FFmpeg coverage


Directory: ../../../ffmpeg/
File: src/libavformat/au.c
Date: 2024-03-29 11:55:30
Exec Total Coverage
Lines: 126 156 80.8%
Functions: 6 6 100.0%
Branches: 51 94 54.3%

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1 /*
2 * AU muxer and demuxer
3 * Copyright (c) 2001 Fabrice Bellard
4 *
5 * first version by Francois Revol <revol@free.fr>
6 *
7 * This file is part of FFmpeg.
8 *
9 * FFmpeg is free software; you can redistribute it and/or
10 * modify it under the terms of the GNU Lesser General Public
11 * License as published by the Free Software Foundation; either
12 * version 2.1 of the License, or (at your option) any later version.
13 *
14 * FFmpeg is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * Lesser General Public License for more details.
18 *
19 * You should have received a copy of the GNU Lesser General Public
20 * License along with FFmpeg; if not, write to the Free Software
21 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
22 */
23
24 /*
25 * Reference documents:
26 * http://www.opengroup.org/public/pubs/external/auformat.html
27 * http://www.goice.co.jp/member/mo/formats/au.html
28 */
29
30 #include "config_components.h"
31
32 #include "libavutil/bprint.h"
33 #include "libavutil/intreadwrite.h"
34 #include "avformat.h"
35 #include "demux.h"
36 #include "internal.h"
37 #include "avio_internal.h"
38 #include "mux.h"
39 #include "pcm.h"
40 #include "libavutil/avassert.h"
41
42 /* if we don't know the size in advance */
43 #define AU_UNKNOWN_SIZE ((uint32_t)(~0))
44
45 static const AVCodecTag codec_au_tags[] = {
46 { AV_CODEC_ID_PCM_MULAW, 1 },
47 { AV_CODEC_ID_PCM_S8, 2 },
48 { AV_CODEC_ID_PCM_S16BE, 3 },
49 { AV_CODEC_ID_PCM_S24BE, 4 },
50 { AV_CODEC_ID_PCM_S32BE, 5 },
51 { AV_CODEC_ID_PCM_F32BE, 6 },
52 { AV_CODEC_ID_PCM_F64BE, 7 },
53 { AV_CODEC_ID_ADPCM_G726LE, 23 },
54 { AV_CODEC_ID_ADPCM_G722,24 },
55 { AV_CODEC_ID_ADPCM_G726LE, 25 },
56 { AV_CODEC_ID_ADPCM_G726LE, 26 },
57 { AV_CODEC_ID_PCM_ALAW, 27 },
58 { AV_CODEC_ID_ADPCM_G726LE, MKBETAG('7','2','6','2') },
59 { AV_CODEC_ID_NONE, 0 },
60 };
61
62 static const AVCodecTag *const au_codec_tags[] = { codec_au_tags, NULL };
63
64 #if CONFIG_AU_DEMUXER
65
66 7124 static int au_probe(const AVProbeData *p)
67 {
68
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7124 if (p->buf_size < 24 ||
69
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7124 AV_RL32(p->buf) != MKTAG('.', 's', 'n', 'd') ||
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6 AV_RN32(p->buf+4) == 0 ||
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6 AV_RN32(p->buf+8) == 0 ||
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6 AV_RN32(p->buf+12) == 0 ||
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6 AV_RN32(p->buf+16) == 0 ||
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6 AV_RN32(p->buf+20) == 0)
75 7118 return 0;
76 6 return AVPROBE_SCORE_MAX;
77 }
78
79 6 static int au_read_annotation(AVFormatContext *s, int size)
80 {
81 static const char keys[][7] = {
82 "title",
83 "artist",
84 "album",
85 "track",
86 "genre",
87 };
88 6 AVIOContext *pb = s->pb;
89 6 enum { PARSE_KEY, PARSE_VALUE, PARSE_FINISHED } state = PARSE_KEY;
90 char c;
91 AVBPrint bprint;
92 6 char * key = NULL;
93 6 char * value = NULL;
94 int ret, i;
95
96 6 av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
97
98
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70 while (size-- > 0) {
99
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64 if (avio_feof(pb)) {
100 av_bprint_finalize(&bprint, NULL);
101 av_freep(&key);
102 return AVERROR_EOF;
103 }
104 64 c = avio_r8(pb);
105
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64 switch(state) {
106 16 case PARSE_KEY:
107
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16 if (c == '\0') {
108 4 state = PARSE_FINISHED;
109
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12 } else if (c == '=') {
110 2 ret = av_bprint_finalize(&bprint, &key);
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2 if (ret < 0)
112 return ret;
113 2 av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
114 2 state = PARSE_VALUE;
115 } else {
116 10 av_bprint_chars(&bprint, c, 1);
117 }
118 16 break;
119 18 case PARSE_VALUE:
120
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18 if (c == '\0' || c == '\n') {
121
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2 if (av_bprint_finalize(&bprint, &value) != 0) {
122 av_log(s, AV_LOG_ERROR, "Memory error while parsing AU metadata.\n");
123 } else {
124 2 av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
125
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2 for (i = 0; i < FF_ARRAY_ELEMS(keys); i++) {
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2 if (av_strcasecmp(keys[i], key) == 0) {
127 2 av_dict_set(&(s->metadata), keys[i], value, AV_DICT_DONT_STRDUP_VAL);
128 2 value = NULL;
129 2 break;
130 }
131 }
132 }
133 2 av_freep(&key);
134 2 av_freep(&value);
135
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2 state = (c == '\0') ? PARSE_FINISHED : PARSE_KEY;
136 } else {
137 16 av_bprint_chars(&bprint, c, 1);
138 }
139 18 break;
140 30 case PARSE_FINISHED:
141 30 break;
142 default:
143 /* should never happen */
144 av_assert0(0);
145 }
146 }
147 6 av_bprint_finalize(&bprint, NULL);
148 6 av_freep(&key);
149 6 return 0;
150 }
151
152 #define BLOCK_SIZE 1024
153
154 6 static int au_read_header(AVFormatContext *s)
155 {
156 6 int size, data_size = 0;
157 unsigned int tag;
158 6 AVIOContext *pb = s->pb;
159 unsigned int id, channels, rate;
160 6 int bps, ba = 0;
161 enum AVCodecID codec;
162 AVStream *st;
163 int ret;
164
165 6 tag = avio_rl32(pb);
166
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6 if (tag != MKTAG('.', 's', 'n', 'd'))
167 return AVERROR_INVALIDDATA;
168 6 size = avio_rb32(pb); /* header size */
169 6 data_size = avio_rb32(pb); /* data size in bytes */
170
171
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6 if (data_size < 0 && data_size != AU_UNKNOWN_SIZE) {
172 av_log(s, AV_LOG_ERROR, "Invalid negative data size '%d' found\n", data_size);
173 return AVERROR_INVALIDDATA;
174 }
175
176 6 id = avio_rb32(pb);
177 6 rate = avio_rb32(pb);
178 6 channels = avio_rb32(pb);
179
180
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6 if (size > 24) {
181 /* parse annotation field to get metadata */
182 6 ret = au_read_annotation(s, size - 24);
183
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6 if (ret < 0)
184 return ret;
185 }
186
187 6 codec = ff_codec_get_id(codec_au_tags, id);
188
189
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6 if (codec == AV_CODEC_ID_NONE) {
190 avpriv_request_sample(s, "unknown or unsupported codec tag: %u", id);
191 return AVERROR_PATCHWELCOME;
192 }
193
194 6 bps = av_get_bits_per_sample(codec);
195
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6 if (codec == AV_CODEC_ID_ADPCM_G726LE) {
196 if (id == MKBETAG('7','2','6','2')) {
197 bps = 2;
198 } else {
199 const uint8_t bpcss[] = {4, 0, 3, 5};
200 av_assert0(id >= 23 && id < 23 + 4);
201 ba = bpcss[id - 23];
202 bps = bpcss[id - 23];
203 }
204
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6 } else if (!bps) {
205 avpriv_request_sample(s, "Unknown bits per sample");
206 return AVERROR_PATCHWELCOME;
207 }
208
209
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6 if (channels == 0 || channels >= INT_MAX / (BLOCK_SIZE * bps >> 3)) {
210 av_log(s, AV_LOG_ERROR, "Invalid number of channels %u\n", channels);
211 return AVERROR_INVALIDDATA;
212 }
213
214
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6 if (rate == 0 || rate > INT_MAX) {
215 av_log(s, AV_LOG_ERROR, "Invalid sample rate: %u\n", rate);
216 return AVERROR_INVALIDDATA;
217 }
218
219 6 st = avformat_new_stream(s, NULL);
220
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6 if (!st)
221 return AVERROR(ENOMEM);
222 6 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
223 6 st->codecpar->codec_tag = id;
224 6 st->codecpar->codec_id = codec;
225 6 st->codecpar->ch_layout.nb_channels = channels;
226 6 st->codecpar->sample_rate = rate;
227 6 st->codecpar->bits_per_coded_sample = bps;
228 6 st->codecpar->bit_rate = channels * rate * bps;
229
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6 st->codecpar->block_align = ba ? ba : FFMAX(bps * channels / 8, 1);
230
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6 if (data_size != AU_UNKNOWN_SIZE)
231 6 st->duration = (((int64_t)data_size)<<3) / (channels * (int64_t)bps);
232
233 6 st->start_time = 0;
234 6 avpriv_set_pts_info(st, 64, 1, rate);
235
236 6 return 0;
237 }
238
239 const FFInputFormat ff_au_demuxer = {
240 .p.name = "au",
241 .p.long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
242 .p.codec_tag = au_codec_tags,
243 .read_probe = au_probe,
244 .read_header = au_read_header,
245 .read_packet = ff_pcm_read_packet,
246 .read_seek = ff_pcm_read_seek,
247 };
248
249 #endif /* CONFIG_AU_DEMUXER */
250
251 #if CONFIG_AU_MUXER
252
253 typedef struct AUContext {
254 uint32_t header_size;
255 } AUContext;
256
257 #include "rawenc.h"
258
259 3 static int au_get_annotations(AVFormatContext *s, AVBPrint *annotations)
260 {
261 static const char keys[][7] = {
262 "Title",
263 "Artist",
264 "Album",
265 "Track",
266 "Genre",
267 };
268 3 int cnt = 0;
269 3 AVDictionary *m = s->metadata;
270 3 AVDictionaryEntry *t = NULL;
271
272
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18 for (int i = 0; i < FF_ARRAY_ELEMS(keys); i++) {
273 15 t = av_dict_get(m, keys[i], NULL, 0);
274
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15 if (t != NULL) {
275
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1 if (cnt++)
276 av_bprint_chars(annotations, '\n', 1);
277 1 av_bprintf(annotations, "%s=%s", keys[i], t->value);
278 }
279 }
280 /* The specification requires the annotation field to be zero-terminated
281 * and its length to be a multiple of eight, so pad with 0's */
282 3 av_bprint_chars(annotations, '\0', 8);
283
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3 return av_bprint_is_complete(annotations) ? 0 : AVERROR(ENOMEM);
284 }
285
286 3 static int au_write_header(AVFormatContext *s)
287 {
288 int ret;
289 3 AUContext *au = s->priv_data;
290 3 AVIOContext *pb = s->pb;
291 3 AVCodecParameters *par = s->streams[0]->codecpar;
292 AVBPrint annotations;
293
294 3 par->codec_tag = ff_codec_get_tag(codec_au_tags, par->codec_id);
295
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3 if (!par->codec_tag) {
296 av_log(s, AV_LOG_ERROR, "unsupported codec\n");
297 return AVERROR(EINVAL);
298 }
299
300 3 av_bprint_init(&annotations, 0, INT_MAX - 24);
301 3 ret = au_get_annotations(s, &annotations);
302
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3 if (ret < 0)
303 goto fail;
304 3 au->header_size = 24 + annotations.len & ~7;
305
306 3 ffio_wfourcc(pb, ".snd"); /* magic number */
307 3 avio_wb32(pb, au->header_size); /* header size */
308 3 avio_wb32(pb, AU_UNKNOWN_SIZE); /* data size */
309 3 avio_wb32(pb, par->codec_tag); /* codec ID */
310 3 avio_wb32(pb, par->sample_rate);
311 3 avio_wb32(pb, par->ch_layout.nb_channels);
312 3 avio_write(pb, annotations.str, annotations.len & ~7);
313
314 3 fail:
315 3 av_bprint_finalize(&annotations, NULL);
316
317 3 return ret;
318 }
319
320 3 static int au_write_trailer(AVFormatContext *s)
321 {
322 3 AVIOContext *pb = s->pb;
323 3 AUContext *au = s->priv_data;
324 3 int64_t file_size = avio_tell(pb);
325
326
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3 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && file_size < INT32_MAX) {
327 /* update file size */
328 3 avio_seek(pb, 8, SEEK_SET);
329 3 avio_wb32(pb, (uint32_t)(file_size - au->header_size));
330 3 avio_seek(pb, file_size, SEEK_SET);
331 }
332
333 3 return 0;
334 }
335
336 const FFOutputFormat ff_au_muxer = {
337 .p.name = "au",
338 .p.long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
339 .p.mime_type = "audio/basic",
340 .p.extensions = "au",
341 .p.codec_tag = au_codec_tags,
342 .p.audio_codec = AV_CODEC_ID_PCM_S16BE,
343 .p.video_codec = AV_CODEC_ID_NONE,
344 .p.subtitle_codec = AV_CODEC_ID_NONE,
345 .p.flags = AVFMT_NOTIMESTAMPS,
346 .flags_internal = FF_OFMT_FLAG_MAX_ONE_OF_EACH,
347 .priv_data_size = sizeof(AUContext),
348 .write_header = au_write_header,
349 .write_packet = ff_raw_write_packet,
350 .write_trailer = au_write_trailer,
351 };
352
353 #endif /* CONFIG_AU_MUXER */
354