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2ba45a60 DM |
1 | /* |
2 | * RIFF demuxing functions and data | |
3 | * Copyright (c) 2000 Fabrice Bellard | |
4 | * | |
5 | * This file is part of FFmpeg. | |
6 | * | |
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. | |
11 | * | |
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. | |
16 | * | |
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 | |
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 | int ff_get_guid(AVIOContext *s, ff_asf_guid *g) | |
33 | { | |
34 | av_assert0(sizeof(*g) == 16); //compiler will optimize this out | |
35 | if (avio_read(s, *g, sizeof(*g)) < (int)sizeof(*g)) { | |
36 | memset(*g, 0, sizeof(*g)); | |
37 | return AVERROR_INVALIDDATA; | |
38 | } | |
39 | return 0; | |
40 | } | |
41 | ||
42 | enum AVCodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid) | |
43 | { | |
44 | int i; | |
45 | for (i = 0; guids[i].id != AV_CODEC_ID_NONE; i++) | |
46 | if (!ff_guidcmp(guids[i].guid, guid)) | |
47 | return guids[i].id; | |
48 | return AV_CODEC_ID_NONE; | |
49 | } | |
50 | ||
51 | /* We could be given one of the three possible structures here: | |
52 | * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure | |
53 | * is an expansion of the previous one with the fields added | |
54 | * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and | |
55 | * WAVEFORMATEX adds 'WORD cbSize' and basically makes itself | |
56 | * an openended structure. | |
57 | */ | |
58 | ||
59 | static void parse_waveformatex(AVIOContext *pb, AVCodecContext *c) | |
60 | { | |
61 | ff_asf_guid subformat; | |
62 | int bps = avio_rl16(pb); | |
63 | if (bps) | |
64 | c->bits_per_coded_sample = bps; | |
65 | ||
66 | c->channel_layout = avio_rl32(pb); /* dwChannelMask */ | |
67 | ||
68 | ff_get_guid(pb, &subformat); | |
69 | if (!memcmp(subformat + 4, | |
70 | (const uint8_t[]){ FF_MEDIASUBTYPE_BASE_GUID }, 12)) { | |
71 | c->codec_tag = AV_RL32(subformat); | |
72 | c->codec_id = ff_wav_codec_get_id(c->codec_tag, | |
73 | c->bits_per_coded_sample); | |
74 | } else { | |
75 | c->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subformat); | |
76 | if (!c->codec_id) | |
77 | av_log(c, AV_LOG_WARNING, | |
78 | "unknown subformat:"FF_PRI_GUID"\n", | |
79 | FF_ARG_GUID(subformat)); | |
80 | } | |
81 | } | |
82 | ||
83 | int ff_get_wav_header(AVIOContext *pb, AVCodecContext *codec, int size) | |
84 | { | |
85 | int id; | |
86 | ||
87 | id = avio_rl16(pb); | |
88 | codec->codec_type = AVMEDIA_TYPE_AUDIO; | |
89 | codec->channels = avio_rl16(pb); | |
90 | codec->sample_rate = avio_rl32(pb); | |
91 | codec->bit_rate = 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; | |
95 | } else | |
96 | codec->bits_per_coded_sample = avio_rl16(pb); | |
97 | if (id == 0xFFFE) { | |
98 | codec->codec_tag = 0; | |
99 | } else { | |
100 | codec->codec_tag = id; | |
101 | codec->codec_id = ff_wav_codec_get_id(id, | |
102 | codec->bits_per_coded_sample); | |
103 | } | |
104 | if (size >= 18) { /* We're obviously dealing with WAVEFORMATEX */ | |
105 | int cbSize = avio_rl16(pb); /* cbSize */ | |
106 | size -= 18; | |
107 | cbSize = FFMIN(size, cbSize); | |
108 | if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */ | |
109 | parse_waveformatex(pb, codec); | |
110 | cbSize -= 22; | |
111 | size -= 22; | |
112 | } | |
113 | if (cbSize > 0) { | |
114 | av_free(codec->extradata); | |
115 | if (ff_get_extradata(codec, pb, cbSize) < 0) | |
116 | return AVERROR(ENOMEM); | |
117 | size -= cbSize; | |
118 | } | |
119 | ||
120 | /* It is possible for the chunk to contain garbage at the end */ | |
121 | if (size > 0) | |
122 | avio_skip(pb, size); | |
123 | } | |
124 | if (codec->sample_rate <= 0) { | |
125 | av_log(NULL, AV_LOG_ERROR, | |
126 | "Invalid sample rate: %d\n", codec->sample_rate); | |
127 | return AVERROR_INVALIDDATA; | |
128 | } | |
129 | if (codec->codec_id == AV_CODEC_ID_AAC_LATM) { | |
130 | /* Channels and sample_rate values are those prior to applying SBR | |
131 | * and/or PS. */ | |
132 | codec->channels = 0; | |
133 | codec->sample_rate = 0; | |
134 | } | |
135 | /* override bits_per_coded_sample for G.726 */ | |
136 | if (codec->codec_id == AV_CODEC_ID_ADPCM_G726 && codec->sample_rate) | |
137 | codec->bits_per_coded_sample = codec->bit_rate / codec->sample_rate; | |
138 | ||
139 | return 0; | |
140 | } | |
141 | ||
142 | enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps) | |
143 | { | |
144 | enum AVCodecID id; | |
145 | id = ff_codec_get_id(ff_codec_wav_tags, tag); | |
146 | if (id <= 0) | |
147 | return id; | |
148 | ||
149 | if (id == AV_CODEC_ID_PCM_S16LE) | |
150 | id = ff_get_pcm_codec_id(bps, 0, 0, ~1); | |
151 | else if (id == AV_CODEC_ID_PCM_F32LE) | |
152 | id = ff_get_pcm_codec_id(bps, 1, 0, 0); | |
153 | ||
154 | if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8) | |
155 | id = AV_CODEC_ID_PCM_ZORK; | |
156 | return id; | |
157 | } | |
158 | ||
159 | int ff_get_bmp_header(AVIOContext *pb, AVStream *st, unsigned *esize) | |
160 | { | |
161 | int tag1; | |
162 | if(esize) *esize = avio_rl32(pb); | |
163 | else avio_rl32(pb); | |
164 | st->codec->width = avio_rl32(pb); | |
165 | st->codec->height = (int32_t)avio_rl32(pb); | |
166 | avio_rl16(pb); /* planes */ | |
167 | st->codec->bits_per_coded_sample = avio_rl16(pb); /* depth */ | |
168 | tag1 = avio_rl32(pb); | |
169 | avio_rl32(pb); /* ImageSize */ | |
170 | avio_rl32(pb); /* XPelsPerMeter */ | |
171 | avio_rl32(pb); /* YPelsPerMeter */ | |
172 | avio_rl32(pb); /* ClrUsed */ | |
173 | avio_rl32(pb); /* ClrImportant */ | |
174 | return tag1; | |
175 | } | |
176 | ||
177 | int ff_read_riff_info(AVFormatContext *s, int64_t size) | |
178 | { | |
179 | int64_t start, end, cur; | |
180 | AVIOContext *pb = s->pb; | |
181 | ||
182 | start = avio_tell(pb); | |
183 | end = start + size; | |
184 | ||
185 | while ((cur = avio_tell(pb)) >= 0 && | |
186 | cur <= end - 8 /* = tag + size */) { | |
187 | uint32_t chunk_code; | |
188 | int64_t chunk_size; | |
189 | char key[5] = { 0 }; | |
190 | char *value; | |
191 | ||
192 | chunk_code = avio_rl32(pb); | |
193 | chunk_size = avio_rl32(pb); | |
194 | if (avio_feof(pb)) { | |
195 | if (chunk_code || chunk_size) { | |
196 | av_log(s, AV_LOG_WARNING, "INFO subchunk truncated\n"); | |
197 | return AVERROR_INVALIDDATA; | |
198 | } | |
199 | return AVERROR_EOF; | |
200 | } | |
201 | if (chunk_size > end || | |
202 | end - chunk_size < cur || | |
203 | chunk_size == UINT_MAX) { | |
204 | avio_seek(pb, -9, SEEK_CUR); | |
205 | chunk_code = avio_rl32(pb); | |
206 | chunk_size = avio_rl32(pb); | |
207 | if (chunk_size > end || end - chunk_size < cur || chunk_size == UINT_MAX) { | |
208 | av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n"); | |
209 | return AVERROR_INVALIDDATA; | |
210 | } | |
211 | } | |
212 | ||
213 | chunk_size += (chunk_size & 1); | |
214 | ||
215 | if (!chunk_code) { | |
216 | if (chunk_size) | |
217 | avio_skip(pb, chunk_size); | |
218 | else if (pb->eof_reached) { | |
219 | av_log(s, AV_LOG_WARNING, "truncated file\n"); | |
220 | return AVERROR_EOF; | |
221 | } | |
222 | continue; | |
223 | } | |
224 | ||
225 | value = av_mallocz(chunk_size + 1); | |
226 | if (!value) { | |
227 | av_log(s, AV_LOG_ERROR, | |
228 | "out of memory, unable to read INFO tag\n"); | |
229 | return AVERROR(ENOMEM); | |
230 | } | |
231 | ||
232 | AV_WL32(key, chunk_code); | |
233 | ||
234 | if (avio_read(pb, value, chunk_size) != chunk_size) { | |
235 | av_log(s, AV_LOG_WARNING, | |
236 | "premature end of file while reading INFO tag\n"); | |
237 | } | |
238 | ||
239 | av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL); | |
240 | } | |
241 | ||
242 | return 0; | |
243 | } |