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, AVCodecContext *c)
63 ff_asf_guid subformat;
64 int bps = avio_rl16(pb);
66 c->bits_per_coded_sample = bps;
68 c->channel_layout = avio_rl32(pb); /* dwChannelMask */
70 ff_get_guid(pb, &subformat);
71 if (!memcmp(subformat + 4,
72 (const uint8_t[]){ FF_MEDIASUBTYPE_BASE_GUID }, 12)) {
73 c->codec_tag = AV_RL32(subformat);
74 c->codec_id = ff_wav_codec_get_id(c->codec_tag,
75 c->bits_per_coded_sample);
77 c->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subformat);
79 av_log(c, AV_LOG_WARNING,
80 "unknown subformat:"FF_PRI_GUID"\n",
81 FF_ARG_GUID(subformat));
85 /* "big_endian" values are needed for RIFX file format */
86 int ff_get_wav_header(AVIOContext *pb, AVCodecContext *codec, int size, int big_endian)
91 avpriv_request_sample(codec, "wav header size < 14");
92 return AVERROR_INVALIDDATA;
95 codec->codec_type = AVMEDIA_TYPE_AUDIO;
98 codec->channels = avio_rl16(pb);
99 codec->sample_rate = avio_rl32(pb);
100 codec->bit_rate = avio_rl32(pb) * 8;
101 codec->block_align = avio_rl16(pb);
104 codec->channels = avio_rb16(pb);
105 codec->sample_rate = avio_rb32(pb);
106 codec->bit_rate = avio_rb32(pb) * 8;
107 codec->block_align = avio_rb16(pb);
109 if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
110 codec->bits_per_coded_sample = 8;
113 codec->bits_per_coded_sample = avio_rl16(pb);
115 codec->bits_per_coded_sample = avio_rb16(pb);
119 codec->codec_tag = 0;
121 codec->codec_tag = id;
122 codec->codec_id = ff_wav_codec_get_id(id,
123 codec->bits_per_coded_sample);
125 if (size >= 18) { /* We're obviously dealing with WAVEFORMATEX */
126 int cbSize = avio_rl16(pb); /* cbSize */
128 avpriv_report_missing_feature(codec, "WAVEFORMATEX support for RIFX files\n");
129 return AVERROR_PATCHWELCOME;
132 cbSize = FFMIN(size, cbSize);
133 if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
134 parse_waveformatex(pb, codec);
139 av_freep(&codec->extradata);
140 if (ff_get_extradata(codec, pb, cbSize) < 0)
141 return AVERROR(ENOMEM);
145 /* It is possible for the chunk to contain garbage at the end */
149 if (codec->sample_rate <= 0) {
150 av_log(NULL, AV_LOG_ERROR,
151 "Invalid sample rate: %d\n", codec->sample_rate);
152 return AVERROR_INVALIDDATA;
154 if (codec->codec_id == AV_CODEC_ID_AAC_LATM) {
155 /* Channels and sample_rate values are those prior to applying SBR
158 codec->sample_rate = 0;
160 /* override bits_per_coded_sample for G.726 */
161 if (codec->codec_id == AV_CODEC_ID_ADPCM_G726 && codec->sample_rate)
162 codec->bits_per_coded_sample = codec->bit_rate / codec->sample_rate;
167 enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
170 id = ff_codec_get_id(ff_codec_wav_tags, tag);
174 if (id == AV_CODEC_ID_PCM_S16LE)
175 id = ff_get_pcm_codec_id(bps, 0, 0, ~1);
176 else if (id == AV_CODEC_ID_PCM_F32LE)
177 id = ff_get_pcm_codec_id(bps, 1, 0, 0);
179 if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8)
180 id = AV_CODEC_ID_PCM_ZORK;
184 int ff_get_bmp_header(AVIOContext *pb, AVStream *st, unsigned *esize)
187 if(esize) *esize = avio_rl32(pb);
189 st->codec->width = avio_rl32(pb);
190 st->codec->height = (int32_t)avio_rl32(pb);
191 avio_rl16(pb); /* planes */
192 st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */
193 tag1 = avio_rl32(pb);
194 avio_rl32(pb); /* ImageSize */
195 avio_rl32(pb); /* XPelsPerMeter */
196 avio_rl32(pb); /* YPelsPerMeter */
197 avio_rl32(pb); /* ClrUsed */
198 avio_rl32(pb); /* ClrImportant */
202 int ff_read_riff_info(AVFormatContext *s, int64_t size)
204 int64_t start, end, cur;
205 AVIOContext *pb = s->pb;
207 start = avio_tell(pb);
210 while ((cur = avio_tell(pb)) >= 0 &&
211 cur <= end - 8 /* = tag + size */) {
217 chunk_code = avio_rl32(pb);
218 chunk_size = avio_rl32(pb);
220 if (chunk_code || chunk_size) {
221 av_log(s, AV_LOG_WARNING, "INFO subchunk truncated\n");
222 return AVERROR_INVALIDDATA;
226 if (chunk_size > end ||
227 end - chunk_size < cur ||
228 chunk_size == UINT_MAX) {
229 avio_seek(pb, -9, SEEK_CUR);
230 chunk_code = avio_rl32(pb);
231 chunk_size = avio_rl32(pb);
232 if (chunk_size > end || end - chunk_size < cur || chunk_size == UINT_MAX) {
233 av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n");
234 return AVERROR_INVALIDDATA;
238 chunk_size += (chunk_size & 1);
242 avio_skip(pb, chunk_size);
243 else if (pb->eof_reached) {
244 av_log(s, AV_LOG_WARNING, "truncated file\n");
250 value = av_mallocz(chunk_size + 1);
252 av_log(s, AV_LOG_ERROR,
253 "out of memory, unable to read INFO tag\n");
254 return AVERROR(ENOMEM);
257 AV_WL32(key, chunk_code);
259 if (avio_read(pb, value, chunk_size) != chunk_size) {
260 av_log(s, AV_LOG_WARNING,
261 "premature end of file while reading INFO tag\n");
264 av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);