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path: root/libavformat/riffdec.c (plain)
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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
32int 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
44enum 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
61static void parse_waveformatex(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(pb, 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 */
91int 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(pb, par);
144 cbSize -= 22;
145 size -= 22;
146 }
147 if (cbSize > 0) {
148 av_freep(&par->extradata);
149 if (ff_get_extradata(s, par, pb, cbSize) < 0)
150 return AVERROR(ENOMEM);
151 size -= cbSize;
152 }
153
154 /* It is possible for the chunk to contain garbage at the end */
155 if (size > 0)
156 avio_skip(pb, size);
157 } else if (id == 0x0165 && size >= 32) {
158 int nb_streams, i;
159
160 size -= 4;
161 av_freep(&par->extradata);
162 if (ff_get_extradata(s, par, pb, size) < 0)
163 return AVERROR(ENOMEM);
164 nb_streams = AV_RL16(par->extradata + 4);
165 par->sample_rate = AV_RL32(par->extradata + 12);
166 par->channels = 0;
167 bitrate = 0;
168 if (size < 8 + nb_streams * 20)
169 return AVERROR_INVALIDDATA;
170 for (i = 0; i < nb_streams; i++)
171 par->channels += par->extradata[8 + i * 20 + 17];
172 }
173
174 par->bit_rate = bitrate;
175
176 if (par->sample_rate <= 0) {
177 av_log(s, AV_LOG_ERROR,
178 "Invalid sample rate: %d\n", par->sample_rate);
179 return AVERROR_INVALIDDATA;
180 }
181 if (par->codec_id == AV_CODEC_ID_AAC_LATM) {
182 /* Channels and sample_rate values are those prior to applying SBR
183 * and/or PS. */
184 par->channels = 0;
185 par->sample_rate = 0;
186 }
187 /* override bits_per_coded_sample for G.726 */
188 if (par->codec_id == AV_CODEC_ID_ADPCM_G726 && par->sample_rate)
189 par->bits_per_coded_sample = par->bit_rate / par->sample_rate;
190
191 return 0;
192}
193
194enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
195{
196 enum AVCodecID id;
197 id = ff_codec_get_id(ff_codec_wav_tags, tag);
198 if (id <= 0)
199 return id;
200
201 if (id == AV_CODEC_ID_PCM_S16LE)
202 id = ff_get_pcm_codec_id(bps, 0, 0, ~1);
203 else if (id == AV_CODEC_ID_PCM_F32LE)
204 id = ff_get_pcm_codec_id(bps, 1, 0, 0);
205
206 if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8)
207 id = AV_CODEC_ID_PCM_ZORK;
208 return id;
209}
210
211int ff_get_bmp_header(AVIOContext *pb, AVStream *st, unsigned *esize)
212{
213 int tag1;
214 if(esize) *esize = avio_rl32(pb);
215 else avio_rl32(pb);
216 st->codecpar->width = avio_rl32(pb);
217 st->codecpar->height = (int32_t)avio_rl32(pb);
218 avio_rl16(pb); /* planes */
219 st->codecpar->bits_per_coded_sample = avio_rl16(pb); /* depth */
220 tag1 = avio_rl32(pb);
221 avio_rl32(pb); /* ImageSize */
222 avio_rl32(pb); /* XPelsPerMeter */
223 avio_rl32(pb); /* YPelsPerMeter */
224 avio_rl32(pb); /* ClrUsed */
225 avio_rl32(pb); /* ClrImportant */
226 return tag1;
227}
228
229int ff_read_riff_info(AVFormatContext *s, int64_t size)
230{
231 int64_t start, end, cur;
232 AVIOContext *pb = s->pb;
233
234 start = avio_tell(pb);
235 end = start + size;
236
237 while ((cur = avio_tell(pb)) >= 0 &&
238 cur <= end - 8 /* = tag + size */) {
239 uint32_t chunk_code;
240 int64_t chunk_size;
241 char key[5] = { 0 };
242 char *value;
243
244 chunk_code = avio_rl32(pb);
245 chunk_size = avio_rl32(pb);
246 if (avio_feof(pb)) {
247 if (chunk_code || chunk_size) {
248 av_log(s, AV_LOG_WARNING, "INFO subchunk truncated\n");
249 return AVERROR_INVALIDDATA;
250 }
251 return AVERROR_EOF;
252 }
253 if (chunk_size > end ||
254 end - chunk_size < cur ||
255 chunk_size == UINT_MAX) {
256 avio_seek(pb, -9, SEEK_CUR);
257 chunk_code = avio_rl32(pb);
258 chunk_size = avio_rl32(pb);
259 if (chunk_size > end || end - chunk_size < cur || chunk_size == UINT_MAX) {
260 av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n");
261 return AVERROR_INVALIDDATA;
262 }
263 }
264
265 chunk_size += (chunk_size & 1);
266
267 if (!chunk_code) {
268 if (chunk_size)
269 avio_skip(pb, chunk_size);
270 else if (pb->eof_reached) {
271 av_log(s, AV_LOG_WARNING, "truncated file\n");
272 return AVERROR_EOF;
273 }
274 continue;
275 }
276
277 value = av_mallocz(chunk_size + 1);
278 if (!value) {
279 av_log(s, AV_LOG_ERROR,
280 "out of memory, unable to read INFO tag\n");
281 return AVERROR(ENOMEM);
282 }
283
284 AV_WL32(key, chunk_code);
285 // Work around VC++ 2015 Update 1 code-gen bug:
286 // https://connect.microsoft.com/VisualStudio/feedback/details/2291638
287 key[4] = 0;
288
289 if (avio_read(pb, value, chunk_size) != chunk_size) {
290 av_log(s, AV_LOG_WARNING,
291 "premature end of file while reading INFO tag\n");
292 }
293
294 av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
295 }
296
297 return 0;
298}
299
generated by cgit at 2024-05-17 06:09:13 (GMT)