riff.c
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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 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 h263 */
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  { AV_CODEC_ID_MPEG4, MKTAG( 4 , 0 , 0 , 0 ) }, /* some broken avi use this */
58  { AV_CODEC_ID_MPEG4, MKTAG('D', 'I', 'V', '1') },
59  { AV_CODEC_ID_MPEG4, MKTAG('B', 'L', 'Z', '0') },
60  { AV_CODEC_ID_MPEG4, MKTAG('m', 'p', '4', 'v') },
61  { AV_CODEC_ID_MPEG4, MKTAG('U', 'M', 'P', '4') },
62  { AV_CODEC_ID_MPEG4, MKTAG('W', 'V', '1', 'F') },
63  { AV_CODEC_ID_MPEG4, MKTAG('S', 'E', 'D', 'G') },
64  { AV_CODEC_ID_MPEG4, MKTAG('R', 'M', 'P', '4') },
65  { AV_CODEC_ID_MPEG4, MKTAG('3', 'I', 'V', '2') },
66  { AV_CODEC_ID_MPEG4, MKTAG('W', 'A', 'W', 'V') }, /* WaWv MPEG-4 Video Codec */
67  { AV_CODEC_ID_MPEG4, MKTAG('F', 'F', 'D', 'S') },
68  { AV_CODEC_ID_MPEG4, MKTAG('F', 'V', 'F', 'W') },
69  { AV_CODEC_ID_MPEG4, MKTAG('D', 'C', 'O', 'D') },
70  { AV_CODEC_ID_MPEG4, MKTAG('M', 'V', 'X', 'M') },
71  { AV_CODEC_ID_MPEG4, MKTAG('P', 'M', '4', 'V') },
72  { AV_CODEC_ID_MPEG4, MKTAG('S', 'M', 'P', '4') },
73  { AV_CODEC_ID_MPEG4, MKTAG('D', 'X', 'G', 'M') },
74  { AV_CODEC_ID_MPEG4, MKTAG('V', 'I', 'D', 'M') },
75  { AV_CODEC_ID_MPEG4, MKTAG('M', '4', 'T', '3') },
76  { AV_CODEC_ID_MPEG4, MKTAG('G', 'E', 'O', 'X') },
77  { AV_CODEC_ID_MPEG4, MKTAG('H', 'D', 'X', '4') }, /* flipped video */
78  { AV_CODEC_ID_MPEG4, MKTAG('D', 'M', 'K', '2') },
79  { AV_CODEC_ID_MPEG4, MKTAG('D', 'I', 'G', 'I') },
80  { AV_CODEC_ID_MPEG4, MKTAG('I', 'N', 'M', 'C') },
81  { AV_CODEC_ID_MPEG4, MKTAG('E', 'P', 'H', 'V') }, /* Ephv MPEG-4 */
82  { AV_CODEC_ID_MPEG4, MKTAG('E', 'M', '4', 'A') },
83  { AV_CODEC_ID_MPEG4, MKTAG('M', '4', 'C', 'C') }, /* Divio MPEG-4 */
84  { AV_CODEC_ID_MPEG4, MKTAG('S', 'N', '4', '0') },
85  { AV_CODEC_ID_MPEG4, MKTAG('V', 'S', 'P', 'X') },
86  { AV_CODEC_ID_MPEG4, MKTAG('U', 'L', 'D', 'X') },
87  { AV_CODEC_ID_MPEG4, MKTAG('G', 'E', 'O', 'V') },
88  { AV_CODEC_ID_MPEG4, MKTAG('S', 'I', 'P', 'P') }, /* Samsung SHR-6040 */
89  { AV_CODEC_ID_MPEG4, MKTAG('X', 'V', 'I', 'X') },
90  { AV_CODEC_ID_MPEG4, MKTAG('D', 'r', 'e', 'X') },
91  { AV_CODEC_ID_MSMPEG4V3, MKTAG('M', 'P', '4', '3') },
92  { AV_CODEC_ID_MSMPEG4V3, MKTAG('D', 'I', 'V', '3') },
93  { AV_CODEC_ID_MSMPEG4V3, MKTAG('M', 'P', 'G', '3') },
94  { AV_CODEC_ID_MSMPEG4V3, MKTAG('D', 'I', 'V', '5') },
95  { AV_CODEC_ID_MSMPEG4V3, MKTAG('D', 'I', 'V', '6') },
96  { AV_CODEC_ID_MSMPEG4V3, MKTAG('D', 'I', 'V', '4') },
97  { AV_CODEC_ID_MSMPEG4V3, MKTAG('D', 'V', 'X', '3') },
98  { AV_CODEC_ID_MSMPEG4V3, MKTAG('A', 'P', '4', '1') },
99  { AV_CODEC_ID_MSMPEG4V3, MKTAG('C', 'O', 'L', '1') },
100  { AV_CODEC_ID_MSMPEG4V3, MKTAG('C', 'O', 'L', '0') },
101  { AV_CODEC_ID_MSMPEG4V2, MKTAG('M', 'P', '4', '2') },
102  { AV_CODEC_ID_MSMPEG4V2, MKTAG('D', 'I', 'V', '2') },
103  { AV_CODEC_ID_MSMPEG4V1, MKTAG('M', 'P', 'G', '4') },
104  { AV_CODEC_ID_MSMPEG4V1, MKTAG('M', 'P', '4', '1') },
105  { AV_CODEC_ID_WMV1, MKTAG('W', 'M', 'V', '1') },
106  { AV_CODEC_ID_WMV2, MKTAG('W', 'M', 'V', '2') },
107  { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', 's', 'd') },
108  { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'h', 'd') },
109  { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'h', '1') },
110  { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', 's', 'l') },
111  { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', '2', '5') },
112  { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', '5', '0') },
113  { AV_CODEC_ID_DVVIDEO, MKTAG('c', 'd', 'v', 'c') }, /* Canopus DV */
114  { AV_CODEC_ID_DVVIDEO, MKTAG('C', 'D', 'V', 'H') }, /* Canopus DV */
115  { AV_CODEC_ID_DVVIDEO, MKTAG('C', 'D', 'V', '5') }, /* Canopus DV */
116  { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'c', ' ') },
117  { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'c', 's') },
118  { AV_CODEC_ID_DVVIDEO, MKTAG('d', 'v', 'h', '1') },
119  { AV_CODEC_ID_MPEG1VIDEO, MKTAG('m', 'p', 'g', '1') },
120  { AV_CODEC_ID_MPEG1VIDEO, MKTAG('m', 'p', 'g', '2') },
121  { AV_CODEC_ID_MPEG2VIDEO, MKTAG('m', 'p', 'g', '2') },
122  { AV_CODEC_ID_MPEG2VIDEO, MKTAG('M', 'P', 'E', 'G') },
123  { AV_CODEC_ID_MPEG1VIDEO, MKTAG('P', 'I', 'M', '1') },
124  { AV_CODEC_ID_MPEG2VIDEO, MKTAG('P', 'I', 'M', '2') },
125  { AV_CODEC_ID_MPEG1VIDEO, MKTAG('V', 'C', 'R', '2') },
126  { AV_CODEC_ID_MPEG1VIDEO, MKTAG( 1 , 0 , 0 , 16) },
127  { AV_CODEC_ID_MPEG2VIDEO, MKTAG( 2 , 0 , 0 , 16) },
128  { AV_CODEC_ID_MPEG4, MKTAG( 4 , 0 , 0 , 16) },
129  { AV_CODEC_ID_MPEG2VIDEO, MKTAG('D', 'V', 'R', ' ') },
130  { AV_CODEC_ID_MPEG2VIDEO, MKTAG('M', 'M', 'E', 'S') },
131  { AV_CODEC_ID_MPEG2VIDEO, MKTAG('L', 'M', 'P', '2') }, /* Lead MPEG2 in avi */
132  { AV_CODEC_ID_MPEG2VIDEO, MKTAG('s', 'l', 'i', 'f') },
133  { AV_CODEC_ID_MPEG2VIDEO, MKTAG('E', 'M', '2', 'V') },
134  { AV_CODEC_ID_MPEG2VIDEO, MKTAG('M', '7', '0', '1') }, /* Matrox MPEG2 intra-only */
135  { AV_CODEC_ID_MPEG2VIDEO, MKTAG('m', 'p', 'g', 'v') },
136  { AV_CODEC_ID_MJPEG, MKTAG('M', 'J', 'P', 'G') },
137  { AV_CODEC_ID_MJPEG, MKTAG('L', 'J', 'P', 'G') },
138  { AV_CODEC_ID_MJPEG, MKTAG('d', 'm', 'b', '1') },
139  { AV_CODEC_ID_MJPEG, MKTAG('m', 'j', 'p', 'a') },
140  { AV_CODEC_ID_LJPEG, MKTAG('L', 'J', 'P', 'G') },
141  { AV_CODEC_ID_MJPEG, MKTAG('J', 'P', 'G', 'L') }, /* Pegasus lossless JPEG */
142  { AV_CODEC_ID_JPEGLS, MKTAG('M', 'J', 'L', 'S') }, /* JPEG-LS custom FOURCC for avi - encoder */
143  { AV_CODEC_ID_JPEGLS, MKTAG('M', 'J', 'P', 'G') },
144  { AV_CODEC_ID_MJPEG, MKTAG('M', 'J', 'L', 'S') }, /* JPEG-LS custom FOURCC for avi - decoder */
145  { AV_CODEC_ID_MJPEG, MKTAG('j', 'p', 'e', 'g') },
146  { AV_CODEC_ID_MJPEG, MKTAG('I', 'J', 'P', 'G') },
147  { AV_CODEC_ID_MJPEG, MKTAG('A', 'V', 'R', 'n') },
148  { AV_CODEC_ID_MJPEG, MKTAG('A', 'C', 'D', 'V') },
149  { AV_CODEC_ID_MJPEG, MKTAG('Q', 'I', 'V', 'G') },
150  { AV_CODEC_ID_MJPEG, MKTAG('S', 'L', 'M', 'J') }, /* SL M-JPEG */
151  { AV_CODEC_ID_MJPEG, MKTAG('C', 'J', 'P', 'G') }, /* Creative Webcam JPEG */
152  { AV_CODEC_ID_MJPEG, MKTAG('I', 'J', 'L', 'V') }, /* Intel JPEG Library Video Codec */
153  { AV_CODEC_ID_MJPEG, MKTAG('M', 'V', 'J', 'P') }, /* Midvid JPEG Video Codec */
154  { AV_CODEC_ID_MJPEG, MKTAG('A', 'V', 'I', '1') },
155  { AV_CODEC_ID_MJPEG, MKTAG('A', 'V', 'I', '2') },
156  { AV_CODEC_ID_MJPEG, MKTAG('M', 'T', 'S', 'J') },
157  { AV_CODEC_ID_MJPEG, MKTAG('Z', 'J', 'P', 'G') }, /* Paradigm Matrix M-JPEG Codec */
158  { AV_CODEC_ID_MJPEG, MKTAG('M', 'M', 'J', 'P') },
159  { AV_CODEC_ID_HUFFYUV, MKTAG('H', 'F', 'Y', 'U') },
160  { AV_CODEC_ID_FFVHUFF, MKTAG('F', 'F', 'V', 'H') },
161  { AV_CODEC_ID_CYUV, MKTAG('C', 'Y', 'U', 'V') },
162  { AV_CODEC_ID_RAWVIDEO, MKTAG( 0 , 0 , 0 , 0 ) },
163  { AV_CODEC_ID_RAWVIDEO, MKTAG( 3 , 0 , 0 , 0 ) },
164  { AV_CODEC_ID_RAWVIDEO, MKTAG('I', '4', '2', '0') },
165  { AV_CODEC_ID_RAWVIDEO, MKTAG('Y', 'U', 'Y', '2') },
166  { AV_CODEC_ID_RAWVIDEO, MKTAG('Y', '4', '2', '2') },
167  { AV_CODEC_ID_RAWVIDEO, MKTAG('V', '4', '2', '2') },
168  { AV_CODEC_ID_RAWVIDEO, MKTAG('Y', 'U', 'N', 'V') },
169  { AV_CODEC_ID_RAWVIDEO, MKTAG('U', 'Y', 'N', 'V') },
170  { AV_CODEC_ID_RAWVIDEO, MKTAG('U', 'Y', 'N', 'Y') },
171  { AV_CODEC_ID_RAWVIDEO, MKTAG('u', 'y', 'v', '1') },
172  { AV_CODEC_ID_RAWVIDEO, MKTAG('2', 'V', 'u', '1') },
173  { AV_CODEC_ID_RAWVIDEO, MKTAG('2', 'v', 'u', 'y') },
174  { AV_CODEC_ID_RAWVIDEO, MKTAG('y', 'u', 'v', 's') },
175  { AV_CODEC_ID_RAWVIDEO, MKTAG('y', 'u', 'v', '2') },
176  { AV_CODEC_ID_RAWVIDEO, MKTAG('P', '4', '2', '2') },
177  { AV_CODEC_ID_RAWVIDEO, MKTAG('Y', 'V', '1', '2') },
178  { AV_CODEC_ID_RAWVIDEO, MKTAG('Y', 'V', '1', '6') },
179  { AV_CODEC_ID_RAWVIDEO, MKTAG('Y', 'V', '2', '4') },
180  { AV_CODEC_ID_RAWVIDEO, MKTAG('U', 'Y', 'V', 'Y') },
181  { AV_CODEC_ID_RAWVIDEO, MKTAG('V', 'Y', 'U', 'Y') },
182  { AV_CODEC_ID_RAWVIDEO, MKTAG('I', 'Y', 'U', 'V') },
183  { AV_CODEC_ID_RAWVIDEO, MKTAG('Y', '8', '0', '0') },
184  { AV_CODEC_ID_RAWVIDEO, MKTAG('Y', '8', ' ', ' ') },
185  { AV_CODEC_ID_RAWVIDEO, MKTAG('H', 'D', 'Y', 'C') },
186  { AV_CODEC_ID_RAWVIDEO, MKTAG('Y', 'V', 'U', '9') },
187  { AV_CODEC_ID_RAWVIDEO, MKTAG('V', 'D', 'T', 'Z') }, /* SoftLab-NSK VideoTizer */
188  { AV_CODEC_ID_RAWVIDEO, MKTAG('Y', '4', '1', '1') },
189  { AV_CODEC_ID_RAWVIDEO, MKTAG('N', 'V', '1', '2') },
190  { AV_CODEC_ID_RAWVIDEO, MKTAG('N', 'V', '2', '1') },
191  { AV_CODEC_ID_RAWVIDEO, MKTAG('Y', '4', '1', 'B') },
192  { AV_CODEC_ID_RAWVIDEO, MKTAG('Y', '4', '2', 'B') },
193  { AV_CODEC_ID_RAWVIDEO, MKTAG('Y', 'U', 'V', '9') },
194  { AV_CODEC_ID_RAWVIDEO, MKTAG('Y', 'V', 'U', '9') },
195  { AV_CODEC_ID_RAWVIDEO, MKTAG('a', 'u', 'v', '2') },
196  { AV_CODEC_ID_FRWU, MKTAG('F', 'R', 'W', 'U') },
197  { AV_CODEC_ID_R10K, MKTAG('R', '1', '0', 'k') },
198  { AV_CODEC_ID_R210, MKTAG('r', '2', '1', '0') },
199  { AV_CODEC_ID_V210, MKTAG('v', '2', '1', '0') },
200  { AV_CODEC_ID_V410, MKTAG('v', '4', '1', '0') },
201  { AV_CODEC_ID_INDEO3, MKTAG('I', 'V', '3', '1') },
202  { AV_CODEC_ID_INDEO3, MKTAG('I', 'V', '3', '2') },
203  { AV_CODEC_ID_INDEO4, MKTAG('I', 'V', '4', '1') },
204  { AV_CODEC_ID_INDEO5, MKTAG('I', 'V', '5', '0') },
205  { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '1') },
206  { AV_CODEC_ID_VP3, MKTAG('V', 'P', '3', '0') },
207  { AV_CODEC_ID_VP5, MKTAG('V', 'P', '5', '0') },
208  { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '0') },
209  { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '1') },
210  { AV_CODEC_ID_VP6, MKTAG('V', 'P', '6', '2') },
211  { AV_CODEC_ID_VP6F, MKTAG('V', 'P', '6', 'F') },
212  { AV_CODEC_ID_VP6F, MKTAG('F', 'L', 'V', '4') },
213  { AV_CODEC_ID_VP8, MKTAG('V', 'P', '8', '0') },
214  { AV_CODEC_ID_ASV1, MKTAG('A', 'S', 'V', '1') },
215  { AV_CODEC_ID_ASV2, MKTAG('A', 'S', 'V', '2') },
216  { AV_CODEC_ID_VCR1, MKTAG('V', 'C', 'R', '1') },
217  { AV_CODEC_ID_FFV1, MKTAG('F', 'F', 'V', '1') },
218  { AV_CODEC_ID_XAN_WC4, MKTAG('X', 'x', 'a', 'n') },
219  { AV_CODEC_ID_MIMIC, MKTAG('L', 'M', '2', '0') },
220  { AV_CODEC_ID_MSRLE, MKTAG('m', 'r', 'l', 'e') },
221  { AV_CODEC_ID_MSRLE, MKTAG( 1 , 0 , 0 , 0 ) },
222  { AV_CODEC_ID_MSRLE, MKTAG( 2 , 0 , 0 , 0 ) },
223  { AV_CODEC_ID_MSVIDEO1, MKTAG('M', 'S', 'V', 'C') },
224  { AV_CODEC_ID_MSVIDEO1, MKTAG('m', 's', 'v', 'c') },
225  { AV_CODEC_ID_MSVIDEO1, MKTAG('C', 'R', 'A', 'M') },
226  { AV_CODEC_ID_MSVIDEO1, MKTAG('c', 'r', 'a', 'm') },
227  { AV_CODEC_ID_MSVIDEO1, MKTAG('W', 'H', 'A', 'M') },
228  { AV_CODEC_ID_MSVIDEO1, MKTAG('w', 'h', 'a', 'm') },
229  { AV_CODEC_ID_CINEPAK, MKTAG('c', 'v', 'i', 'd') },
230  { AV_CODEC_ID_TRUEMOTION1, MKTAG('D', 'U', 'C', 'K') },
231  { AV_CODEC_ID_TRUEMOTION1, MKTAG('P', 'V', 'E', 'Z') },
232  { AV_CODEC_ID_MSZH, MKTAG('M', 'S', 'Z', 'H') },
233  { AV_CODEC_ID_ZLIB, MKTAG('Z', 'L', 'I', 'B') },
234  { AV_CODEC_ID_SNOW, MKTAG('S', 'N', 'O', 'W') },
235  { AV_CODEC_ID_4XM, MKTAG('4', 'X', 'M', 'V') },
236  { AV_CODEC_ID_FLV1, MKTAG('F', 'L', 'V', '1') },
237  { AV_CODEC_ID_FLASHSV, MKTAG('F', 'S', 'V', '1') },
238  { AV_CODEC_ID_SVQ1, MKTAG('s', 'v', 'q', '1') },
239  { AV_CODEC_ID_TSCC, MKTAG('t', 's', 'c', 'c') },
240  { AV_CODEC_ID_ULTI, MKTAG('U', 'L', 'T', 'I') },
241  { AV_CODEC_ID_VIXL, MKTAG('V', 'I', 'X', 'L') },
242  { AV_CODEC_ID_QPEG, MKTAG('Q', 'P', 'E', 'G') },
243  { AV_CODEC_ID_QPEG, MKTAG('Q', '1', '.', '0') },
244  { AV_CODEC_ID_QPEG, MKTAG('Q', '1', '.', '1') },
245  { AV_CODEC_ID_WMV3, MKTAG('W', 'M', 'V', '3') },
246  { AV_CODEC_ID_WMV3IMAGE, MKTAG('W', 'M', 'V', 'P') },
247  { AV_CODEC_ID_VC1, MKTAG('W', 'V', 'C', '1') },
248  { AV_CODEC_ID_VC1, MKTAG('W', 'M', 'V', 'A') },
249  { AV_CODEC_ID_VC1IMAGE, MKTAG('W', 'V', 'P', '2') },
250  { AV_CODEC_ID_LOCO, MKTAG('L', 'O', 'C', 'O') },
251  { AV_CODEC_ID_WNV1, MKTAG('W', 'N', 'V', '1') },
252  { AV_CODEC_ID_AASC, MKTAG('A', 'A', 'S', 'C') },
253  { AV_CODEC_ID_INDEO2, MKTAG('R', 'T', '2', '1') },
254  { AV_CODEC_ID_FRAPS, MKTAG('F', 'P', 'S', '1') },
255  { AV_CODEC_ID_THEORA, MKTAG('t', 'h', 'e', 'o') },
256  { AV_CODEC_ID_TRUEMOTION2, MKTAG('T', 'M', '2', '0') },
257  { AV_CODEC_ID_CSCD, MKTAG('C', 'S', 'C', 'D') },
258  { AV_CODEC_ID_ZMBV, MKTAG('Z', 'M', 'B', 'V') },
259  { AV_CODEC_ID_KMVC, MKTAG('K', 'M', 'V', 'C') },
260  { AV_CODEC_ID_CAVS, MKTAG('C', 'A', 'V', 'S') },
261  { AV_CODEC_ID_JPEG2000, MKTAG('m', 'j', 'p', '2') },
262  { AV_CODEC_ID_JPEG2000, MKTAG('M', 'J', '2', 'C') },
263  { AV_CODEC_ID_JPEG2000, MKTAG('L', 'J', '2', 'C') },
264  { AV_CODEC_ID_JPEG2000, MKTAG('L', 'J', '2', 'K') },
265  { AV_CODEC_ID_VMNC, MKTAG('V', 'M', 'n', 'c') },
266  { AV_CODEC_ID_TARGA, MKTAG('t', 'g', 'a', ' ') },
267  { AV_CODEC_ID_PNG, MKTAG('M', 'P', 'N', 'G') },
268  { AV_CODEC_ID_PNG, MKTAG('P', 'N', 'G', '1') },
269  { AV_CODEC_ID_CLJR, MKTAG('C', 'L', 'J', 'R') },
270  { AV_CODEC_ID_DIRAC, MKTAG('d', 'r', 'a', 'c') },
271  { AV_CODEC_ID_RPZA, MKTAG('a', 'z', 'p', 'r') },
272  { AV_CODEC_ID_RPZA, MKTAG('R', 'P', 'Z', 'A') },
273  { AV_CODEC_ID_RPZA, MKTAG('r', 'p', 'z', 'a') },
274  { AV_CODEC_ID_SP5X, MKTAG('S', 'P', '5', '4') },
275  { AV_CODEC_ID_AURA, MKTAG('A', 'U', 'R', 'A') },
276  { AV_CODEC_ID_AURA2, MKTAG('A', 'U', 'R', '2') },
277  { AV_CODEC_ID_DPX, MKTAG('d', 'p', 'x', ' ') },
278  { AV_CODEC_ID_KGV1, MKTAG('K', 'G', 'V', '1') },
279  { AV_CODEC_ID_LAGARITH, MKTAG('L', 'A', 'G', 'S') },
280  { AV_CODEC_ID_UTVIDEO, MKTAG('U', 'L', 'R', 'A') },
281  { AV_CODEC_ID_UTVIDEO, MKTAG('U', 'L', 'R', 'G') },
282  { AV_CODEC_ID_UTVIDEO, MKTAG('U', 'L', 'Y', '0') },
283  { AV_CODEC_ID_UTVIDEO, MKTAG('U', 'L', 'Y', '2') },
284  { AV_CODEC_ID_VBLE, MKTAG('V', 'B', 'L', 'E') },
285  { AV_CODEC_ID_DXTORY, MKTAG('x', 't', 'o', 'r') },
286  { AV_CODEC_ID_ZEROCODEC, MKTAG('Z', 'E', 'C', 'O') },
287  { AV_CODEC_ID_MSS1, MKTAG('M', 'S', 'S', '1') },
288  { AV_CODEC_ID_MSA1, MKTAG('M', 'S', 'A', '1') },
289  { AV_CODEC_ID_TSCC2, MKTAG('T', 'S', 'C', '2') },
290  { AV_CODEC_ID_MTS2, MKTAG('M', 'T', 'S', '2') },
291  { AV_CODEC_ID_CLLC, MKTAG('C', 'L', 'L', 'C') },
292  { AV_CODEC_ID_MSS2, MKTAG('M', 'S', 'S', '2') },
293  { AV_CODEC_ID_SVQ3, MKTAG('S', 'V', 'Q', '3') },
294  { AV_CODEC_ID_NONE, 0 }
295 };
296 
297 const AVCodecTag ff_codec_wav_tags[] = {
298  { AV_CODEC_ID_PCM_S16LE, 0x0001 },
299  { AV_CODEC_ID_PCM_U8, 0x0001 }, /* must come after s16le in this list */
300  { AV_CODEC_ID_PCM_S24LE, 0x0001 },
301  { AV_CODEC_ID_PCM_S32LE, 0x0001 },
302  { AV_CODEC_ID_ADPCM_MS, 0x0002 },
303  { AV_CODEC_ID_PCM_F32LE, 0x0003 },
304  { AV_CODEC_ID_PCM_F64LE, 0x0003 }, /* must come after f32le in this list */
305  { AV_CODEC_ID_PCM_ALAW, 0x0006 },
306  { AV_CODEC_ID_PCM_MULAW, 0x0007 },
307  { AV_CODEC_ID_WMAVOICE, 0x000A },
308  { AV_CODEC_ID_ADPCM_IMA_WAV, 0x0011 },
309  { AV_CODEC_ID_PCM_ZORK, 0x0011 }, /* must come after adpcm_ima_wav in this list */
310  { AV_CODEC_ID_ADPCM_YAMAHA, 0x0020 },
311  { AV_CODEC_ID_TRUESPEECH, 0x0022 },
312  { AV_CODEC_ID_GSM_MS, 0x0031 },
313  { AV_CODEC_ID_ADPCM_G726, 0x0045 },
314  { AV_CODEC_ID_MP2, 0x0050 },
315  { AV_CODEC_ID_MP3, 0x0055 },
316  { AV_CODEC_ID_AMR_NB, 0x0057 },
317  { AV_CODEC_ID_AMR_WB, 0x0058 },
318  { AV_CODEC_ID_ADPCM_IMA_DK4, 0x0061 }, /* rogue format number */
319  { AV_CODEC_ID_ADPCM_IMA_DK3, 0x0062 }, /* rogue format number */
320  { AV_CODEC_ID_ADPCM_IMA_WAV, 0x0069 },
321  { AV_CODEC_ID_VOXWARE, 0x0075 },
322  { AV_CODEC_ID_AAC, 0x00ff },
323  { AV_CODEC_ID_SIPR, 0x0130 },
324  { AV_CODEC_ID_WMAV1, 0x0160 },
325  { AV_CODEC_ID_WMAV2, 0x0161 },
326  { AV_CODEC_ID_WMAPRO, 0x0162 },
327  { AV_CODEC_ID_WMALOSSLESS, 0x0163 },
328  { AV_CODEC_ID_ADPCM_CT, 0x0200 },
329  { AV_CODEC_ID_ATRAC3, 0x0270 },
330  { AV_CODEC_ID_ADPCM_G722, 0x028F },
331  { AV_CODEC_ID_IMC, 0x0401 },
332  { AV_CODEC_ID_IAC, 0x0402 },
333  { AV_CODEC_ID_GSM_MS, 0x1500 },
334  { AV_CODEC_ID_TRUESPEECH, 0x1501 },
335  { AV_CODEC_ID_AAC, 0x1600 }, /* ADTS AAC */
336  { AV_CODEC_ID_AAC_LATM, 0x1602 },
337  { AV_CODEC_ID_AC3, 0x2000 },
338  { AV_CODEC_ID_DTS, 0x2001 },
339  { AV_CODEC_ID_PCM_MULAW, 0x6c75 },
340  { AV_CODEC_ID_AAC, 0x706d },
341  { AV_CODEC_ID_AAC, 0x4143 },
342  { AV_CODEC_ID_SPEEX, 0xA109 },
343  { AV_CODEC_ID_FLAC, 0xF1AC },
344  { AV_CODEC_ID_ADPCM_SWF, ('S'<<8)+'F' },
345  { AV_CODEC_ID_VORBIS, ('V'<<8)+'o' }, //HACK/FIXME, does vorbis in WAV/AVI have an (in)official id?
346  { AV_CODEC_ID_NONE, 0 },
347 };
348 
349 const AVMetadataConv ff_riff_info_conv[] = {
350  { "IART", "artist" },
351  { "ICMT", "comment" },
352  { "ICOP", "copyright" },
353  { "ICRD", "date" },
354  { "IGNR", "genre" },
355  { "ILNG", "language" },
356  { "INAM", "title" },
357  { "IPRD", "album" },
358  { "IPRT", "track" },
359  { "ISFT", "encoder" },
360  { "ITCH", "encoded_by"},
361  { 0 },
362 };
363 
364 #if CONFIG_MUXERS
365 int64_t ff_start_tag(AVIOContext *pb, const char *tag)
366 {
367  ffio_wfourcc(pb, tag);
368  avio_wl32(pb, 0);
369  return avio_tell(pb);
370 }
371 
372 void ff_end_tag(AVIOContext *pb, int64_t start)
373 {
374  int64_t pos;
375 
376  pos = avio_tell(pb);
377  avio_seek(pb, start - 4, SEEK_SET);
378  avio_wl32(pb, (uint32_t)(pos - start));
379  avio_seek(pb, pos, SEEK_SET);
380 }
381 
382 /* WAVEFORMATEX header */
383 /* returns the size or -1 on error */
384 int ff_put_wav_header(AVIOContext *pb, AVCodecContext *enc)
385 {
386  int bps, blkalign, bytespersec, frame_size;
387  int hdrsize = 18;
388  int waveformatextensible;
389  uint8_t temp[256];
390  uint8_t *riff_extradata= temp;
391  uint8_t *riff_extradata_start= temp;
392 
393  if(!enc->codec_tag || enc->codec_tag > 0xffff)
394  return -1;
395 
396  /* We use the known constant frame size for the codec if known, otherwise
397  fallback to using AVCodecContext.frame_size, which is not as reliable
398  for indicating packet duration */
399  frame_size = av_get_audio_frame_duration(enc, 0);
400  if (!frame_size)
401  frame_size = enc->frame_size;
402 
403  waveformatextensible = (enc->channels > 2 && enc->channel_layout)
404  || enc->sample_rate > 48000
405  || av_get_bits_per_sample(enc->codec_id) > 16;
406 
407  if (waveformatextensible) {
408  avio_wl16(pb, 0xfffe);
409  } else {
410  avio_wl16(pb, enc->codec_tag);
411  }
412  avio_wl16(pb, enc->channels);
413  avio_wl32(pb, enc->sample_rate);
414  if (enc->codec_id == AV_CODEC_ID_MP2 || enc->codec_id == AV_CODEC_ID_MP3 || enc->codec_id == AV_CODEC_ID_GSM_MS) {
415  bps = 0;
416  } else {
417  if (!(bps = av_get_bits_per_sample(enc->codec_id))) {
418  if (enc->bits_per_coded_sample)
419  bps = enc->bits_per_coded_sample;
420  else
421  bps = 16; // default to 16
422  }
423  }
424  if(bps != enc->bits_per_coded_sample && enc->bits_per_coded_sample){
425  av_log(enc, AV_LOG_WARNING, "requested bits_per_coded_sample (%d) and actually stored (%d) differ\n", enc->bits_per_coded_sample, bps);
426  }
427 
428  if (enc->codec_id == AV_CODEC_ID_MP2 || enc->codec_id == AV_CODEC_ID_MP3) {
429  /* this is wrong, but it seems many demuxers do not work if this is set
430  correctly */
431  blkalign = frame_size;
432  //blkalign = 144 * enc->bit_rate/enc->sample_rate;
433  } else if (enc->codec_id == AV_CODEC_ID_AC3) {
434  blkalign = 3840; //maximum bytes per frame
435  } else if (enc->block_align != 0) { /* specified by the codec */
436  blkalign = enc->block_align;
437  } else
438  blkalign = bps * enc->channels / av_gcd(8, bps);
439  if (enc->codec_id == AV_CODEC_ID_PCM_U8 ||
440  enc->codec_id == AV_CODEC_ID_PCM_S24LE ||
441  enc->codec_id == AV_CODEC_ID_PCM_S32LE ||
442  enc->codec_id == AV_CODEC_ID_PCM_F32LE ||
443  enc->codec_id == AV_CODEC_ID_PCM_F64LE ||
444  enc->codec_id == AV_CODEC_ID_PCM_S16LE) {
445  bytespersec = enc->sample_rate * blkalign;
446  } else {
447  bytespersec = enc->bit_rate / 8;
448  }
449  avio_wl32(pb, bytespersec); /* bytes per second */
450  avio_wl16(pb, blkalign); /* block align */
451  avio_wl16(pb, bps); /* bits per sample */
452  if (enc->codec_id == AV_CODEC_ID_MP3) {
453  hdrsize += 12;
454  bytestream_put_le16(&riff_extradata, 1); /* wID */
455  bytestream_put_le32(&riff_extradata, 2); /* fdwFlags */
456  bytestream_put_le16(&riff_extradata, 1152); /* nBlockSize */
457  bytestream_put_le16(&riff_extradata, 1); /* nFramesPerBlock */
458  bytestream_put_le16(&riff_extradata, 1393); /* nCodecDelay */
459  } else if (enc->codec_id == AV_CODEC_ID_MP2) {
460  hdrsize += 22;
461  bytestream_put_le16(&riff_extradata, 2); /* fwHeadLayer */
462  bytestream_put_le32(&riff_extradata, enc->bit_rate); /* dwHeadBitrate */
463  bytestream_put_le16(&riff_extradata, enc->channels == 2 ? 1 : 8); /* fwHeadMode */
464  bytestream_put_le16(&riff_extradata, 0); /* fwHeadModeExt */
465  bytestream_put_le16(&riff_extradata, 1); /* wHeadEmphasis */
466  bytestream_put_le16(&riff_extradata, 16); /* fwHeadFlags */
467  bytestream_put_le32(&riff_extradata, 0); /* dwPTSLow */
468  bytestream_put_le32(&riff_extradata, 0); /* dwPTSHigh */
469  } else if (enc->codec_id == AV_CODEC_ID_GSM_MS || enc->codec_id == AV_CODEC_ID_ADPCM_IMA_WAV) {
470  hdrsize += 2;
471  bytestream_put_le16(&riff_extradata, frame_size); /* wSamplesPerBlock */
472  } else if(enc->extradata_size){
473  riff_extradata_start= enc->extradata;
474  riff_extradata= enc->extradata + enc->extradata_size;
475  hdrsize += enc->extradata_size;
476  }
477  if(waveformatextensible) { /* write WAVEFORMATEXTENSIBLE extensions */
478  hdrsize += 22;
479  avio_wl16(pb, riff_extradata - riff_extradata_start + 22); /* 22 is WAVEFORMATEXTENSIBLE size */
480  avio_wl16(pb, bps); /* ValidBitsPerSample || SamplesPerBlock || Reserved */
481  avio_wl32(pb, enc->channel_layout); /* dwChannelMask */
482  avio_wl32(pb, enc->codec_tag); /* GUID + next 3 */
483  avio_wl32(pb, 0x00100000);
484  avio_wl32(pb, 0xAA000080);
485  avio_wl32(pb, 0x719B3800);
486  } else {
487  avio_wl16(pb, riff_extradata - riff_extradata_start); /* cbSize */
488  }
489  avio_write(pb, riff_extradata_start, riff_extradata - riff_extradata_start);
490  if(hdrsize&1){
491  hdrsize++;
492  avio_w8(pb, 0);
493  }
494 
495  return hdrsize;
496 }
497 
498 /* BITMAPINFOHEADER header */
499 void ff_put_bmp_header(AVIOContext *pb, AVCodecContext *enc, const AVCodecTag *tags, int for_asf)
500 {
501  avio_wl32(pb, 40 + enc->extradata_size); /* size */
502  avio_wl32(pb, enc->width);
503  //We always store RGB TopDown
504  avio_wl32(pb, enc->codec_tag ? enc->height : -enc->height);
505  avio_wl16(pb, 1); /* planes */
506 
507  avio_wl16(pb, enc->bits_per_coded_sample ? enc->bits_per_coded_sample : 24); /* depth */
508  /* compression type */
509  avio_wl32(pb, enc->codec_tag);
510  avio_wl32(pb, enc->width * enc->height * 3);
511  avio_wl32(pb, 0);
512  avio_wl32(pb, 0);
513  avio_wl32(pb, 0);
514  avio_wl32(pb, 0);
515 
516  avio_write(pb, enc->extradata, enc->extradata_size);
517 
518  if (!for_asf && enc->extradata_size & 1)
519  avio_w8(pb, 0);
520 }
521 
522 void ff_parse_specific_params(AVCodecContext *stream, int *au_rate, int *au_ssize, int *au_scale)
523 {
524  int gcd;
525  int audio_frame_size;
526 
527  /* We use the known constant frame size for the codec if known, otherwise
528  fallback to using AVCodecContext.frame_size, which is not as reliable
529  for indicating packet duration */
530  audio_frame_size = av_get_audio_frame_duration(stream, 0);
531  if (!audio_frame_size)
532  audio_frame_size = stream->frame_size;
533 
534  *au_ssize= stream->block_align;
535  if (audio_frame_size && stream->sample_rate) {
536  *au_scale = audio_frame_size;
537  *au_rate= stream->sample_rate;
538  }else if(stream->codec_type == AVMEDIA_TYPE_VIDEO ||
539  stream->codec_type == AVMEDIA_TYPE_DATA ||
540  stream->codec_type == AVMEDIA_TYPE_SUBTITLE){
541  *au_scale= stream->time_base.num;
542  *au_rate = stream->time_base.den;
543  }else{
544  *au_scale= stream->block_align ? stream->block_align*8 : 8;
545  *au_rate = stream->bit_rate ? stream->bit_rate : 8*stream->sample_rate;
546  }
547  gcd= av_gcd(*au_scale, *au_rate);
548  *au_scale /= gcd;
549  *au_rate /= gcd;
550 }
551 
552 void ff_riff_write_info_tag(AVIOContext *pb, const char *tag, const char *str)
553 {
554  int len = strlen(str);
555  if (len > 0) {
556  len++;
557  ffio_wfourcc(pb, tag);
558  avio_wl32(pb, len);
559  avio_put_str(pb, str);
560  if (len & 1)
561  avio_w8(pb, 0);
562  }
563 }
564 
565 static const char riff_tags[][5] = {
566  "IARL", "IART", "ICMS", "ICMT", "ICOP", "ICRD", "ICRP", "IDIM", "IDPI",
567  "IENG", "IGNR", "IKEY", "ILGT", "ILNG", "IMED", "INAM", "IPLT", "IPRD",
568  "IPRT", "ISBJ", "ISFT", "ISHP", "ISRC", "ISRF", "ITCH",
569  {0}
570 };
571 
572 static int riff_has_valid_tags(AVFormatContext *s)
573 {
574  int i;
575 
576  for (i = 0; *riff_tags[i]; i++) {
577  if (av_dict_get(s->metadata, riff_tags[i], NULL, AV_DICT_MATCH_CASE))
578  return 1;
579  }
580 
581  return 0;
582 }
583 
584 void ff_riff_write_info(AVFormatContext *s)
585 {
586  AVIOContext *pb = s->pb;
587  int i;
588  int64_t list_pos;
589  AVDictionaryEntry *t = NULL;
590 
591  ff_metadata_conv(&s->metadata, ff_riff_info_conv, NULL);
592 
593  /* writing empty LIST is not nice and may cause problems */
594  if (!riff_has_valid_tags(s))
595  return;
596 
597  list_pos = ff_start_tag(pb, "LIST");
598  ffio_wfourcc(pb, "INFO");
599  for (i = 0; *riff_tags[i]; i++) {
600  if ((t = av_dict_get(s->metadata, riff_tags[i], NULL, AV_DICT_MATCH_CASE)))
601  ff_riff_write_info_tag(s->pb, t->key, t->value);
602  }
603  ff_end_tag(pb, list_pos);
604 }
605 #endif //CONFIG_MUXERS
606 
607 #if CONFIG_DEMUXERS
608 /* We could be given one of the three possible structures here:
609  * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
610  * is an expansion of the previous one with the fields added
611  * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
612  * WAVEFORMATEX adds 'WORD cbSize' and basically makes itself
613  * an openended structure.
614  */
615 int ff_get_wav_header(AVIOContext *pb, AVCodecContext *codec, int size)
616 {
617  int id;
618 
619  id = avio_rl16(pb);
620  codec->codec_type = AVMEDIA_TYPE_AUDIO;
621  codec->codec_tag = id;
622  codec->channels = avio_rl16(pb);
623  codec->sample_rate = avio_rl32(pb);
624  codec->bit_rate = avio_rl32(pb) * 8;
625  codec->block_align = avio_rl16(pb);
626  if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
627  codec->bits_per_coded_sample = 8;
628  }else
629  codec->bits_per_coded_sample = avio_rl16(pb);
630  if (size >= 18) { /* We're obviously dealing with WAVEFORMATEX */
631  int cbSize = avio_rl16(pb); /* cbSize */
632  size -= 18;
633  cbSize = FFMIN(size, cbSize);
634  if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
635  codec->bits_per_coded_sample = avio_rl16(pb);
636  codec->channel_layout = avio_rl32(pb); /* dwChannelMask */
637  id = avio_rl32(pb); /* 4 first bytes of GUID */
638  avio_skip(pb, 12); /* skip end of GUID */
639  cbSize -= 22;
640  size -= 22;
641  }
642  codec->extradata_size = cbSize;
643  if (cbSize > 0) {
644  av_free(codec->extradata);
645  codec->extradata = av_mallocz(codec->extradata_size + FF_INPUT_BUFFER_PADDING_SIZE);
646  if (!codec->extradata)
647  return AVERROR(ENOMEM);
648  avio_read(pb, codec->extradata, codec->extradata_size);
649  size -= cbSize;
650  }
651 
652  /* It is possible for the chunk to contain garbage at the end */
653  if (size > 0)
654  avio_skip(pb, size);
655  }
656  codec->codec_id = ff_wav_codec_get_id(id, codec->bits_per_coded_sample);
657  if (codec->codec_id == AV_CODEC_ID_AAC_LATM) {
658  /* channels and sample_rate values are those prior to applying SBR and/or PS */
659  codec->channels = 0;
660  codec->sample_rate = 0;
661  }
662  /* override bits_per_coded_sample for G.726 */
663  if (codec->codec_id == AV_CODEC_ID_ADPCM_G726)
664  codec->bits_per_coded_sample = codec->bit_rate / codec->sample_rate;
665 
666  return 0;
667 }
668 
669 
670 enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
671 {
672  enum AVCodecID id;
673  id = ff_codec_get_id(ff_codec_wav_tags, tag);
674  if (id <= 0)
675  return id;
676 
677  if (id == AV_CODEC_ID_PCM_S16LE)
678  id = ff_get_pcm_codec_id(bps, 0, 0, ~1);
679  else if (id == AV_CODEC_ID_PCM_F32LE)
680  id = ff_get_pcm_codec_id(bps, 1, 0, 0);
681 
682  if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8)
683  id = AV_CODEC_ID_PCM_ZORK;
684  return id;
685 }
686 
687 int ff_get_bmp_header(AVIOContext *pb, AVStream *st)
688 {
689  int tag1;
690  avio_rl32(pb); /* size */
691  st->codec->width = avio_rl32(pb);
692  st->codec->height = (int32_t)avio_rl32(pb);
693  avio_rl16(pb); /* planes */
694  st->codec->bits_per_coded_sample= avio_rl16(pb); /* depth */
695  tag1 = avio_rl32(pb);
696  avio_rl32(pb); /* ImageSize */
697  avio_rl32(pb); /* XPelsPerMeter */
698  avio_rl32(pb); /* YPelsPerMeter */
699  avio_rl32(pb); /* ClrUsed */
700  avio_rl32(pb); /* ClrImportant */
701  return tag1;
702 }
703 
704 int ff_read_riff_info(AVFormatContext *s, int64_t size)
705 {
706  int64_t start, end, cur;
707  AVIOContext *pb = s->pb;
708 
709  start = avio_tell(pb);
710  end = start + size;
711 
712  while ((cur = avio_tell(pb)) >= 0 && cur <= end - 8 /* = tag + size */) {
713  uint32_t chunk_code;
714  int64_t chunk_size;
715  char key[5] = {0};
716  char *value;
717 
718  chunk_code = avio_rl32(pb);
719  chunk_size = avio_rl32(pb);
720 
721  if (chunk_size > end || end - chunk_size < cur || chunk_size == UINT_MAX) {
722  av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n");
723  break;
724  }
725 
726  chunk_size += (chunk_size & 1);
727 
728  if (!chunk_code) {
729  if (chunk_size)
730  avio_skip(pb, chunk_size);
731  else if (pb->eof_reached) {
732  av_log(s, AV_LOG_WARNING, "truncated file\n");
733  return AVERROR_EOF;
734  }
735  continue;
736  }
737 
738  value = av_malloc(chunk_size + 1);
739  if (!value) {
740  av_log(s, AV_LOG_ERROR, "out of memory, unable to read INFO tag\n");
741  return AVERROR(ENOMEM);
742  }
743 
744  AV_WL32(key, chunk_code);
745 
746  if (avio_read(pb, value, chunk_size) != chunk_size) {
747  av_free(value);
748  av_log(s, AV_LOG_WARNING, "premature end of file while reading INFO tag\n");
749  break;
750  }
751 
752  value[chunk_size] = 0;
753 
754  av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
755  }
756 
757  return 0;
758 }
759 #endif // CONFIG_DEMUXERS