2 * RIFF demuxing functions and data
3 * Copyright (c) 2000 Fabrice Bellard
5 * This file is part of FFmpeg.
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.
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.
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
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"
29 #include "avio_internal.h"
32 int ff_get_guid(AVIOContext *s, ff_asf_guid *g)
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;
44 enum AVCodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
47 for (i = 0; guids[i].id != AV_CODEC_ID_NONE; i++)
48 if (!ff_guidcmp(guids[i].guid, guid))
50 return AV_CODEC_ID_NONE;
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.
61 static void parse_waveformatex(AVIOContext *pb, AVCodecParameters *par)
63 ff_asf_guid subformat;
68 par->bits_per_coded_sample = bps;
69 par->channel_layout = avio_rl32(pb); /* dwChannelMask */
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);
82 par->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subformat);
84 av_log(pb, AV_LOG_WARNING,
85 "unknown subformat:"FF_PRI_GUID"\n",
86 FF_ARG_GUID(subformat));
90 /* "big_endian" values are needed for RIFX file format */
91 int ff_get_wav_header(AVFormatContext *s, AVIOContext *pb,
92 AVCodecParameters *par, int size, int big_endian)
98 avpriv_request_sample(s, "wav header size < 14");
99 return AVERROR_INVALIDDATA;
102 par->codec_type = AVMEDIA_TYPE_AUDIO;
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);
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);
118 if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
119 par->bits_per_coded_sample = 8;
122 par->bits_per_coded_sample = avio_rl16(pb);
124 par->bits_per_coded_sample = avio_rb16(pb);
131 par->codec_id = ff_wav_codec_get_id(id,
132 par->bits_per_coded_sample);
134 if (size >= 18 && id != 0x0165) { /* We're obviously dealing with WAVEFORMATEX */
135 int cbSize = avio_rl16(pb); /* cbSize */
137 avpriv_report_missing_feature(s, "WAVEFORMATEX support for RIFX files");
138 return AVERROR_PATCHWELCOME;
141 cbSize = FFMIN(size, cbSize);
142 if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
143 parse_waveformatex(pb, par);
148 av_freep(&par->extradata);
149 if (ff_get_extradata(s, par, pb, cbSize) < 0)
150 return AVERROR(ENOMEM);
154 /* It is possible for the chunk to contain garbage at the end */
157 } else if (id == 0x0165 && size >= 32) {
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);
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];
174 par->bit_rate = bitrate;
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;
181 if (par->codec_id == AV_CODEC_ID_AAC_LATM) {
182 /* Channels and sample_rate values are those prior to applying SBR
185 par->sample_rate = 0;
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;
194 enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
197 id = ff_codec_get_id(ff_codec_wav_tags, tag);
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);
206 if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8)
207 id = AV_CODEC_ID_PCM_ZORK;
211 int ff_get_bmp_header(AVIOContext *pb, AVStream *st, unsigned *esize)
214 if(esize) *esize = 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 */
229 int ff_read_riff_info(AVFormatContext *s, int64_t size)
231 int64_t start, end, cur;
232 AVIOContext *pb = s->pb;
234 start = avio_tell(pb);
237 while ((cur = avio_tell(pb)) >= 0 &&
238 cur <= end - 8 /* = tag + size */) {
244 chunk_code = avio_rl32(pb);
245 chunk_size = avio_rl32(pb);
247 if (chunk_code || chunk_size) {
248 av_log(s, AV_LOG_WARNING, "INFO subchunk truncated\n");
249 return AVERROR_INVALIDDATA;
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;
265 chunk_size += (chunk_size & 1);
269 avio_skip(pb, chunk_size);
270 else if (pb->eof_reached) {
271 av_log(s, AV_LOG_WARNING, "truncated file\n");
277 value = av_mallocz(chunk_size + 1);
279 av_log(s, AV_LOG_ERROR,
280 "out of memory, unable to read INFO tag\n");
281 return AVERROR(ENOMEM);
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
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");
294 av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);