /* some broken AVIs use this */
58 { AV_CODEC_ID_MPEG4, MKTAG( 4 , 0 , 0 , 0 ) },
59 /* some broken AVIs use this */
60 { AV_CODEC_ID_MPEG4, MKTAG('Z', 'M', 'P', '4') },
61 { AV_CODEC_ID_MPEG4, MKTAG('D', 'I', 'V', '1') },
62 { AV_CODEC_ID_MPEG4, MKTAG('B', 'L', 'Z', '0') },
63 { AV_CODEC_ID_MPEG4, MKTAG('m', 'p', '4', 'v') },
64 { AV_CODEC_ID_MPEG4, MKTAG('U', 'M', 'P', '4') },
65 { AV_CODEC_ID_MPEG4, MKTAG('W', 'V', '1', 'F') },
66 { AV_CODEC_ID_MPEG4, MKTAG('S', 'E', 'D', 'G') },
67 { AV_CODEC_ID_MPEG4, MKTAG('R', 'M', 'P', '4') },
68 { AV_CODEC_ID_MPEG4, MKTAG('3', 'I', 'V', '2') },
69 /* WaWv MPEG-4 Video Codec */
70 { AV_CODEC_ID_MPEG4, MKTAG('W', 'A', 'W', 'V') },
71 { AV_CODEC_ID_MPEG4, MKTAG('F', 'F', 'D', 'S') },
72 { AV_CODEC_ID_MPEG4, MKTAG('F', 'V', 'F', 'W') },
73 { AV_CODEC_ID_MPEG4, MKTAG('D', 'C', 'O', 'D') },
74 { AV_CODEC_ID_MPEG4, MKTAG('M', 'V', 'X', 'M') },
75 { AV_CODEC_ID_MPEG4, MKTAG('P', 'M', '4', 'V') },
76 { AV_CODEC_ID_MPEG4, MKTAG('S', 'M', 'P', '4') },
77 { AV_CODEC_ID_MPEG4, MKTAG('D', 'X', 'G', 'M') },
78 { AV_CODEC_ID_MPEG4, MKTAG('V', 'I', 'D', 'M') },
79 { AV_CODEC_ID_MPEG4, MKTAG('M', '4', 'T', '3') },
80 { AV_CODEC_ID_MPEG4, MKTAG('G', 'E', 'O', 'X') },
81 /* flipped video */
82 { AV_CODEC_ID_MPEG4, MKTAG('H', 'D', 'X', '4') },
83 { AV_CODEC_ID_MPEG4, MKTAG('D', 'M', 'K', '2') },
84 { AV_CODEC_ID_MPEG4, MKTAG('D', 'I', 'G', 'I') },
85 { AV_CODEC_ID_MPEG4, MKTAG('I', 'N', 'M', 'C') },
86 /* Ephv MPEG-4 */
87 { AV_CODEC_ID_MPEG4, MKTAG('E', 'P', 'H', 'V') },
88 { AV_CODEC_ID_MPEG4, MKTAG('E', 'M', '4', 'A') },
89 /* Divio MPEG-4 */
90 { AV_CODEC_ID_MPEG4, MKTAG('M', '4', 'C', 'C') },
91 { AV_CODEC_ID_MPEG4, MKTAG('S', 'N', '4', '0') },
92 { AV_CODEC_ID_MPEG4, MKTAG('V', 'S', 'P', 'X') },
93 { AV_CODEC_ID_MPEG4, MKTAG('U', 'L', 'D', 'X') },
94 { AV_CODEC_ID_MPEG4, MKTAG('G', 'E', 'O', 'V') },
95 /* Samsung SHR-6040 */
96 { AV_CODEC_ID_MPEG4, MKTAG('S', 'I', 'P', 'P') },
97 { AV_CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'X') },
98 { AV_CODEC_ID_MPEG4, MKTAG('D', 'r', 'e', 'X') },
99 { AV_CODEC_ID_MSMPEG4V3, MKTAG('M', 'P', '4', '3') },
100 { AV_CODEC_ID_MSMPEG4V3, MKTAG('D', 'I', 'V', '3') },
101 { AV_CODEC_ID_MSMPEG4V3, MKTAG('M', 'P', 'G', '3') },
102 { AV_CODEC_ID_MSMPEG4V3, MKTAG('D', 'I', 'V', '5') },
103 { AV_CODEC_ID_MSMPEG4V3, MKTAG('D', 'I', 'V', '6') },
104 { AV_CODEC_ID_MSMPEG4V3, MKTAG('D', 'I', 'V', '4') },
105 { AV_CODEC_ID_MSMPEG4V3, MKTAG('D', 'V', 'X', '3') },
106 { AV_CODEC_ID_MSMPEG4V3, MKTAG('A', 'P', '4', '1') },
107 { AV_CODEC_ID_MSMPEG4V3, MKTAG('C', 'O', 'L', '1') },
108 { AV_CODEC_ID_MSMPEG4V3, MKTAG('C', 'O', 'L', '0') },
109 { AV_CODEC_ID_MSMPEG4V2, MKTAG('M', 'P', '4', '2') },
110 { AV_CODEC_ID_MSMPEG4V2, MKTAG('D', 'I', 'V', '2') },
111 { AV_CODEC_ID_MSMPEG4V1, MKTAG('M', 'P', 'G', '4') },
112 { AV_CODEC_ID_MSMPEG4V1, MKTAG('M', 'P', '4', '1') },
113 { AV_CODEC_ID_WMV1, MKTAG('W', 'M', 'V', '1') },
114 { AV_CODEC_ID_WMV2, MKTAG('W', 'M', 'V', '2') },
115 { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', 's', 'd') },
116 { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'h', 'd') },
117 { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'h', '1') },
118 { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', 's', 'l') },
119 { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', '2', '5') },
120 { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', '5', '0') },
121 /* Canopus DV */
122 { AV_CODEC_ID_DVVIDEO, MKTAG('c', 'd', 'v', 'c') },
123 /* Canopus DV */
124 { AV_CODEC_ID_DVVIDEO, MKTAG('C', 'D', 'V', 'H') },
125 /* Canopus DV */
126 { AV_CODEC_ID_DVVIDEO, MKTAG('C', 'D', 'V', '5') },
127 { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'c', ' ') },
128 { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'c', 's') },
129 { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'h', '1') },
130 { AV_CODEC_ID_MPEG1VIDEO, MKTAG('m', 'p', 'g', '1') },
131 { AV_CODEC_ID_MPEG1VIDEO, MKTAG('m', 'p', 'g', '2') },
132 { AV_CODEC_ID_MPEG2VIDEO, MKTAG('m', 'p', 'g', '2') },
133 { AV_CODEC_ID_MPEG2VIDEO, MKTAG('M', 'P', 'E', 'G') },
134 { AV_CODEC_ID_MPEG1VIDEO, MKTAG('P', 'I', 'M', '1') },
135 { AV_CODEC_ID_MPEG2VIDEO, MKTAG('P', 'I', 'M', '2') },
136 { AV_CODEC_ID_MPEG1VIDEO, MKTAG('V', 'C', 'R', '2') },
137 { AV_CODEC_ID_MPEG1VIDEO, MKTAG( 1 , 0 , 0 , 16) },
138 { AV_CODEC_ID_MPEG2VIDEO, MKTAG( 2 , 0 , 0 , 16) },
139 { AV_CODEC_ID_MPEG4, MKTAG( 4 , 0 , 0 , 16) },
140 { AV_CODEC_ID_MPEG2VIDEO, MKTAG('D', 'V', 'R', ' ') },
141 { AV_CODEC_ID_MPEG2VIDEO, MKTAG('M', 'M', 'E', 'S') },
142 /* Lead MPEG-2 in AVI */
143 { AV_CODEC_ID_MPEG2VIDEO, MKTAG('L', 'M', 'P', '2') },
144 { AV_CODEC_ID_MPEG2VIDEO, MKTAG('s', 'l', 'i', 'f') },
145 { AV_CODEC_ID_MPEG2VIDEO, MKTAG('E', 'M', '2', 'V') },
146 /* Matrox MPEG-2 intra-only */
147 { AV_CODEC_ID_MPEG2VIDEO, MKTAG('M', '7', '0', '1') },
148 { AV_CODEC_ID_MPEG2VIDEO, MKTAG('m', 'p', 'g', 'v') },
149 { AV_CODEC_ID_MJPEG, MKTAG('M', 'J', 'P', 'G') },
150 { AV_CODEC_ID_MJPEG, MKTAG('L', 'J', 'P', 'G') },
151 { AV_CODEC_ID_MJPEG, MKTAG('d', 'm', 'b', '1') },
152 { AV_CODEC_ID_MJPEG, MKTAG('m', 'j', 'p', 'a') },
153 { AV_CODEC_ID_LJPEG, MKTAG('L', 'J', 'P', 'G') },
154 /* Pegasus lossless JPEG */
155 { AV_CODEC_ID_MJPEG, MKTAG('J', 'P', 'G', 'L') },
156 /* JPEG-LS custom FOURCC for AVI - encoder */
157 { AV_CODEC_ID_JPEGLS, MKTAG('M', 'J', 'L', 'S') },
158 { AV_CODEC_ID_JPEGLS, MKTAG('M', 'J', 'P', 'G') },
159 /* JPEG-LS custom FOURCC for AVI - decoder */
160 { AV_CODEC_ID_MJPEG, MKTAG('M', 'J', 'L', 'S') },
161 { AV_CODEC_ID_MJPEG, MKTAG('j', 'p', 'e', 'g') },
162 { AV_CODEC_ID_MJPEG, MKTAG('I', 'J', 'P', 'G') },
163 { AV_CODEC_ID_MJPEG, MKTAG('A', 'V', 'R', 'n') },
164 { AV_CODEC_ID_MJPEG, MKTAG('A', 'C', 'D', 'V') },
165 { AV_CODEC_ID_MJPEG, MKTAG('Q', 'I', 'V', 'G') },
166 /* SL M-JPEG */
167 { AV_CODEC_ID_MJPEG, MKTAG('S', 'L', 'M', 'J') },
168 /* Creative Webcam JPEG */
169 { AV_CODEC_ID_MJPEG, MKTAG('C', 'J', 'P', 'G') },
170 /* Intel JPEG Library Video Codec */
171 { AV_CODEC_ID_MJPEG, MKTAG('I', 'J', 'L', 'V') },
172 /* Midvid JPEG Video Codec */
173 { AV_CODEC_ID_MJPEG, MKTAG('M', 'V', 'J', 'P') },
174 { AV_CODEC_ID_MJPEG, MKTAG('A', 'V', 'I', '1') },
175 { AV_CODEC_ID_MJPEG, MKTAG('A', 'V', 'I', '2') },
176 { AV_CODEC_ID_MJPEG, MKTAG('M', 'T', 'S', 'J') },
177 /* Paradigm Matrix M-JPEG Codec */
178 { AV_CODEC_ID_MJPEG, MKTAG('Z', 'J', 'P', 'G') },
179 { AV_CODEC_ID_MJPEG, MKTAG('M', 'M', 'J', 'P') },
180 { AV_CODEC_ID_HUFFYUV, MKTAG('H', 'F', 'Y', 'U') },
181 { AV_CODEC_ID_FFVHUFF, MKTAG('F', 'F', 'V', 'H') },
182 { AV_CODEC_ID_CYUV, MKTAG('C', 'Y', 'U', 'V') },
183 { AV_CODEC_ID_RAWVIDEO, MKTAG( 0 , 0 , 0 , 0 ) },
184 { AV_CODEC_ID_RAWVIDEO, MKTAG( 3 , 0 , 0 , 0 ) },
185 { AV_CODEC_ID_RAWVIDEO, MKTAG('I', '4', '2', '0') },
186 { AV_CODEC_ID_RAWVIDEO, MKTAG('Y', 'U', 'Y', '2') },
187 { AV_CODEC_ID_RAWVIDEO, MKTAG('Y', '4', '2', '2') },
188 { AV_CODEC_ID_RAWVIDEO, MKTAG('V', '4', '2', '2') },
189 { AV_CODEC_ID_RAWVIDEO, MKTAG('Y', 'U', 'N', 'V') },
190 { AV_CODEC_ID_RAWVIDEO, MKTAG('U', 'Y', 'N', 'V') },
191 { AV_CODEC_ID_RAWVIDEO, MKTAG('U', 'Y', 'N', 'Y') },
192 { AV_CODEC_ID_RAWVIDEO, MKTAG('u', 'y', 'v', '1') },
193 { AV_CODEC_ID_RAWVIDEO, MKTAG('2', 'V', 'u', '1') },
194 { AV_CODEC_ID_RAWVIDEO, MKTAG('2', 'v', 'u', 'y') },
195 { AV_CODEC_ID_RAWVIDEO, MKTAG('y', 'u', 'v', 's') },
196 { AV_CODEC_ID_RAWVIDEO, MKTAG('y', 'u', 'v', '2') },
197 { AV_CODEC_ID_RAWVIDEO, MKTAG('P', '4', '2', '2') },
198 { AV_CODEC_ID_RAWVIDEO, MKTAG('Y', 'V', '1', '2') },
199 { AV_CODEC_ID_RAWVIDEO, MKTAG('Y', 'V', '1', '6') },
200 { AV_CODEC_ID_RAWVIDEO, MKTAG('Y', 'V', '2', '4') },
201 { AV_CODEC_ID_RAWVIDEO, MKTAG('U', 'Y', 'V', 'Y') },
202 { AV_CODEC_ID_RAWVIDEO, MKTAG('V', 'Y', 'U', 'Y') },
203 { AV_CODEC_ID_RAWVIDEO, MKTAG('I', 'Y', 'U', 'V') },
204 { AV_CODEC_ID_RAWVIDEO, MKTAG('Y', '8', '0', '0') },
205 { AV_CODEC_ID_RAWVIDEO, MKTAG('Y', '8', ' ', ' ') },
206 { AV_CODEC_ID_RAWVIDEO, MKTAG('H', 'D', 'Y', 'C') },
207 { AV_CODEC_ID_RAWVIDEO, MKTAG('Y', 'V', 'U', '9') },
208 /* SoftLab-NSK VideoTizer */
209 { AV_CODEC_ID_RAWVIDEO, MKTAG('V', 'D', 'T', 'Z') },
210 { AV_CODEC_ID_RAWVIDEO, MKTAG('Y', '4', '1', '1') },
211 { AV_CODEC_ID_RAWVIDEO, MKTAG('N', 'V', '1', '2') },
212 { AV_CODEC_ID_RAWVIDEO, MKTAG('N', 'V', '2', '1') },
213 { AV_CODEC_ID_RAWVIDEO, MKTAG('Y', '4', '1', 'B') },
214 { AV_CODEC_ID_RAWVIDEO, MKTAG('Y', '4', '2', 'B') },
215 { AV_CODEC_ID_RAWVIDEO, MKTAG('Y', 'U', 'V', '9') },
216 { AV_CODEC_ID_RAWVIDEO, MKTAG('Y', 'V', 'U', '9') },
217 { AV_CODEC_ID_RAWVIDEO, MKTAG('a', 'u', 'v', '2') },
218 { AV_CODEC_ID_FRWU, MKTAG('F', 'R', 'W', 'U') },
219 { AV_CODEC_ID_R10K, MKTAG('R', '1', '0', 'k') },
220 { AV_CODEC_ID_R210, MKTAG('r', '2', '1', '0') },
221 { AV_CODEC_ID_V210, MKTAG('v', '2', '1', '0') },
222 { AV_CODEC_ID_V410, MKTAG('v', '4', '1', '0') },
223 { AV_CODEC_ID_INDEO3, MKTAG('I', 'V', '3', '1') },
224 { AV_CODEC_ID_INDEO3, MKTAG('I', 'V', '3', '2') },
225 { AV_CODEC_ID_INDEO4, MKTAG('I', 'V', '4', '1') },
226 { AV_CODEC_ID_INDEO5, MKTAG('I', 'V', '5', '0') },
227 { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
228 { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
229 { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') },
230 { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') },
231 { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') },
232 { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') },
233 { AV_CODEC_ID_VP6F, MKTAG('V', 'P', '6', 'F') },
234 { AV_CODEC_ID_VP6F, MKTAG('F', 'L', 'V', '4') },
235 { AV_CODEC_ID_VP8, MKTAG('V', 'P', '8', '0') },
236 { AV_CODEC_ID_ASV1, MKTAG('A', 'S', 'V', '1') },
237 { AV_CODEC_ID_ASV2, MKTAG('A', 'S', 'V', '2') },
238 { AV_CODEC_ID_VCR1, MKTAG('V', 'C', 'R', '1') },
239 { AV_CODEC_ID_FFV1, MKTAG('F', 'F', 'V', '1') },
240 { AV_CODEC_ID_XAN_WC4, MKTAG('X', 'x', 'a', 'n') },
241 { AV_CODEC_ID_MIMIC, MKTAG('L', 'M', '2', '0') },
242 { AV_CODEC_ID_MSRLE, MKTAG('m', 'r', 'l', 'e') },
243 { AV_CODEC_ID_MSRLE, MKTAG( 1 , 0 , 0 , 0 ) },
244 { AV_CODEC_ID_MSRLE, MKTAG( 2 , 0 , 0 , 0 ) },
245 { AV_CODEC_ID_MSVIDEO1, MKTAG('M', 'S', 'V', 'C') },
246 { AV_CODEC_ID_MSVIDEO1, MKTAG('m', 's', 'v', 'c') },
247 { AV_CODEC_ID_MSVIDEO1, MKTAG('C', 'R', 'A', 'M') },
248 { AV_CODEC_ID_MSVIDEO1, MKTAG('c', 'r', 'a', 'm') },
249 { AV_CODEC_ID_MSVIDEO1, MKTAG('W', 'H', 'A', 'M') },
250 { AV_CODEC_ID_MSVIDEO1, MKTAG('w', 'h', 'a', 'm') },
251 { AV_CODEC_ID_CINEPAK, MKTAG('c', 'v', 'i', 'd') },
252 { AV_CODEC_ID_TRUEMOTION1, MKTAG('D', 'U', 'C', 'K') },
253 { AV_CODEC_ID_TRUEMOTION1, MKTAG('P', 'V', 'E', 'Z') },
254 { AV_CODEC_ID_MSZH, MKTAG('M', 'S', 'Z', 'H') },
255 { AV_CODEC_ID_ZLIB, MKTAG('Z', 'L', 'I', 'B') },
256 { AV_CODEC_ID_4XM, MKTAG('4', 'X', 'M', 'V') },
257 { AV_CODEC_ID_FLV1, MKTAG('F', 'L', 'V', '1') },
258 { AV_CODEC_ID_FLASHSV, MKTAG('F', 'S', 'V', '1') },
259 { AV_CODEC_ID_SVQ1, MKTAG('s', 'v', 'q', '1') },
260 { AV_CODEC_ID_TSCC, MKTAG('t', 's', 'c', 'c') },
261 { AV_CODEC_ID_ULTI, MKTAG('U', 'L', 'T', 'I') },
262 { AV_CODEC_ID_VIXL, MKTAG('V', 'I', 'X', 'L') },
263 { AV_CODEC_ID_QPEG, MKTAG('Q', 'P', 'E', 'G') },
264 { AV_CODEC_ID_QPEG, MKTAG('Q', '1', '.', '0') },
265 { AV_CODEC_ID_QPEG, MKTAG('Q', '1', '.', '1') },
266 { AV_CODEC_ID_WMV3, MKTAG('W', 'M', 'V', '3') },
267 { AV_CODEC_ID_WMV3IMAGE, MKTAG('W', 'M', 'V', 'P') },
268 { AV_CODEC_ID_VC1, MKTAG('W', 'V', 'C', '1') },
269 { AV_CODEC_ID_VC1, MKTAG('W', 'M', 'V', 'A') },
270 { AV_CODEC_ID_VC1IMAGE, MKTAG('W', 'V', 'P', '2') },
271 { AV_CODEC_ID_LOCO, MKTAG('L', 'O', 'C', 'O') },
272 { AV_CODEC_ID_WNV1, MKTAG('W', 'N', 'V', '1') },
273 { AV_CODEC_ID_AASC, MKTAG('A', 'A', 'S', 'C') },
274 { AV_CODEC_ID_INDEO2, MKTAG('R', 'T', '2', '1') },
275 { AV_CODEC_ID_FRAPS, MKTAG('F', 'P', 'S', '1') },
276 { AV_CODEC_ID_THEORA, MKTAG('t', 'h', 'e', 'o') },
277 { AV_CODEC_ID_TRUEMOTION2, MKTAG('T', 'M', '2', '0') },
278 { AV_CODEC_ID_CSCD, MKTAG('C', 'S', 'C', 'D') },
279 { AV_CODEC_ID_ZMBV, MKTAG('Z', 'M', 'B', 'V') },
280 { AV_CODEC_ID_KMVC, MKTAG('K', 'M', 'V', 'C') },
281 { AV_CODEC_ID_CAVS, MKTAG('C', 'A', 'V', 'S') },
282 { AV_CODEC_ID_JPEG2000, MKTAG('m', 'j', 'p', '2') },
283 { AV_CODEC_ID_JPEG2000, MKTAG('M', 'J', '2', 'C') },
284 { AV_CODEC_ID_JPEG2000, MKTAG('L', 'J', '2', 'C') },
285 { AV_CODEC_ID_JPEG2000, MKTAG('L', 'J', '2', 'K') },
286 { AV_CODEC_ID_VMNC, MKTAG('V', 'M', 'n', 'c') },
287 { AV_CODEC_ID_TARGA, MKTAG('t', 'g', 'a', ' ') },
288 { AV_CODEC_ID_PNG, MKTAG('M', 'P', 'N', 'G') },
289 { AV_CODEC_ID_PNG, MKTAG('P', 'N', 'G', '1') },
290 { AV_CODEC_ID_CLJR, MKTAG('C', 'L', 'J', 'R') },
291 { AV_CODEC_ID_DIRAC, MKTAG('d', 'r', 'a', 'c') },
292 { AV_CODEC_ID_RPZA, MKTAG('a', 'z', 'p', 'r') },
293 { AV_CODEC_ID_RPZA, MKTAG('R', 'P', 'Z', 'A') },
294 { AV_CODEC_ID_RPZA, MKTAG('r', 'p', 'z', 'a') },
295 { AV_CODEC_ID_SP5X, MKTAG('S', 'P', '5', '4') },
296 { AV_CODEC_ID_AURA, MKTAG('A', 'U', 'R', 'A') },
297 { AV_CODEC_ID_AURA2, MKTAG('A', 'U', 'R', '2') },
298 { AV_CODEC_ID_DPX, MKTAG('d', 'p', 'x', ' ') },
299 { AV_CODEC_ID_KGV1, MKTAG('K', 'G', 'V', '1') },
300 { AV_CODEC_ID_LAGARITH, MKTAG('L', 'A', 'G', 'S') },
301 { AV_CODEC_ID_UTVIDEO, MKTAG('U', 'L', 'R', 'A') },
302 { AV_CODEC_ID_UTVIDEO, MKTAG('U', 'L', 'R', 'G') },
303 { AV_CODEC_ID_UTVIDEO, MKTAG('U', 'L', 'Y', '0') },
304 { AV_CODEC_ID_UTVIDEO, MKTAG('U', 'L', 'Y', '2') },
305 { AV_CODEC_ID_VBLE, MKTAG('V', 'B', 'L', 'E') },
306 { AV_CODEC_ID_DXTORY, MKTAG('x', 't', 'o', 'r') },
307 { AV_CODEC_ID_ZEROCODEC, MKTAG('Z', 'E', 'C', 'O') },
308 { AV_CODEC_ID_MSS1, MKTAG('M', 'S', 'S', '1') },
309 { AV_CODEC_ID_MSA1, MKTAG('M', 'S', 'A', '1') },
310 { AV_CODEC_ID_TSCC2, MKTAG('T', 'S', 'C', '2') },
311 { AV_CODEC_ID_MTS2, MKTAG('M', 'T', 'S', '2') },
312 { AV_CODEC_ID_CLLC, MKTAG('C', 'L', 'L', 'C') },
313 { AV_CODEC_ID_MSS2, MKTAG('M', 'S', 'S', '2') },
314 { AV_CODEC_ID_SVQ3, MKTAG('S', 'V', 'Q', '3') },
315 { AV_CODEC_ID_NONE, 0 }
316 };
317
318 const AVCodecTag ff_codec_wav_tags[] = {
319 { AV_CODEC_ID_PCM_S16LE, 0x0001 },
320 /* must come after s16le in this list */
321 { AV_CODEC_ID_PCM_U8, 0x0001 },
322 { AV_CODEC_ID_PCM_S24LE, 0x0001 },
323 { AV_CODEC_ID_PCM_S32LE, 0x0001 },
324 { AV_CODEC_ID_ADPCM_MS, 0x0002 },
325 { AV_CODEC_ID_PCM_F32LE, 0x0003 },
326 /* must come after f32le in this list */
327 { AV_CODEC_ID_PCM_F64LE, 0x0003 },
328 { AV_CODEC_ID_PCM_ALAW, 0x0006 },
329 { AV_CODEC_ID_PCM_MULAW, 0x0007 },
330 { AV_CODEC_ID_WMAVOICE, 0x000A },
331 { AV_CODEC_ID_ADPCM_IMA_WAV, 0x0011 },
332 /* must come after adpcm_ima_wav in this list */
333 { AV_CODEC_ID_PCM_ZORK, 0x0011 },
334 { AV_CODEC_ID_ADPCM_YAMAHA, 0x0020 },
335 { AV_CODEC_ID_TRUESPEECH, 0x0022 },
336 { AV_CODEC_ID_GSM_MS, 0x0031 },
337 { AV_CODEC_ID_ADPCM_G726, 0x0045 },
338 { AV_CODEC_ID_MP2, 0x0050 },
339 { AV_CODEC_ID_MP3, 0x0055 },
340 { AV_CODEC_ID_AMR_NB, 0x0057 },
341 { AV_CODEC_ID_AMR_WB, 0x0058 },
342 /* rogue format number */
343 { AV_CODEC_ID_ADPCM_IMA_DK4, 0x0061 },
344 /* rogue format number */
345 { AV_CODEC_ID_ADPCM_IMA_DK3, 0x0062 },
346 { AV_CODEC_ID_ADPCM_IMA_WAV, 0x0069 },
347 { AV_CODEC_ID_VOXWARE, 0x0075 },
348 { AV_CODEC_ID_AAC, 0x00ff },
349 { AV_CODEC_ID_SIPR, 0x0130 },
350 { AV_CODEC_ID_WMAV1, 0x0160 },
351 { AV_CODEC_ID_WMAV2, 0x0161 },
352 { AV_CODEC_ID_WMAPRO, 0x0162 },
353 { AV_CODEC_ID_WMALOSSLESS, 0x0163 },
354 { AV_CODEC_ID_ADPCM_CT, 0x0200 },
355 { AV_CODEC_ID_ATRAC3, 0x0270 },
356 { AV_CODEC_ID_ADPCM_G722, 0x028F },
357 { AV_CODEC_ID_IMC, 0x0401 },
358 { AV_CODEC_ID_IAC, 0x0402 },
359 { AV_CODEC_ID_GSM_MS, 0x1500 },
360 { AV_CODEC_ID_TRUESPEECH, 0x1501 },
361 /* ADTS AAC */
362 { AV_CODEC_ID_AAC, 0x1600 },
363 { AV_CODEC_ID_AAC_LATM, 0x1602 },
364 { AV_CODEC_ID_AC3, 0x2000 },
365 { AV_CODEC_ID_DTS, 0x2001 },
366 { AV_CODEC_ID_PCM_MULAW, 0x6c75 },
367 { AV_CODEC_ID_AAC, 0x706d },
368 { AV_CODEC_ID_AAC, 0x4143 },
369 { AV_CODEC_ID_SPEEX, 0xA109 },
370 { AV_CODEC_ID_FLAC, 0xF1AC },
371 { AV_CODEC_ID_ADPCM_SWF, ('S' << 8) + 'F' },
372 /* HACK/FIXME: Does Vorbis in WAV/AVI have an (in)official ID? */
373 { AV_CODEC_ID_VORBIS, ('V' << 8) + 'o' },
374 { AV_CODEC_ID_NONE, 0 },
375 };
376
377 const AVMetadataConv ff_riff_info_conv[] = {
378 { "IART", "artist" },
379 { "ICMT", "comment" },
380 { "ICOP", "copyright" },
381 { "ICRD", "date" },
382 { "IGNR", "genre" },
383 { "ILNG", "language" },
384 { "INAM", "title" },
385 { "IPRD", "album" },
386 { "IPRT", "track" },
387 { "ISFT", "encoder" },
388 { "ITCH", "encoded_by" },
389 { 0 },
390 };
391
392 #if CONFIG_MUXERS
393 int64_t ff_start_tag(AVIOContext *pb, const char *tag)
394 {
395 ffio_wfourcc(pb, tag);
396 avio_wl32(pb, 0);
397 return avio_tell(pb);
398 }
399
400 void ff_end_tag(AVIOContext *pb, int64_t start)
401 {
402 int64_t pos;
403
404 pos = avio_tell(pb);
405 avio_seek(pb, start - 4, SEEK_SET);
406 avio_wl32(pb, (uint32_t)(pos - start));
407 avio_seek(pb, pos, SEEK_SET);
408 }
409
410 /* WAVEFORMATEX header */
411 /* returns the size or -1 on error */
412 int ff_put_wav_header(AVIOContext *pb, AVCodecContext *enc)
413 {
414 int bps, blkalign, bytespersec, frame_size;
415 int hdrsize = 18;
416 int waveformatextensible;
417 uint8_t temp[256];
418 uint8_t *riff_extradata = temp;
419 uint8_t *riff_extradata_start = temp;
420
421 if (!enc->codec_tag || enc->codec_tag > 0xffff)
422 return -1;
423
424 /* We use the known constant frame size for the codec if known, otherwise
425 * fall back on using AVCodecContext.frame_size, which is not as reliable
426 * for indicating packet duration. */
427 frame_size = av_get_audio_frame_duration(enc, 0);
428 if (!frame_size)
429 frame_size = enc->frame_size;
430
431 waveformatextensible = (enc->channels > 2 && enc->channel_layout) ||
432 enc->sample_rate > 48000 ||
433 av_get_bits_per_sample(enc->codec_id) > 16;
434
435 if (waveformatextensible)
436 avio_wl16(pb, 0xfffe);
437 else
438 avio_wl16(pb, enc->codec_tag);
439
440 avio_wl16(pb, enc->channels);
441 avio_wl32(pb, enc->sample_rate);
442 if (enc->codec_id == AV_CODEC_ID_MP2 ||
443 enc->codec_id == AV_CODEC_ID_MP3 ||
444 enc->codec_id == AV_CODEC_ID_GSM_MS) {
445 bps = 0;
446 } else {
447 if (!(bps = av_get_bits_per_sample(enc->codec_id))) {
448 if (enc->bits_per_coded_sample)
449 bps = enc->bits_per_coded_sample;
450 else
451 bps = 16; // default to 16
452 }
453 }
454 if (bps != enc->bits_per_coded_sample && enc->bits_per_coded_sample) {
455 av_log(enc, AV_LOG_WARNING,
456 "requested bits_per_coded_sample (%d) "
457 "and actually stored (%d) differ\n",
458 enc->bits_per_coded_sample, bps);
459 }
460
461 if (enc->codec_id == AV_CODEC_ID_MP2 ||
462 enc->codec_id == AV_CODEC_ID_MP3) {
463 /* This is wrong, but it seems many demuxers do not work if this
464 * is set correctly. */
465 blkalign = frame_size;
466 // blkalign = 144 * enc->bit_rate/enc->sample_rate;
467 } else if (enc->codec_id == AV_CODEC_ID_AC3) {
468 blkalign = 3840; /* maximum bytes per frame */
469 } else if (enc->block_align != 0) { /* specified by the codec */
470 blkalign = enc->block_align;
471 } else
472 blkalign = bps * enc->channels / av_gcd(8, bps);
473 if (enc->codec_id == AV_CODEC_ID_PCM_U8 ||
474 enc->codec_id == AV_CODEC_ID_PCM_S24LE ||
475 enc->codec_id == AV_CODEC_ID_PCM_S32LE ||
476 enc->codec_id == AV_CODEC_ID_PCM_F32LE ||
477 enc->codec_id == AV_CODEC_ID_PCM_F64LE ||
478 enc->codec_id == AV_CODEC_ID_PCM_S16LE) {
479 bytespersec = enc->sample_rate * blkalign;
480 } else {
481 bytespersec = enc->bit_rate / 8;
482 }
483 avio_wl32(pb, bytespersec); /* bytes per second */
484 avio_wl16(pb, blkalign); /* block align */
485 avio_wl16(pb, bps); /* bits per sample */
486 if (enc->codec_id == AV_CODEC_ID_MP3) {
487 hdrsize += 12;
488 bytestream_put_le16(&riff_extradata, 1); /* wID */
489 bytestream_put_le32(&riff_extradata, 2); /* fdwFlags */
490 bytestream_put_le16(&riff_extradata, 1152); /* nBlockSize */
491 bytestream_put_le16(&riff_extradata, 1); /* nFramesPerBlock */
492 bytestream_put_le16(&riff_extradata, 1393); /* nCodecDelay */
493 } else if (enc->codec_id == AV_CODEC_ID_MP2) {
494 hdrsize += 22;
495 /* fwHeadLayer */
496 bytestream_put_le16(&riff_extradata, 2);
497 /* dwHeadBitrate */
498 bytestream_put_le32(&riff_extradata, enc->bit_rate);
499 /* fwHeadMode */
500 bytestream_put_le16(&riff_extradata, enc->channels == 2 ? 1 : 8);
501 /* fwHeadModeExt */
502 bytestream_put_le16(&riff_extradata, 0);
503 /* wHeadEmphasis */
504 bytestream_put_le16(&riff_extradata, 1);
505 /* fwHeadFlags */
506 bytestream_put_le16(&riff_extradata, 16);
507 /* dwPTSLow */
508 bytestream_put_le32(&riff_extradata, 0);
509 /* dwPTSHigh */
510 bytestream_put_le32(&riff_extradata, 0);
511 } else if (enc->codec_id == AV_CODEC_ID_GSM_MS ||
512 enc->codec_id == AV_CODEC_ID_ADPCM_IMA_WAV) {
513 hdrsize += 2;
514 /* wSamplesPerBlock */
515 bytestream_put_le16(&riff_extradata, frame_size);
516 } else if (enc->extradata_size) {
517 riff_extradata_start = enc->extradata;
518 riff_extradata = enc->extradata + enc->extradata_size;
519 hdrsize += enc->extradata_size;
520 }
521 /* write WAVEFORMATEXTENSIBLE extensions */
522 if (waveformatextensible) {
523 hdrsize += 22;
524 /* 22 is WAVEFORMATEXTENSIBLE size */
525 avio_wl16(pb, riff_extradata - riff_extradata_start + 22);
526 /* ValidBitsPerSample || SamplesPerBlock || Reserved */
527 avio_wl16(pb, bps);
528 /* dwChannelMask */
529 avio_wl32(pb, enc->channel_layout);
530 /* GUID + next 3 */
531 avio_wl32(pb, enc->codec_tag);
532 avio_wl32(pb, 0x00100000);
533 avio_wl32(pb, 0xAA000080);
534 avio_wl32(pb, 0x719B3800);
535 } else {
536 avio_wl16(pb, riff_extradata - riff_extradata_start); /* cbSize */
537 }
538 avio_write(pb, riff_extradata_start, riff_extradata - riff_extradata_start);
539 if (hdrsize & 1) {
540 hdrsize++;
541 avio_w8(pb, 0);
542 }
543
544 return hdrsize;
545 }
546
547 /* BITMAPINFOHEADER header */
548 void ff_put_bmp_header(AVIOContext *pb, AVCodecContext *enc,
549 const AVCodecTag *tags, int for_asf)
550 {
551 /* size */
552 avio_wl32(pb, 40 + enc->extradata_size);
553 avio_wl32(pb, enc->width);
554 //We always store RGB TopDown
555 avio_wl32(pb, enc->codec_tag ? enc->height : -enc->height);
556 /* planes */
557 avio_wl16(pb, 1);
558 /* depth */
559 avio_wl16(pb, enc->bits_per_coded_sample ? enc->bits_per_coded_sample : 24);
560 /* compression type */
561 avio_wl32(pb, enc->codec_tag);
562 avio_wl32(pb, enc->width * enc->height * 3);
563 avio_wl32(pb, 0);
564 avio_wl32(pb, 0);
565 avio_wl32(pb, 0);
566 avio_wl32(pb, 0);
567
568 avio_write(pb, enc->extradata, enc->extradata_size);
569
570 if (!for_asf && enc->extradata_size & 1)
571 avio_w8(pb, 0);
572 }
573
574 void ff_parse_specific_params(AVCodecContext *stream, int *au_rate,
575 int *au_ssize, int *au_scale)
576 {
577 int gcd;
578 int audio_frame_size;
579
580 /* We use the known constant frame size for the codec if known, otherwise
581 * fall back on using AVCodecContext.frame_size, which is not as reliable
582 * for indicating packet duration. */
583 audio_frame_size = av_get_audio_frame_duration(stream, 0);
584 if (!audio_frame_size)
585 audio_frame_size = stream->frame_size;
586
587 *au_ssize = stream->block_align;
588 if (audio_frame_size && stream->sample_rate) {
589 *au_scale = audio_frame_size;
590 *au_rate = stream->sample_rate;
591 } else if (stream->codec_type == AVMEDIA_TYPE_VIDEO ||
592 stream->codec_type == AVMEDIA_TYPE_DATA ||
593 stream->codec_type == AVMEDIA_TYPE_SUBTITLE) {
594 *au_scale = stream->time_base.num;
595 *au_rate = stream->time_base.den;
596 } else {
597 *au_scale = stream->block_align ? stream->block_align * 8 : 8;
598 *au_rate = stream->bit_rate ? stream->bit_rate :
599 8 * stream->sample_rate;
600 }
601 gcd = av_gcd(*au_scale, *au_rate);
602 *au_scale /= gcd;
603 *au_rate /= gcd;
604 }
605
606 void ff_riff_write_info_tag(AVIOContext *pb, const char *tag, const char *str)
607 {
608 int len = strlen(str);
609 if (len > 0) {
610 len++;
611 ffio_wfourcc(pb, tag);
612 avio_wl32(pb, len);
613 avio_put_str(pb, str);
614 if (len & 1)
615 avio_w8(pb, 0);
616 }
617 }
618
619 static const char riff_tags[][5] = {
620 "IARL", "IART", "ICMS", "ICMT", "ICOP", "ICRD", "ICRP", "IDIM", "IDPI",
621 "IENG", "IGNR", "IKEY", "ILGT", "ILNG", "IMED", "INAM", "IPLT", "IPRD",
622 "IPRT", "ISBJ", "ISFT", "ISHP", "ISRC", "ISRF", "ITCH",
623 { 0 }
624 };
625
626 static int riff_has_valid_tags(AVFormatContext *s)
627 {
628 int i;
629
630 for (i = 0; *riff_tags[i]; i++)
631 if (av_dict_get(s->metadata, riff_tags[i], NULL, AV_DICT_MATCH_CASE))
632 return 1;
633
634 return 0;
635 }
636
637 void ff_riff_write_info(AVFormatContext *s)
638 {
639 AVIOContext *pb = s->pb;
640 int i;
641 int64_t list_pos;
642 AVDictionaryEntry *t = NULL;
643
644 ff_metadata_conv(&s->metadata, ff_riff_info_conv, NULL);
645
646 /* writing empty LIST is not nice and may cause problems */
647 if (!riff_has_valid_tags(s))
648 return;
649
650 list_pos = ff_start_tag(pb, "LIST");
651 ffio_wfourcc(pb, "INFO");
652 for (i = 0; *riff_tags[i]; i++)
653 if ((t = av_dict_get(s->metadata, riff_tags[i],
654 NULL, AV_DICT_MATCH_CASE)))
655 ff_riff_write_info_tag(s->pb, t->key, t->value);
656 ff_end_tag(pb, list_pos);
657 }
658 #endif /* CONFIG_MUXERS */
659
660 #if CONFIG_DEMUXERS
661 /* We could be given one of the three possible structures here:
662 * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
663 * is an expansion of the previous one with the fields added
664 * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
665 * WAVEFORMATEX adds 'WORD cbSize' and basically makes itself
666 * an openended structure.
667 */
668 int ff_get_wav_header(AVIOContext *pb, AVCodecContext *codec, int size)
669 {
670 int id;
671
672 id = avio_rl16(pb);
673 codec->codec_type = AVMEDIA_TYPE_AUDIO;
674 codec->codec_tag = id;
675 codec->channels = avio_rl16(pb);
676 codec->sample_rate = avio_rl32(pb);
677 codec->bit_rate = avio_rl32(pb) * 8;
678 codec->block_align = avio_rl16(pb);
679 if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
680 codec->bits_per_coded_sample = 8;
681 } else
682 codec->bits_per_coded_sample = avio_rl16(pb);
683 if (size >= 18) { /* We're obviously dealing with WAVEFORMATEX */
684 int cbSize = avio_rl16(pb); /* cbSize */
685 size -= 18;
686 cbSize = FFMIN(size, cbSize);
687 if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
688 codec->bits_per_coded_sample = avio_rl16(pb);
689 codec->channel_layout = avio_rl32(pb); /* dwChannelMask */
690 id = avio_rl32(pb); /* 4 first bytes of GUID */
691 avio_skip(pb, 12); /* skip end of GUID */
692 cbSize -= 22;
693 size -= 22;
694 }
695 codec->extradata_size = cbSize;
696 if (cbSize > 0) {
697 av_free(codec->extradata);
698 codec->extradata = av_mallocz(codec->extradata_size +
699 FF_INPUT_BUFFER_PADDING_SIZE);
700 if (!codec->extradata)
701 return AVERROR(ENOMEM);
702 avio_read(pb, codec->extradata, codec->extradata_size);
703 size -= cbSize;
704 }
705
706 /* It is possible for the chunk to contain garbage at the end */
707 if (size > 0)
708 avio_skip(pb, size);
709 }
710 codec->codec_id = ff_wav_codec_get_id(id, codec->bits_per_coded_sample);
711 if (codec->codec_id == AV_CODEC_ID_AAC_LATM) {
712 /* Channels and sample_rate values are those prior to applying SBR
713 * and/or PS. */
714 codec->channels = 0;
715 codec->sample_rate = 0;
716 }
717 /* override bits_per_coded_sample for G.726 */
718 if (codec->codec_id == AV_CODEC_ID_ADPCM_G726)
719 codec->bits_per_coded_sample = codec->bit_rate / codec->sample_rate;
720
721 return 0;
722 }
723
724 enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
725 {
726 enum AVCodecID id;
727 id = ff_codec_get_id(ff_codec_wav_tags, tag);
728 if (id <= 0)
729 return id;
730
731 if (id == AV_CODEC_ID_PCM_S16LE)
732 id = ff_get_pcm_codec_id(bps, 0, 0, ~1);
733 else if (id == AV_CODEC_ID_PCM_F32LE)
734 id = ff_get_pcm_codec_id(bps, 1, 0, 0);
735
736 if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8)
737 id = AV_CODEC_ID_PCM_ZORK;
738 return id;
739 }
740
741 int ff_get_bmp_header(AVIOContext *pb, AVStream *st)
742 {
743 int tag1;
744 avio_rl32(pb); /* size */
745 st->codec->width = avio_rl32(pb);
746 st->codec->height = (int32_t)avio_rl32(pb);
747 avio_rl16(pb); /* planes */
748 st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */
749 tag1 = avio_rl32(pb);
750 avio_rl32(pb); /* ImageSize */
751 avio_rl32(pb); /* XPelsPerMeter */
752 avio_rl32(pb); /* YPelsPerMeter */
753 avio_rl32(pb); /* ClrUsed */
754 avio_rl32(pb); /* ClrImportant */
755 return tag1;
756 }
757
758 int ff_read_riff_info(AVFormatContext *s, int64_t size)
759 {
760 int64_t start, end, cur;
761 AVIOContext *pb = s->pb;
762
763 start = avio_tell(pb);
764 end = start + size;
765
766 while ((cur = avio_tell(pb)) >= 0 &&
767 cur <= end - 8 /* = tag + size */) {
768 uint32_t chunk_code;
769 int64_t chunk_size;
770 char key[5] = { 0 };
771 char *value;
772
773 chunk_code = avio_rl32(pb);
774 chunk_size = avio_rl32(pb);
775
776 if (chunk_size > end ||
777 end - chunk_size < cur ||
778 chunk_size == UINT_MAX) {
779 av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n");
780 break;
781 }
782
783 chunk_size += (chunk_size & 1);
784
785 if (!chunk_code) {
786 if (chunk_size)
787 avio_skip(pb, chunk_size);
788 else if (pb->eof_reached) {
789 av_log(s, AV_LOG_WARNING, "truncated file\n");
790 return AVERROR_EOF;
791 }
792 continue;
793 }
794
795 value = av_malloc(chunk_size + 1);
796 if (!value) {
797 av_log(s, AV_LOG_ERROR,
798 "out of memory, unable to read INFO tag\n");
799 return AVERROR(ENOMEM);
800 }
801
802 AV_WL32(key, chunk_code);
803
804 if (avio_read(pb, value, chunk_size) != chunk_size) {
805 av_free(value);
806 av_log(s, AV_LOG_WARNING,
807 "premature end of file while reading INFO tag\n");
808 break;
809 }
810
811 value[chunk_size] = 0;
812
813 av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
814 }
815
816 return 0;
817 }
818 #endif /* CONFIG_DEMUXERS */