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/avassert.h"
23 #include "libavutil/dict.h"
24 #include "libavutil/error.h"
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/log.h"
28 #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 = ffio_read_size(s, *g, sizeof(*g));
38 memset(*g, 0, sizeof(*g));
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(void *logctx, AVIOContext *pb, AVCodecParameters *par)
63 ff_asf_guid subformat;
69 par->bits_per_coded_sample = bps;
71 mask = avio_rl32(pb); /* dwChannelMask */
72 av_channel_layout_from_mask(&par->ch_layout, mask);
74 ff_get_guid(pb, &subformat);
75 if (!memcmp(subformat + 4,
76 (const uint8_t[]){ FF_AMBISONIC_BASE_GUID }, 12) ||
77 !memcmp(subformat + 4,
78 (const uint8_t[]){ FF_BROKEN_BASE_GUID }, 12) ||
79 !memcmp(subformat + 4,
80 (const uint8_t[]){ FF_MEDIASUBTYPE_BASE_GUID }, 12)) {
81 par->codec_tag = AV_RL32(subformat);
82 par->codec_id = ff_wav_codec_get_id(par->codec_tag,
83 par->bits_per_coded_sample);
85 par->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subformat);
87 av_log(logctx, AV_LOG_WARNING,
88 "unknown subformat:"FF_PRI_GUID"\n",
89 FF_ARG_GUID(subformat));
93 /* "big_endian" values are needed for RIFX file format */
94 int ff_get_wav_header(void *logctx, AVIOContext *pb,
95 AVCodecParameters *par, int size, int big_endian)
97 int id, channels = 0, ret;
101 avpriv_request_sample(logctx, "wav header size < 14");
102 return AVERROR_INVALIDDATA;
105 av_channel_layout_uninit(&par->ch_layout);
107 par->codec_type = AVMEDIA_TYPE_AUDIO;
111 channels = avio_rl16(pb);
112 par->sample_rate = avio_rl32(pb);
113 bitrate = avio_rl32(pb) * 8LL;
114 par->block_align = avio_rl16(pb);
118 channels = avio_rb16(pb);
119 par->sample_rate = avio_rb32(pb);
120 bitrate = avio_rb32(pb) * 8LL;
121 par->block_align = avio_rb16(pb);
123 if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
124 par->bits_per_coded_sample = 8;
127 par->bits_per_coded_sample = avio_rl16(pb);
129 par->bits_per_coded_sample = avio_rb16(pb);
136 par->codec_id = ff_wav_codec_get_id(id,
137 par->bits_per_coded_sample);
139 if (size >= 18 && id != 0x0165) { /* We're obviously dealing with WAVEFORMATEX */
140 int cbSize = avio_rl16(pb); /* cbSize */
142 avpriv_report_missing_feature(logctx, "WAVEFORMATEX support for RIFX files");
143 return AVERROR_PATCHWELCOME;
146 cbSize = FFMIN(size, cbSize);
147 if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
148 parse_waveformatex(logctx, pb, par);
153 ret = ff_get_extradata(logctx, par, pb, cbSize);
159 /* It is possible for the chunk to contain garbage at the end */
162 } else if (id == 0x0165 && size >= 32) {
166 ret = ff_get_extradata(logctx, par, pb, size);
169 nb_streams = AV_RL16(par->extradata + 4);
170 par->sample_rate = AV_RL32(par->extradata + 12);
173 if (size < 8 + nb_streams * 20)
174 return AVERROR_INVALIDDATA;
175 for (i = 0; i < nb_streams; i++)
176 channels += par->extradata[8 + i * 20 + 17];
179 par->bit_rate = bitrate;
181 if (par->sample_rate <= 0) {
182 av_log(logctx, AV_LOG_ERROR,
183 "Invalid sample rate: %d\n", par->sample_rate);
184 return AVERROR_INVALIDDATA;
186 if (par->codec_id == AV_CODEC_ID_AAC_LATM) {
187 /* Channels and sample_rate values are those prior to applying SBR
190 par->sample_rate = 0;
192 /* override bits_per_coded_sample for G.726 */
193 if (par->codec_id == AV_CODEC_ID_ADPCM_G726 && par->sample_rate)
194 par->bits_per_coded_sample = par->bit_rate / par->sample_rate;
196 /* ignore WAVEFORMATEXTENSIBLE layout if different from channel count */
197 if (channels != par->ch_layout.nb_channels) {
198 av_channel_layout_uninit(&par->ch_layout);
199 par->ch_layout.order = AV_CHANNEL_ORDER_UNSPEC;
200 par->ch_layout.nb_channels = channels;
206 enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
209 id = ff_codec_get_id(ff_codec_wav_tags, tag);
213 if (id == AV_CODEC_ID_PCM_S16LE)
214 id = ff_get_pcm_codec_id(bps, 0, 0, ~1);
215 else if (id == AV_CODEC_ID_PCM_F32LE)
216 id = ff_get_pcm_codec_id(bps, 1, 0, 0);
218 if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8)
219 id = AV_CODEC_ID_ADPCM_ZORK;
223 int ff_get_bmp_header(AVIOContext *pb, AVStream *st, uint32_t *size)
226 uint32_t size_ = avio_rl32(pb);
229 st->codecpar->width = avio_rl32(pb);
230 st->codecpar->height = (int32_t)avio_rl32(pb);
231 avio_rl16(pb); /* planes */
232 st->codecpar->bits_per_coded_sample = avio_rl16(pb); /* depth */
233 tag1 = avio_rl32(pb);
234 avio_rl32(pb); /* ImageSize */
235 avio_rl32(pb); /* XPelsPerMeter */
236 avio_rl32(pb); /* YPelsPerMeter */
237 avio_rl32(pb); /* ClrUsed */
238 avio_rl32(pb); /* ClrImportant */
242 int ff_read_riff_info(AVFormatContext *s, int64_t size)
244 int64_t start, end, cur;
245 AVIOContext *pb = s->pb;
247 start = avio_tell(pb);
250 while ((cur = avio_tell(pb)) >= 0 &&
251 cur <= end - 8 /* = tag + size */) {
257 chunk_code = avio_rl32(pb);
258 chunk_size = avio_rl32(pb);
260 if (chunk_code || chunk_size) {
261 av_log(s, AV_LOG_WARNING, "INFO subchunk truncated\n");
262 return AVERROR_INVALIDDATA;
266 if (chunk_size > end ||
267 end - chunk_size < cur ||
268 chunk_size == UINT_MAX) {
269 avio_seek(pb, -9, SEEK_CUR);
270 chunk_code = avio_rl32(pb);
271 chunk_size = avio_rl32(pb);
272 if (chunk_size > end || end - chunk_size < cur || chunk_size == UINT_MAX) {
273 av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n");
274 return AVERROR_INVALIDDATA;
278 chunk_size += (chunk_size & 1);
282 avio_skip(pb, chunk_size);
283 else if (pb->eof_reached) {
284 av_log(s, AV_LOG_WARNING, "truncated file\n");
290 value = av_mallocz(chunk_size + 1);
292 av_log(s, AV_LOG_ERROR,
293 "out of memory, unable to read INFO tag\n");
294 return AVERROR(ENOMEM);
297 AV_WL32(key, chunk_code);
298 // Work around VC++ 2015 Update 1 code-gen bug:
299 // https://connect.microsoft.com/VisualStudio/feedback/details/2291638
302 if (avio_read(pb, value, chunk_size) != chunk_size) {
303 av_log(s, AV_LOG_WARNING,
304 "premature end of file while reading INFO tag\n");
307 av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);