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;
64 int bps = avio_rl16(pb);
66 par->bits_per_coded_sample = bps;
68 par->channel_layout = avio_rl32(pb); /* dwChannelMask */
70 ff_get_guid(pb, &subformat);
71 if (!memcmp(subformat + 4,
72 (const uint8_t[]){ FF_AMBISONIC_BASE_GUID }, 12) ||
73 !memcmp(subformat + 4,
74 (const uint8_t[]){ FF_MEDIASUBTYPE_BASE_GUID }, 12)) {
75 par->codec_tag = AV_RL32(subformat);
76 par->codec_id = ff_wav_codec_get_id(par->codec_tag,
77 par->bits_per_coded_sample);
79 par->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subformat);
81 av_log(pb, AV_LOG_WARNING,
82 "unknown subformat:"FF_PRI_GUID"\n",
83 FF_ARG_GUID(subformat));
87 /* "big_endian" values are needed for RIFX file format */
88 int ff_get_wav_header(AVFormatContext *s, AVIOContext *pb,
89 AVCodecParameters *par, int size, int big_endian)
95 avpriv_request_sample(s, "wav header size < 14");
96 return AVERROR_INVALIDDATA;
99 par->codec_type = AVMEDIA_TYPE_AUDIO;
103 par->channels = avio_rl16(pb);
104 par->sample_rate = avio_rl32(pb);
105 bitrate = avio_rl32(pb) * 8LL;
106 par->block_align = avio_rl16(pb);
110 par->channels = avio_rb16(pb);
111 par->sample_rate = avio_rb32(pb);
112 bitrate = avio_rb32(pb) * 8LL;
113 par->block_align = avio_rb16(pb);
115 if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
116 par->bits_per_coded_sample = 8;
119 par->bits_per_coded_sample = avio_rl16(pb);
121 par->bits_per_coded_sample = avio_rb16(pb);
128 par->codec_id = ff_wav_codec_get_id(id,
129 par->bits_per_coded_sample);
131 if (size >= 18 && id != 0x0165) { /* We're obviously dealing with WAVEFORMATEX */
132 int cbSize = avio_rl16(pb); /* cbSize */
134 avpriv_report_missing_feature(s, "WAVEFORMATEX support for RIFX files");
135 return AVERROR_PATCHWELCOME;
138 cbSize = FFMIN(size, cbSize);
139 if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
140 parse_waveformatex(pb, par);
145 av_freep(&par->extradata);
146 if (ff_get_extradata(s, par, pb, cbSize) < 0)
147 return AVERROR(ENOMEM);
151 /* It is possible for the chunk to contain garbage at the end */
154 } else if (id == 0x0165 && size >= 32) {
158 av_freep(&par->extradata);
159 if (ff_get_extradata(s, par, pb, size) < 0)
160 return AVERROR(ENOMEM);
161 nb_streams = AV_RL16(par->extradata + 4);
162 par->sample_rate = AV_RL32(par->extradata + 12);
165 if (size < 8 + nb_streams * 20)
166 return AVERROR_INVALIDDATA;
167 for (i = 0; i < nb_streams; i++)
168 par->channels += par->extradata[8 + i * 20 + 17];
171 par->bit_rate = bitrate;
173 if (par->sample_rate <= 0) {
174 av_log(s, AV_LOG_ERROR,
175 "Invalid sample rate: %d\n", par->sample_rate);
176 return AVERROR_INVALIDDATA;
178 if (par->codec_id == AV_CODEC_ID_AAC_LATM) {
179 /* Channels and sample_rate values are those prior to applying SBR
182 par->sample_rate = 0;
184 /* override bits_per_coded_sample for G.726 */
185 if (par->codec_id == AV_CODEC_ID_ADPCM_G726 && par->sample_rate)
186 par->bits_per_coded_sample = par->bit_rate / par->sample_rate;
191 enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
194 id = ff_codec_get_id(ff_codec_wav_tags, tag);
198 if (id == AV_CODEC_ID_PCM_S16LE)
199 id = ff_get_pcm_codec_id(bps, 0, 0, ~1);
200 else if (id == AV_CODEC_ID_PCM_F32LE)
201 id = ff_get_pcm_codec_id(bps, 1, 0, 0);
203 if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8)
204 id = AV_CODEC_ID_PCM_ZORK;
208 int ff_get_bmp_header(AVIOContext *pb, AVStream *st, unsigned *esize)
211 if(esize) *esize = avio_rl32(pb);
213 st->codecpar->width = avio_rl32(pb);
214 st->codecpar->height = (int32_t)avio_rl32(pb);
215 avio_rl16(pb); /* planes */
216 st->codecpar->bits_per_coded_sample = avio_rl16(pb); /* depth */
217 tag1 = avio_rl32(pb);
218 avio_rl32(pb); /* ImageSize */
219 avio_rl32(pb); /* XPelsPerMeter */
220 avio_rl32(pb); /* YPelsPerMeter */
221 avio_rl32(pb); /* ClrUsed */
222 avio_rl32(pb); /* ClrImportant */
226 int ff_read_riff_info(AVFormatContext *s, int64_t size)
228 int64_t start, end, cur;
229 AVIOContext *pb = s->pb;
231 start = avio_tell(pb);
234 while ((cur = avio_tell(pb)) >= 0 &&
235 cur <= end - 8 /* = tag + size */) {
241 chunk_code = avio_rl32(pb);
242 chunk_size = avio_rl32(pb);
244 if (chunk_code || chunk_size) {
245 av_log(s, AV_LOG_WARNING, "INFO subchunk truncated\n");
246 return AVERROR_INVALIDDATA;
250 if (chunk_size > end ||
251 end - chunk_size < cur ||
252 chunk_size == UINT_MAX) {
253 avio_seek(pb, -9, SEEK_CUR);
254 chunk_code = avio_rl32(pb);
255 chunk_size = avio_rl32(pb);
256 if (chunk_size > end || end - chunk_size < cur || chunk_size == UINT_MAX) {
257 av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n");
258 return AVERROR_INVALIDDATA;
262 chunk_size += (chunk_size & 1);
266 avio_skip(pb, chunk_size);
267 else if (pb->eof_reached) {
268 av_log(s, AV_LOG_WARNING, "truncated file\n");
274 value = av_mallocz(chunk_size + 1);
276 av_log(s, AV_LOG_ERROR,
277 "out of memory, unable to read INFO tag\n");
278 return AVERROR(ENOMEM);
281 AV_WL32(key, chunk_code);
282 // Work around VC++ 2015 Update 1 code-gen bug:
283 // https://connect.microsoft.com/VisualStudio/feedback/details/2291638
286 if (avio_read(pb, value, chunk_size) != chunk_size) {
287 av_log(s, AV_LOG_WARNING,
288 "premature end of file while reading INFO tag\n");
291 av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);