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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/avassert.h"
23 #include "libavutil/dict.h"
24 #include "libavutil/error.h"
25 #include "libavutil/intreadwrite.h"
26 #include "libavutil/log.h"
27 #include "avformat.h"
28 #include "avio_internal.h"
29 #include "demux.h"
30 #include "riff.h"
31 
ff_get_guid(AVIOContext * s,ff_asf_guid * g)32 int ff_get_guid(AVIOContext *s, ff_asf_guid *g)
33 {
34     int ret;
35     av_assert0(sizeof(*g) == 16); //compiler will optimize this out
36     ret = ffio_read_size(s, *g, sizeof(*g));
37     if (ret < 0) {
38         memset(*g, 0, sizeof(*g));
39         return ret;
40     }
41     return 0;
42 }
43 
ff_codec_guid_get_id(const AVCodecGuid * guids,ff_asf_guid guid)44 enum AVCodecID ff_codec_guid_get_id(const AVCodecGuid *guids, ff_asf_guid guid)
45 {
46     int i;
47     for (i = 0; guids[i].id != AV_CODEC_ID_NONE; i++)
48         if (!ff_guidcmp(guids[i].guid, guid))
49             return guids[i].id;
50     return AV_CODEC_ID_NONE;
51 }
52 
53 /* We could be given one of the three possible structures here:
54  * WAVEFORMAT, PCMWAVEFORMAT or WAVEFORMATEX. Each structure
55  * is an expansion of the previous one with the fields added
56  * at the bottom. PCMWAVEFORMAT adds 'WORD wBitsPerSample' and
57  * WAVEFORMATEX adds 'WORD  cbSize' and basically makes itself
58  * an openended structure.
59  */
60 
parse_waveformatex(AVFormatContext * s,AVIOContext * pb,AVCodecParameters * par)61 static void parse_waveformatex(AVFormatContext *s, AVIOContext *pb, AVCodecParameters *par)
62 {
63     ff_asf_guid subformat;
64     int bps;
65     uint64_t mask;
66 
67     bps = avio_rl16(pb);
68     if (bps)
69         par->bits_per_coded_sample = bps;
70 
71     mask = avio_rl32(pb); /* dwChannelMask */
72     av_channel_layout_from_mask(&par->ch_layout, mask);
73 
74     ff_get_guid(pb, &subformat);
75     if (!memcmp(subformat + 4,
76                 (const uint8_t[]){ FF_AMBISONIC_BASE_GUID }, 12) ||
77         !memcmp(subformat + 4,
78                 (const uint8_t[]){ FF_BROKEN_BASE_GUID }, 12) ||
79         !memcmp(subformat + 4,
80                 (const uint8_t[]){ FF_MEDIASUBTYPE_BASE_GUID }, 12)) {
81         par->codec_tag = AV_RL32(subformat);
82         par->codec_id  = ff_wav_codec_get_id(par->codec_tag,
83                                              par->bits_per_coded_sample);
84     } else {
85         par->codec_id = ff_codec_guid_get_id(ff_codec_wav_guids, subformat);
86         if (!par->codec_id)
87             av_log(s, AV_LOG_WARNING,
88                    "unknown subformat:"FF_PRI_GUID"\n",
89                    FF_ARG_GUID(subformat));
90     }
91 }
92 
93 /* "big_endian" values are needed for RIFX file format */
ff_get_wav_header(AVFormatContext * s,AVIOContext * pb,AVCodecParameters * par,int size,int big_endian)94 int ff_get_wav_header(AVFormatContext *s, AVIOContext *pb,
95                       AVCodecParameters *par, int size, int big_endian)
96 {
97     int id, channels = 0;
98     uint64_t bitrate = 0;
99 
100     if (size < 14) {
101         avpriv_request_sample(s, "wav header size < 14");
102         return AVERROR_INVALIDDATA;
103     }
104 
105     av_channel_layout_uninit(&par->ch_layout);
106 
107     par->codec_type  = AVMEDIA_TYPE_AUDIO;
108     if (!big_endian) {
109         id                 = avio_rl16(pb);
110         if (id != 0x0165) {
111             channels         = avio_rl16(pb);
112             par->sample_rate = avio_rl32(pb);
113             bitrate            = avio_rl32(pb) * 8LL;
114             par->block_align = avio_rl16(pb);
115         }
116     } else {
117         id                 = avio_rb16(pb);
118         channels           = avio_rb16(pb);
119         par->sample_rate = avio_rb32(pb);
120         bitrate            = avio_rb32(pb) * 8LL;
121         par->block_align = avio_rb16(pb);
122     }
123     if (size == 14) {  /* We're dealing with plain vanilla WAVEFORMAT */
124         par->bits_per_coded_sample = 8;
125     } else {
126         if (!big_endian) {
127             par->bits_per_coded_sample = avio_rl16(pb);
128         } else {
129             par->bits_per_coded_sample = avio_rb16(pb);
130         }
131     }
132     if (id == 0xFFFE) {
133         par->codec_tag = 0;
134     } else {
135         par->codec_tag = id;
136         par->codec_id  = ff_wav_codec_get_id(id,
137                                              par->bits_per_coded_sample);
138     }
139     if (size >= 18 && id != 0x0165) {  /* We're obviously dealing with WAVEFORMATEX */
140         int cbSize = avio_rl16(pb); /* cbSize */
141         if (big_endian) {
142             avpriv_report_missing_feature(s, "WAVEFORMATEX support for RIFX files");
143             return AVERROR_PATCHWELCOME;
144         }
145         size  -= 18;
146         cbSize = FFMIN(size, cbSize);
147         if (cbSize >= 22 && id == 0xfffe) { /* WAVEFORMATEXTENSIBLE */
148             parse_waveformatex(s, pb, par);
149             cbSize -= 22;
150             size   -= 22;
151         }
152         if (cbSize > 0) {
153             if (ff_get_extradata(s, par, pb, cbSize) < 0)
154                 return AVERROR(ENOMEM);
155             size -= cbSize;
156         }
157 
158         /* It is possible for the chunk to contain garbage at the end */
159         if (size > 0)
160             avio_skip(pb, size);
161     } else if (id == 0x0165 && size >= 32) {
162         int nb_streams, i;
163 
164         size -= 4;
165         if (ff_get_extradata(s, par, pb, size) < 0)
166             return AVERROR(ENOMEM);
167         nb_streams         = AV_RL16(par->extradata + 4);
168         par->sample_rate   = AV_RL32(par->extradata + 12);
169         channels           = 0;
170         bitrate            = 0;
171         if (size < 8 + nb_streams * 20)
172             return AVERROR_INVALIDDATA;
173         for (i = 0; i < nb_streams; i++)
174             channels += par->extradata[8 + i * 20 + 17];
175     }
176 
177     par->bit_rate = bitrate;
178 
179     if (par->sample_rate <= 0) {
180         av_log(s, AV_LOG_ERROR,
181                "Invalid sample rate: %d\n", par->sample_rate);
182         return AVERROR_INVALIDDATA;
183     }
184     if (par->codec_id == AV_CODEC_ID_AAC_LATM) {
185         /* Channels and sample_rate values are those prior to applying SBR
186          * and/or PS. */
187         channels         = 0;
188         par->sample_rate = 0;
189     }
190     /* override bits_per_coded_sample for G.726 */
191     if (par->codec_id == AV_CODEC_ID_ADPCM_G726 && par->sample_rate)
192         par->bits_per_coded_sample = par->bit_rate / par->sample_rate;
193 
194     /* ignore WAVEFORMATEXTENSIBLE layout if different from channel count */
195     if (channels != par->ch_layout.nb_channels) {
196         av_channel_layout_uninit(&par->ch_layout);
197         par->ch_layout.order       = AV_CHANNEL_ORDER_UNSPEC;
198         par->ch_layout.nb_channels = channels;
199     }
200 
201     return 0;
202 }
203 
ff_wav_codec_get_id(unsigned int tag,int bps)204 enum AVCodecID ff_wav_codec_get_id(unsigned int tag, int bps)
205 {
206     enum AVCodecID id;
207     id = ff_codec_get_id(ff_codec_wav_tags, tag);
208     if (id <= 0)
209         return id;
210 
211     if (id == AV_CODEC_ID_PCM_S16LE)
212         id = ff_get_pcm_codec_id(bps, 0, 0, ~1);
213     else if (id == AV_CODEC_ID_PCM_F32LE)
214         id = ff_get_pcm_codec_id(bps, 1, 0,  0);
215 
216     if (id == AV_CODEC_ID_ADPCM_IMA_WAV && bps == 8)
217         id = AV_CODEC_ID_ADPCM_ZORK;
218     return id;
219 }
220 
ff_get_bmp_header(AVIOContext * pb,AVStream * st,uint32_t * size)221 int ff_get_bmp_header(AVIOContext *pb, AVStream *st, uint32_t *size)
222 {
223     int tag1;
224     uint32_t size_ = avio_rl32(pb);
225     if (size)
226         *size = size_;
227     st->codecpar->width  = avio_rl32(pb);
228     st->codecpar->height = (int32_t)avio_rl32(pb);
229     avio_rl16(pb); /* planes */
230     st->codecpar->bits_per_coded_sample = avio_rl16(pb); /* depth */
231     tag1                                = avio_rl32(pb);
232     avio_rl32(pb); /* ImageSize */
233     avio_rl32(pb); /* XPelsPerMeter */
234     avio_rl32(pb); /* YPelsPerMeter */
235     avio_rl32(pb); /* ClrUsed */
236     avio_rl32(pb); /* ClrImportant */
237     return tag1;
238 }
239 
ff_read_riff_info(AVFormatContext * s,int64_t size)240 int ff_read_riff_info(AVFormatContext *s, int64_t size)
241 {
242     int64_t start, end, cur;
243     AVIOContext *pb = s->pb;
244 
245     start = avio_tell(pb);
246     end   = start + size;
247 
248     while ((cur = avio_tell(pb)) >= 0 &&
249            cur <= end - 8 /* = tag + size */) {
250         uint32_t chunk_code;
251         int64_t chunk_size;
252         char key[5] = { 0 };
253         char *value;
254 
255         chunk_code = avio_rl32(pb);
256         chunk_size = avio_rl32(pb);
257         if (avio_feof(pb)) {
258             if (chunk_code || chunk_size) {
259                 av_log(s, AV_LOG_WARNING, "INFO subchunk truncated\n");
260                 return AVERROR_INVALIDDATA;
261             }
262             return AVERROR_EOF;
263         }
264         if (chunk_size > end ||
265             end - chunk_size < cur ||
266             chunk_size == UINT_MAX) {
267             avio_seek(pb, -9, SEEK_CUR);
268             chunk_code = avio_rl32(pb);
269             chunk_size = avio_rl32(pb);
270             if (chunk_size > end || end - chunk_size < cur || chunk_size == UINT_MAX) {
271                 av_log(s, AV_LOG_WARNING, "too big INFO subchunk\n");
272                 return AVERROR_INVALIDDATA;
273             }
274         }
275 
276         chunk_size += (chunk_size & 1);
277 
278         if (!chunk_code) {
279             if (chunk_size)
280                 avio_skip(pb, chunk_size);
281             else if (pb->eof_reached) {
282                 av_log(s, AV_LOG_WARNING, "truncated file\n");
283                 return AVERROR_EOF;
284             }
285             continue;
286         }
287 
288         value = av_mallocz(chunk_size + 1);
289         if (!value) {
290             av_log(s, AV_LOG_ERROR,
291                    "out of memory, unable to read INFO tag\n");
292             return AVERROR(ENOMEM);
293         }
294 
295         AV_WL32(key, chunk_code);
296         // Work around VC++ 2015 Update 1 code-gen bug:
297         // https://connect.microsoft.com/VisualStudio/feedback/details/2291638
298         key[4] = 0;
299 
300         if (avio_read(pb, value, chunk_size) != chunk_size) {
301             av_log(s, AV_LOG_WARNING,
302                    "premature end of file while reading INFO tag\n");
303         }
304 
305         av_dict_set(&s->metadata, key, value, AV_DICT_DONT_STRDUP_VAL);
306     }
307 
308     return 0;
309 }
310