riff: Move demuxing code to a separate file.
[libav.git] / libavformat / riffdec.c
1 /*
2 * RIFF demuxing functions and data
3 * Copyright (c) 2000 Fabrice Bellard
4 *
5 * This file is part of Libav.
6 *
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.
11 *
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.
16 *
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
20 */
21
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"
28 #include "avformat.h"
29 #include "avio_internal.h"
30 #include "riff.h"
31
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 } },
37 { AV_CODEC_ID_NONE }
38 };
39
40 enum AVCodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
41 {
42 int i;
43 for (i = 0; guids[i].id != AV_CODEC_ID_NONE; i++)
44 if (!ff_guidcmp(guids[i].guid, guid))
45 return guids[i].id;
46 return AV_CODEC_ID_NONE;
47 }
48
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.
55 */
56
57 static void parse_waveformatex(AVIOContext *pb, AVCodecContext *c)
58 {
59 ff_asf_guid subformat;
60 c->bits_per_coded_sample = avio_rl16(pb);
61 c->channel_layout = avio_rl32(pb); /* dwChannelMask */
62
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);
69 } else {
70 c->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subformat);
71 if (!c->codec_id)
72 av_log(c, AV_LOG_WARNING,
73 "unknown subformat:"FF_PRI_GUID"\n",
74 FF_ARG_GUID(subformat));
75 }
76 }
77
78 int ff_get_wav_header(AVIOContext *pb, AVCodecContext *codec, int size)
79 {
80 int id;
81
82 id = avio_rl16(pb);
83 codec->codec_type = AVMEDIA_TYPE_AUDIO;
84 codec->channels = avio_rl16(pb);
85 codec->sample_rate = avio_rl32(pb);
86 codec->bit_rate = avio_rl32(pb) * 8;
87 codec->block_align = avio_rl16(pb);
88 if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
89 codec->bits_per_coded_sample = 8;
90 } else
91 codec->bits_per_coded_sample = avio_rl16(pb);
92 if (id == 0xFFFE) {
93 codec->codec_tag = 0;
94 } else {
95 codec->codec_tag = id;
96 codec->codec_id = ff_wav_codec_get_id(id,
97 codec->bits_per_coded_sample);
98 }
99 if (size >= 18) { /* We're obviously dealing with WAVEFORMATEX */
100 int cbSize = avio_rl16(pb); /* cbSize */
101 size -= 18;
102 cbSize = FFMIN(size, cbSize);
103 if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
104 parse_waveformatex(pb, codec);
105 cbSize -= 22;
106 size -= 22;
107 }
108 codec->extradata_size = cbSize;
109 if (cbSize > 0) {
110 av_free(codec->extradata);
111 codec->extradata = av_mallocz(codec->extradata_size +
112 FF_INPUT_BUFFER_PADDING_SIZE);
113 if (!codec->extradata)
114 return AVERROR(ENOMEM);
115 avio_read(pb, codec->extradata, codec->extradata_size);
116 size -= cbSize;
117 }
118
119 /* It is possible for the chunk to contain garbage at the end */
120 if (size > 0)
121 avio_skip(pb, size);
122 }
123 if (codec->codec_id == AV_CODEC_ID_AAC_LATM) {
124 /* Channels and sample_rate values are those prior to applying SBR
125 * and/or PS. */
126 codec->channels = 0;
127 codec->sample_rate = 0;
128 }
129 /* override bits_per_coded_sample for G.726 */
130 if (codec->codec_id == AV_CODEC_ID_ADPCM_G726)
131 codec->bits_per_coded_sample = codec->bit_rate / codec->sample_rate;
132
133 return 0;
134 }
135
136 enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
137 {
138 enum AVCodecID id;
139 id = ff_codec_get_id(ff_codec_wav_tags, tag);
140 if (id <= 0)
141 return id;
142
143 if (id == AV_CODEC_ID_PCM_S16LE)
144 id = ff_get_pcm_codec_id(bps, 0, 0, ~1);
145 else if (id == AV_CODEC_ID_PCM_F32LE)
146 id = ff_get_pcm_codec_id(bps, 1, 0, 0);
147
148 if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8)
149 id = AV_CODEC_ID_PCM_ZORK;
150 return id;
151 }
152
153 int ff_get_bmp_header(AVIOContext *pb, AVStream *st)
154 {
155 int tag1;
156 avio_rl32(pb); /* size */
157 st->codec->width = avio_rl32(pb);
158 st->codec->height = (int32_t)avio_rl32(pb);
159 avio_rl16(pb); /* planes */
160 st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */
161 tag1 = avio_rl32(pb);
162 avio_rl32(pb); /* ImageSize */
163 avio_rl32(pb); /* XPelsPerMeter */
164 avio_rl32(pb); /* YPelsPerMeter */
165 avio_rl32(pb); /* ClrUsed */
166 avio_rl32(pb); /* ClrImportant */
167 return tag1;
168 }
169
170 int ff_read_riff_info(AVFormatContext *s, int64_t size)
171 {
172 int64_t start, end, cur;
173 AVIOContext *pb = s->pb;
174
175 start = avio_tell(pb);
176 end = start + size;
177
178 while ((cur = avio_tell(pb)) >= 0 &&
179 cur <= end - 8 /* = tag + size */) {
180 uint32_t chunk_code;
181 int64_t chunk_size;
182 char key[5] = { 0 };
183 char *value;
184
185 chunk_code = avio_rl32(pb);
186 chunk_size = avio_rl32(pb);
187
188 if (chunk_size > end ||
189 end - chunk_size < cur ||
190 chunk_size == UINT_MAX) {
191 av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n");
192 break;
193 }
194
195 chunk_size += (chunk_size & 1);
196
197 if (!chunk_code) {
198 if (chunk_size)
199 avio_skip(pb, chunk_size);
200 else if (pb->eof_reached) {
201 av_log(s, AV_LOG_WARNING, "truncated file\n");
202 return AVERROR_EOF;
203 }
204 continue;
205 }
206
207 value = av_malloc(chunk_size + 1);
208 if (!value) {
209 av_log(s, AV_LOG_ERROR,
210 "out of memory, unable to read INFO tag\n");
211 return AVERROR(ENOMEM);
212 }
213
214 AV_WL32(key, chunk_code);
215
216 if (avio_read(pb, value, chunk_size) != chunk_size) {
217 av_free(value);
218 av_log(s, AV_LOG_WARNING,
219 "premature end of file while reading INFO tag\n");
220 break;
221 }
222
223 value[chunk_size] = 0;
224
225 av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
226 }
227
228 return 0;
229 }