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
)
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
;
42 enum AVCodecID
ff_codec_guid_get_id(const AVCodecGuid
*guids
, ff_asf_guid guid
)
45 for (i
= 0; guids
[i
].id
!= AV_CODEC_ID_NONE
; i
++)
46 if (!ff_guidcmp(guids
[i
].guid
, guid
))
48 return AV_CODEC_ID_NONE
;
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.
59 static void parse_waveformatex(AVIOContext
*pb
, AVCodecContext
*c
)
61 ff_asf_guid subformat
;
62 int bps
= avio_rl16(pb
);
64 c
->bits_per_coded_sample
= bps
;
66 c
->channel_layout
= avio_rl32(pb
); /* dwChannelMask */
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
);
75 c
->codec_id
= ff_codec_guid_get_id(ff_codec_wav_guids
, subformat
);
77 av_log(c
, AV_LOG_WARNING
,
78 "unknown subformat:"FF_PRI_GUID
"\n",
79 FF_ARG_GUID(subformat
));
83 int ff_get_wav_header(AVIOContext
*pb
, AVCodecContext
*codec
, int size
)
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;
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
);
114 av_free(codec
->extradata
);
115 if (ff_get_extradata(codec
, pb
, cbSize
) < 0)
116 return AVERROR(ENOMEM
);
120 /* It is possible for the chunk to contain garbage at the end */
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
;
129 if (codec
->codec_id
== AV_CODEC_ID_AAC_LATM
) {
130 /* Channels and sample_rate values are those prior to applying SBR
133 codec
->sample_rate
= 0;
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
;
142 enum AVCodecID
ff_wav_codec_get_id(unsigned int tag
, int bps
)
145 id
= ff_codec_get_id(ff_codec_wav_tags
, tag
);
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);
154 if (id
== AV_CODEC_ID_ADPCM_IMA_WAV
&& bps
== 8)
155 id
= AV_CODEC_ID_PCM_ZORK
;
159 int ff_get_bmp_header(AVIOContext
*pb
, AVStream
*st
, unsigned *esize
)
162 if(esize
) *esize
= 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 */
177 int ff_read_riff_info(AVFormatContext
*s
, int64_t size
)
179 int64_t start
, end
, cur
;
180 AVIOContext
*pb
= s
->pb
;
182 start
= avio_tell(pb
);
185 while ((cur
= avio_tell(pb
)) >= 0 &&
186 cur
<= end
- 8 /* = tag + size */) {
192 chunk_code
= avio_rl32(pb
);
193 chunk_size
= avio_rl32(pb
);
195 if (chunk_code
|| chunk_size
) {
196 av_log(s
, AV_LOG_WARNING
, "INFO subchunk truncated\n");
197 return AVERROR_INVALIDDATA
;
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
;
213 chunk_size
+= (chunk_size
& 1);
217 avio_skip(pb
, chunk_size
);
218 else if (pb
->eof_reached
) {
219 av_log(s
, AV_LOG_WARNING
, "truncated file\n");
225 value
= av_mallocz(chunk_size
+ 1);
227 av_log(s
, AV_LOG_ERROR
,
228 "out of memory, unable to read INFO tag\n");
229 return AVERROR(ENOMEM
);
232 AV_WL32(key
, chunk_code
);
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");
239 av_dict_set(&s
->metadata
, key
, value
, AV_DICT_DONT_STRDUP_VAL
);