1 /*
2 * RIFF demuxing functions and data
3 * Copyright (c) 2000 Fabrice Bellard
4 *
5 * This file is part of FFmpeg.
6 *
7 * FFmpeg 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 * FFmpeg 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 FFmpeg; 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/dict.h"
23 #include "libavutil/error.h"
24 #include "libavutil/log.h"
25 #include "libavutil/mathematics.h"
26 #include "libavcodec/avcodec.h"
27 #include "libavcodec/bytestream.h"
28 #include "avformat.h"
29 #include "avio_internal.h"
30 #include "riff.h"
31
ff_get_guid(AVIOContext * s,ff_asf_guid * g)32 int ff_get_guid(AVIOContext *s, ff_asf_guid *g)
33 {
34 int ret;
35 av_assert0(sizeof(*g) == 16); //compiler will optimize this out
36 ret = avio_read(s, *g, sizeof(*g));
37 if (ret < (int)sizeof(*g)) {
38 memset(*g, 0, sizeof(*g));
39 return ret < 0 ? ret : AVERROR_INVALIDDATA;
40 }
41 return 0;
42 }
43
ff_codec_guid_get_id(const AVCodecGuid * guids,ff_asf_guid guid)44 enum AVCodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
45 {
46 int i;
47 for (i = 0; guids[i].id != AV_CODEC_ID_NONE; i++)
48 if (!ff_guidcmp(guids[i].guid, guid))
49 return guids[i].id;
50 return AV_CODEC_ID_NONE;
51 }
52
53 /* We could be given one of the three possible structures here:
54 * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
55 * is an expansion of the previous one with the fields added
56 * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
57 * WAVEFORMATEX adds 'WORD cbSize' and basically makes itself
58 * an openended structure.
59 */
60
parse_waveformatex(AVFormatContext * s,AVIOContext * pb,AVCodecParameters * par)61 static void parse_waveformatex(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par)
62 {
63 ff_asf_guid subformat;
64 int bps;
65
66 bps = avio_rl16(pb);
67 if (bps)
68 par->bits_per_coded_sample = bps;
69 par->channel_layout = avio_rl32(pb); /* dwChannelMask */
70
71 ff_get_guid(pb, &subformat);
72 if (!memcmp(subformat + 4,
73 (const uint8_t[]){ FF_AMBISONIC_BASE_GUID }, 12) ||
74 !memcmp(subformat + 4,
75 (const uint8_t[]){ FF_BROKEN_BASE_GUID }, 12) ||
76 !memcmp(subformat + 4,
77 (const uint8_t[]){ FF_MEDIASUBTYPE_BASE_GUID }, 12)) {
78 par->codec_tag = AV_RL32(subformat);
79 par->codec_id = ff_wav_codec_get_id(par->codec_tag,
80 par->bits_per_coded_sample);
81 } else {
82 par->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subformat);
83 if (!par->codec_id)
84 av_log(s, AV_LOG_WARNING,
85 "unknown subformat:"FF_PRI_GUID"\n",
86 FF_ARG_GUID(subformat));
87 }
88 }
89
90 /* "big_endian" values are needed for RIFX file format */
ff_get_wav_header(AVFormatContext * s,AVIOContext * pb,AVCodecParameters * par,int size,int big_endian)91 int ff_get_wav_header(AVFormatContext *s, AVIOContext *pb,
92 AVCodecParameters *par, int size, int big_endian)
93 {
94 int id;
95 uint64_t bitrate = 0;
96
97 if (size < 14) {
98 avpriv_request_sample(s, "wav header size < 14");
99 return AVERROR_INVALIDDATA;
100 }
101
102 par->codec_type = AVMEDIA_TYPE_AUDIO;
103 if (!big_endian) {
104 id = avio_rl16(pb);
105 if (id != 0x0165) {
106 par->channels = avio_rl16(pb);
107 par->sample_rate = avio_rl32(pb);
108 bitrate = avio_rl32(pb) * 8LL;
109 par->block_align = avio_rl16(pb);
110 }
111 } else {
112 id = avio_rb16(pb);
113 par->channels = avio_rb16(pb);
114 par->sample_rate = avio_rb32(pb);
115 bitrate = avio_rb32(pb) * 8LL;
116 par->block_align = avio_rb16(pb);
117 }
118 if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
119 par->bits_per_coded_sample = 8;
120 } else {
121 if (!big_endian) {
122 par->bits_per_coded_sample = avio_rl16(pb);
123 } else {
124 par->bits_per_coded_sample = avio_rb16(pb);
125 }
126 }
127 if (id == 0xFFFE) {
128 par->codec_tag = 0;
129 } else {
130 par->codec_tag = id;
131 par->codec_id = ff_wav_codec_get_id(id,
132 par->bits_per_coded_sample);
133 }
134 if (size >= 18 && id != 0x0165) { /* We're obviously dealing with WAVEFORMATEX */
135 int cbSize = avio_rl16(pb); /* cbSize */
136 if (big_endian) {
137 avpriv_report_missing_feature(s, "WAVEFORMATEX support for RIFX files");
138 return AVERROR_PATCHWELCOME;
139 }
140 size -= 18;
141 cbSize = FFMIN(size, cbSize);
142 if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
143 parse_waveformatex(s, pb, par);
144 cbSize -= 22;
145 size -= 22;
146 }
147 if (cbSize > 0) {
148 if (ff_get_extradata(s, par, pb, cbSize) < 0)
149 return AVERROR(ENOMEM);
150 size -= cbSize;
151 }
152
153 /* It is possible for the chunk to contain garbage at the end */
154 if (size > 0)
155 avio_skip(pb, size);
156 } else if (id == 0x0165 && size >= 32) {
157 int nb_streams, i;
158
159 size -= 4;
160 if (ff_get_extradata(s, par, pb, size) < 0)
161 return AVERROR(ENOMEM);
162 nb_streams = AV_RL16(par->extradata + 4);
163 par->sample_rate = AV_RL32(par->extradata + 12);
164 par->channels = 0;
165 bitrate = 0;
166 if (size < 8 + nb_streams * 20)
167 return AVERROR_INVALIDDATA;
168 for (i = 0; i < nb_streams; i++)
169 par->channels += par->extradata[8 + i * 20 + 17];
170 }
171
172 par->bit_rate = bitrate;
173
174 if (par->sample_rate <= 0) {
175 av_log(s, AV_LOG_ERROR,
176 "Invalid sample rate: %d\n", par->sample_rate);
177 return AVERROR_INVALIDDATA;
178 }
179 if (par->codec_id == AV_CODEC_ID_AAC_LATM) {
180 /* Channels and sample_rate values are those prior to applying SBR
181 * and/or PS. */
182 par->channels = 0;
183 par->sample_rate = 0;
184 }
185 /* override bits_per_coded_sample for G.726 */
186 if (par->codec_id == AV_CODEC_ID_ADPCM_G726 && par->sample_rate)
187 par->bits_per_coded_sample = par->bit_rate / par->sample_rate;
188
189 return 0;
190 }
191
ff_wav_codec_get_id(unsigned int tag,int bps)192 enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
193 {
194 enum AVCodecID id;
195 id = ff_codec_get_id(ff_codec_wav_tags, tag);
196 if (id <= 0)
197 return id;
198
199 if (id == AV_CODEC_ID_PCM_S16LE)
200 id = ff_get_pcm_codec_id(bps, 0, 0, ~1);
201 else if (id == AV_CODEC_ID_PCM_F32LE)
202 id = ff_get_pcm_codec_id(bps, 1, 0, 0);
203
204 if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8)
205 id = AV_CODEC_ID_ADPCM_ZORK;
206 return id;
207 }
208
ff_get_bmp_header(AVIOContext * pb,AVStream * st,uint32_t * size)209 int ff_get_bmp_header(AVIOContext *pb, AVStream *st, uint32_t *size)
210 {
211 int tag1;
212 uint32_t size_ = avio_rl32(pb);
213 if (size)
214 *size = size_;
215 st->codecpar->width = avio_rl32(pb);
216 st->codecpar->height = (int32_t)avio_rl32(pb);
217 avio_rl16(pb); /* planes */
218 st->codecpar->bits_per_coded_sample = avio_rl16(pb); /* depth */
219 tag1 = avio_rl32(pb);
220 avio_rl32(pb); /* ImageSize */
221 avio_rl32(pb); /* XPelsPerMeter */
222 avio_rl32(pb); /* YPelsPerMeter */
223 avio_rl32(pb); /* ClrUsed */
224 avio_rl32(pb); /* ClrImportant */
225 return tag1;
226 }
227
ff_read_riff_info(AVFormatContext * s,int64_t size)228 int ff_read_riff_info(AVFormatContext *s, int64_t size)
229 {
230 int64_t start, end, cur;
231 AVIOContext *pb = s->pb;
232
233 start = avio_tell(pb);
234 end = start + size;
235
236 while ((cur = avio_tell(pb)) >= 0 &&
237 cur <= end - 8 /* = tag + size */) {
238 uint32_t chunk_code;
239 int64_t chunk_size;
240 char key[5] = { 0 };
241 char *value;
242
243 chunk_code = avio_rl32(pb);
244 chunk_size = avio_rl32(pb);
245 if (avio_feof(pb)) {
246 if (chunk_code || chunk_size) {
247 av_log(s, AV_LOG_WARNING, "INFO subchunk truncated\n");
248 return AVERROR_INVALIDDATA;
249 }
250 return AVERROR_EOF;
251 }
252 if (chunk_size > end ||
253 end - chunk_size < cur ||
254 chunk_size == UINT_MAX) {
255 avio_seek(pb, -9, SEEK_CUR);
256 chunk_code = avio_rl32(pb);
257 chunk_size = avio_rl32(pb);
258 if (chunk_size > end || end - chunk_size < cur || chunk_size == UINT_MAX) {
259 av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n");
260 return AVERROR_INVALIDDATA;
261 }
262 }
263
264 chunk_size += (chunk_size & 1);
265
266 if (!chunk_code) {
267 if (chunk_size)
268 avio_skip(pb, chunk_size);
269 else if (pb->eof_reached) {
270 av_log(s, AV_LOG_WARNING, "truncated file\n");
271 return AVERROR_EOF;
272 }
273 continue;
274 }
275
276 value = av_mallocz(chunk_size + 1);
277 if (!value) {
278 av_log(s, AV_LOG_ERROR,
279 "out of memory, unable to read INFO tag\n");
280 return AVERROR(ENOMEM);
281 }
282
283 AV_WL32(key, chunk_code);
284 // Work around VC++ 2015 Update 1 code-gen bug:
285 // https://connect.microsoft.com/VisualStudio/feedback/details/2291638
286 key[4] = 0;
287
288 if (avio_read(pb, value, chunk_size) != chunk_size) {
289 av_log(s, AV_LOG_WARNING,
290 "premature end of file while reading INFO tag\n");
291 }
292
293 av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
294 }
295
296 return 0;
297 }
298