2 * RIFF demuxing functions and data
3 * Copyright (c) 2000 Fabrice Bellard
5 * This file is part of Libav.
7 * Libav 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 * Libav 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 Libav; 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 const AVCodecGuid ff_codec_wav_guids[] = {
33 { AV_CODEC_ID_AC3, { 0x2C, 0x80, 0x6D, 0xE0, 0x46, 0xDB, 0xCF, 0x11, 0xB4, 0xD1, 0x00, 0x80, 0x5F, 0x6C, 0xBB, 0xEA } },
34 { AV_CODEC_ID_ATRAC3P, { 0xBF, 0xAA, 0x23, 0xE9, 0x58, 0xCB, 0x71, 0x44, 0xA1, 0x19, 0xFF, 0xFA, 0x01, 0xE4, 0xCE, 0x62 } },
35 { AV_CODEC_ID_EAC3, { 0xAF, 0x87, 0xFB, 0xA7, 0x02, 0x2D, 0xFB, 0x42, 0xA4, 0xD4, 0x05, 0xCD, 0x93, 0x84, 0x3B, 0xDD } },
36 { AV_CODEC_ID_MP2, { 0x2B, 0x80, 0x6D, 0xE0, 0x46, 0xDB, 0xCF, 0x11, 0xB4, 0xD1, 0x00, 0x80, 0x5F, 0x6C, 0xBB, 0xEA } },
40 enum AVCodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
43 for (i = 0; guids[i].id != AV_CODEC_ID_NONE; i++)
44 if (!ff_guidcmp(guids[i].guid, guid))
46 return AV_CODEC_ID_NONE;
49 /* We could be given one of the three possible structures here:
50 * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
51 * is an expansion of the previous one with the fields added
52 * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
53 * WAVEFORMATEX adds 'WORD cbSize' and basically makes itself
54 * an openended structure.
57 static void parse_waveformatex(AVIOContext *pb, AVCodecContext *c)
59 ff_asf_guid subformat;
60 c->bits_per_coded_sample = avio_rl16(pb);
61 c->channel_layout = avio_rl32(pb); /* dwChannelMask */
63 ff_get_guid(pb, &subformat);
64 if (!memcmp(subformat + 4,
65 (const uint8_t[]){ FF_MEDIASUBTYPE_BASE_GUID }, 12)) {
66 c->codec_tag = AV_RL32(subformat);
67 c->codec_id = ff_wav_codec_get_id(c->codec_tag,
68 c->bits_per_coded_sample);
70 c->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subformat);
72 av_log(c, AV_LOG_WARNING,
73 "unknown subformat:"FF_PRI_GUID"\n",
74 FF_ARG_GUID(subformat));
78 int ff_get_wav_header(AVFormatContext *s, AVIOContext *pb,
79 AVCodecContext *codec, int size)
85 return AVERROR_INVALIDDATA;
88 codec->codec_type = AVMEDIA_TYPE_AUDIO;
89 codec->channels = avio_rl16(pb);
90 codec->sample_rate = avio_rl32(pb);
91 bitrate = avio_rl32(pb) * 8;
92 codec->block_align = avio_rl16(pb);
93 if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
94 codec->bits_per_coded_sample = 8;
96 codec->bits_per_coded_sample = avio_rl16(pb);
100 codec->codec_tag = id;
101 codec->codec_id = ff_wav_codec_get_id(id,
102 codec->bits_per_coded_sample);
104 if (size >= 18) { /* We're obviously dealing with WAVEFORMATEX */
105 int cbSize = avio_rl16(pb); /* cbSize */
107 cbSize = FFMIN(size, cbSize);
108 if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
109 parse_waveformatex(pb, codec);
113 codec->extradata_size = cbSize;
115 av_free(codec->extradata);
116 codec->extradata = av_mallocz(codec->extradata_size +
117 AV_INPUT_BUFFER_PADDING_SIZE);
118 if (!codec->extradata)
119 return AVERROR(ENOMEM);
120 avio_read(pb, codec->extradata, codec->extradata_size);
124 /* It is possible for the chunk to contain garbage at the end */
129 if (bitrate > INT_MAX) {
130 if (s->error_recognition & AV_EF_EXPLODE) {
131 av_log(s, AV_LOG_ERROR,
132 "The bitrate %"PRIu64" is too large.\n",
134 return AVERROR_INVALIDDATA;
136 av_log(s, AV_LOG_WARNING,
137 "The bitrate %"PRIu64" is too large, resetting to 0.",
142 codec->bit_rate = bitrate;
145 if (codec->sample_rate <= 0) {
146 av_log(s, AV_LOG_ERROR,
147 "Invalid sample rate: %d\n", codec->sample_rate);
148 return AVERROR_INVALIDDATA;
150 if (codec->codec_id == AV_CODEC_ID_AAC_LATM) {
151 /* Channels and sample_rate values are those prior to applying SBR
154 codec->sample_rate = 0;
156 /* override bits_per_coded_sample for G.726 */
157 if (codec->codec_id == AV_CODEC_ID_ADPCM_G726)
158 codec->bits_per_coded_sample = codec->bit_rate / codec->sample_rate;
163 enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
166 id = ff_codec_get_id(ff_codec_wav_tags, tag);
170 if (id == AV_CODEC_ID_PCM_S16LE)
171 id = ff_get_pcm_codec_id(bps, 0, 0, ~1);
172 else if (id == AV_CODEC_ID_PCM_F32LE)
173 id = ff_get_pcm_codec_id(bps, 1, 0, 0);
175 if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8)
176 id = AV_CODEC_ID_PCM_ZORK;
180 int ff_get_bmp_header(AVIOContext *pb, AVStream *st)
183 avio_rl32(pb); /* size */
184 st->codec->width = avio_rl32(pb);
185 st->codec->height = (int32_t)avio_rl32(pb);
186 avio_rl16(pb); /* planes */
187 st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */
188 tag1 = avio_rl32(pb);
189 avio_rl32(pb); /* ImageSize */
190 avio_rl32(pb); /* XPelsPerMeter */
191 avio_rl32(pb); /* YPelsPerMeter */
192 avio_rl32(pb); /* ClrUsed */
193 avio_rl32(pb); /* ClrImportant */
197 int ff_read_riff_info(AVFormatContext *s, int64_t size)
199 int64_t start, end, cur;
200 AVIOContext *pb = s->pb;
202 start = avio_tell(pb);
205 while ((cur = avio_tell(pb)) >= 0 &&
206 cur <= end - 8 /* = tag + size */) {
212 chunk_code = avio_rl32(pb);
213 chunk_size = avio_rl32(pb);
215 if (chunk_size > end ||
216 end - chunk_size < cur ||
217 chunk_size == UINT_MAX) {
218 av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n");
222 chunk_size += (chunk_size & 1);
226 avio_skip(pb, chunk_size);
227 else if (pb->eof_reached) {
228 av_log(s, AV_LOG_WARNING, "truncated file\n");
234 value = av_malloc(chunk_size + 1);
236 av_log(s, AV_LOG_ERROR,
237 "out of memory, unable to read INFO tag\n");
238 return AVERROR(ENOMEM);
241 AV_WL32(key, chunk_code);
243 if (avio_read(pb, value, chunk_size) != chunk_size) {
245 av_log(s, AV_LOG_WARNING,
246 "premature end of file while reading INFO tag\n");
250 value[chunk_size] = 0;
252 av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);