asfdec: Account for different Format Data sizes
[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, AVCodecParameters *par)
58 {
59 ff_asf_guid subformat;
60 int bps;
61
62 bps = avio_rl16(pb);
63 if (bps)
64 par->bits_per_coded_sample = bps;
65 par->channel_layout = avio_rl32(pb); /* dwChannelMask */
66
67 ff_get_guid(pb, &subformat);
68 if (!memcmp(subformat + 4,
69 (const uint8_t[]){ FF_MEDIASUBTYPE_BASE_GUID }, 12)) {
70 par->codec_tag = AV_RL32(subformat);
71 par->codec_id = ff_wav_codec_get_id(par->codec_tag,
72 par->bits_per_coded_sample);
73 } else {
74 par->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subformat);
75 if (!par->codec_id)
76 av_log(pb, AV_LOG_WARNING,
77 "unknown subformat:"FF_PRI_GUID"\n",
78 FF_ARG_GUID(subformat));
79 }
80 }
81
82 int ff_get_wav_header(AVFormatContext *s, AVIOContext *pb,
83 AVCodecParameters *par, int size)
84 {
85 int id;
86 uint64_t bitrate;
87
88 if (size < 14)
89 return AVERROR_INVALIDDATA;
90
91 id = avio_rl16(pb);
92 par->codec_type = AVMEDIA_TYPE_AUDIO;
93 par->channels = avio_rl16(pb);
94 par->sample_rate = avio_rl32(pb);
95 bitrate = avio_rl32(pb) * 8;
96 par->block_align = avio_rl16(pb);
97 if (size == 14) { /* We're dealing with plain vanilla WAVEFORMAT */
98 par->bits_per_coded_sample = 8;
99 } else
100 par->bits_per_coded_sample = avio_rl16(pb);
101 if (id == 0xFFFE) {
102 par->codec_tag = 0;
103 } else {
104 par->codec_tag = id;
105 par->codec_id = ff_wav_codec_get_id(id, par->bits_per_coded_sample);
106 }
107 if (size >= 18) { /* We're obviously dealing with WAVEFORMATEX */
108 int cbSize = avio_rl16(pb); /* cbSize */
109 size -= 18;
110 cbSize = FFMIN(size, cbSize);
111 if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
112 parse_waveformatex(pb, par);
113 cbSize -= 22;
114 size -= 22;
115 }
116 par->extradata_size = cbSize;
117 if (cbSize > 0) {
118 av_free(par->extradata);
119 par->extradata = av_mallocz(par->extradata_size +
120 AV_INPUT_BUFFER_PADDING_SIZE);
121 if (!par->extradata)
122 return AVERROR(ENOMEM);
123 avio_read(pb, par->extradata, par->extradata_size);
124 size -= cbSize;
125 }
126
127 /* It is possible for the chunk to contain garbage at the end */
128 if (size > 0)
129 avio_skip(pb, size);
130 }
131
132 if (bitrate > INT_MAX) {
133 if (s->error_recognition & AV_EF_EXPLODE) {
134 av_log(s, AV_LOG_ERROR,
135 "The bitrate %"PRIu64" is too large.\n",
136 bitrate);
137 return AVERROR_INVALIDDATA;
138 } else {
139 av_log(s, AV_LOG_WARNING,
140 "The bitrate %"PRIu64" is too large, resetting to 0.",
141 bitrate);
142 par->bit_rate = 0;
143 }
144 } else {
145 par->bit_rate = bitrate;
146 }
147
148 if (par->sample_rate <= 0) {
149 av_log(s, AV_LOG_ERROR,
150 "Invalid sample rate: %d\n", par->sample_rate);
151 return AVERROR_INVALIDDATA;
152 }
153 if (par->codec_id == AV_CODEC_ID_AAC_LATM) {
154 /* Channels and sample_rate values are those prior to applying SBR
155 * and/or PS. */
156 par->channels = 0;
157 par->sample_rate = 0;
158 }
159 /* override bits_per_coded_sample for G.726 */
160 if (par->codec_id == AV_CODEC_ID_ADPCM_G726)
161 par->bits_per_coded_sample = par->bit_rate / par->sample_rate;
162
163 return 0;
164 }
165
166 enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
167 {
168 enum AVCodecID id;
169 id = ff_codec_get_id(ff_codec_wav_tags, tag);
170 if (id <= 0)
171 return id;
172
173 if (id == AV_CODEC_ID_PCM_S16LE)
174 id = ff_get_pcm_codec_id(bps, 0, 0, ~1);
175 else if (id == AV_CODEC_ID_PCM_F32LE)
176 id = ff_get_pcm_codec_id(bps, 1, 0, 0);
177
178 if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8)
179 id = AV_CODEC_ID_PCM_ZORK;
180 return id;
181 }
182
183 int ff_get_bmp_header(AVIOContext *pb, AVStream *st, uint32_t *size)
184 {
185 int tag1;
186 uint32_t size_ = avio_rl32(pb);
187 if (size)
188 *size = size_;
189 st->codecpar->width = avio_rl32(pb);
190 st->codecpar->height = (int32_t)avio_rl32(pb);
191 avio_rl16(pb); /* planes */
192 st->codecpar->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 */
199 return tag1;
200 }
201
202 int ff_read_riff_info(AVFormatContext *s, int64_t size)
203 {
204 int64_t start, end, cur;
205 AVIOContext *pb = s->pb;
206
207 start = avio_tell(pb);
208 end = start + size;
209
210 while ((cur = avio_tell(pb)) >= 0 &&
211 cur <= end - 8 /* = tag + size */) {
212 uint32_t chunk_code;
213 int64_t chunk_size;
214 char key[5] = { 0 };
215 char *value;
216
217 chunk_code = avio_rl32(pb);
218 chunk_size = avio_rl32(pb);
219
220 if (chunk_size > end ||
221 end - chunk_size < cur ||
222 chunk_size == UINT_MAX) {
223 av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n");
224 break;
225 }
226
227 chunk_size += (chunk_size & 1);
228
229 if (!chunk_code) {
230 if (chunk_size)
231 avio_skip(pb, chunk_size);
232 else if (pb->eof_reached) {
233 av_log(s, AV_LOG_WARNING, "truncated file\n");
234 return AVERROR_EOF;
235 }
236 continue;
237 }
238
239 value = av_malloc(chunk_size + 1);
240 if (!value) {
241 av_log(s, AV_LOG_ERROR,
242 "out of memory, unable to read INFO tag\n");
243 return AVERROR(ENOMEM);
244 }
245
246 AV_WL32(key, chunk_code);
247
248 if (avio_read(pb, value, chunk_size) != chunk_size) {
249 av_free(value);
250 av_log(s, AV_LOG_WARNING,
251 "premature end of file while reading INFO tag\n");
252 break;
253 }
254
255 value[chunk_size] = 0;
256
257 av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
258 }
259
260 return 0;
261 }