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 "avformat.h"
31 #include "internal.h"
32 #include "avio_internal.h"
33 #include "pcm.h"
34 #include "libavutil/avassert.h"
35
36 /* if we don't know the size in advance */
37 #define AU_UNKNOWN_SIZE ((uint32_t)(~0))
38
39 static const AVCodecTag codec_au_tags[] = {
40 { AV_CODEC_ID_PCM_MULAW, 1 },
41 { AV_CODEC_ID_PCM_S8, 2 },
42 { AV_CODEC_ID_PCM_S16BE, 3 },
43 { AV_CODEC_ID_PCM_S24BE, 4 },
44 { AV_CODEC_ID_PCM_S32BE, 5 },
45 { AV_CODEC_ID_PCM_F32BE, 6 },
46 { AV_CODEC_ID_PCM_F64BE, 7 },
47 { AV_CODEC_ID_ADPCM_G726LE, 23 },
48 { AV_CODEC_ID_ADPCM_G722,24 },
49 { AV_CODEC_ID_ADPCM_G726LE, 25 },
50 { AV_CODEC_ID_ADPCM_G726LE, 26 },
51 { AV_CODEC_ID_PCM_ALAW, 27 },
52 { AV_CODEC_ID_ADPCM_G726LE, MKBETAG('7','2','6','2') },
53 { AV_CODEC_ID_NONE, 0 },
54 };
55
56 static const AVCodecTag *const au_codec_tags[] = { codec_au_tags, NULL };
57
58 #if CONFIG_AU_DEMUXER
59
au_probe(const AVProbeData * p)60 static int au_probe(const AVProbeData *p)
61 {
62 if (p->buf[0] == '.' && p->buf[1] == 's' &&
63 p->buf[2] == 'n' && p->buf[3] == 'd')
64 return AVPROBE_SCORE_MAX;
65 else
66 return 0;
67 }
68
au_read_annotation(AVFormatContext * s,int size)69 static int au_read_annotation(AVFormatContext *s, int size)
70 {
71 static const char keys[][7] = {
72 "title",
73 "artist",
74 "album",
75 "track",
76 "genre",
77 };
78 AVIOContext *pb = s->pb;
79 enum { PARSE_KEY, PARSE_VALUE, PARSE_FINISHED } state = PARSE_KEY;
80 char c;
81 AVBPrint bprint;
82 char * key = NULL;
83 char * value = NULL;
84 int ret, i;
85
86 av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
87
88 while (size-- > 0) {
89 if (avio_feof(pb)) {
90 av_bprint_finalize(&bprint, NULL);
91 av_freep(&key);
92 return AVERROR_EOF;
93 }
94 c = avio_r8(pb);
95 switch(state) {
96 case PARSE_KEY:
97 if (c == '\0') {
98 state = PARSE_FINISHED;
99 } else if (c == '=') {
100 ret = av_bprint_finalize(&bprint, &key);
101 if (ret < 0)
102 return ret;
103 av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
104 state = PARSE_VALUE;
105 } else {
106 av_bprint_chars(&bprint, c, 1);
107 }
108 break;
109 case PARSE_VALUE:
110 if (c == '\0' || c == '\n') {
111 if (av_bprint_finalize(&bprint, &value) != 0) {
112 av_log(s, AV_LOG_ERROR, "Memory error while parsing AU metadata.\n");
113 } else {
114 av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
115 for (i = 0; i < FF_ARRAY_ELEMS(keys); i++) {
116 if (av_strcasecmp(keys[i], key) == 0) {
117 av_dict_set(&(s->metadata), keys[i], value, AV_DICT_DONT_STRDUP_VAL);
118 value = NULL;
119 break;
120 }
121 }
122 }
123 av_freep(&key);
124 av_freep(&value);
125 state = (c == '\0') ? PARSE_FINISHED : PARSE_KEY;
126 } else {
127 av_bprint_chars(&bprint, c, 1);
128 }
129 break;
130 case PARSE_FINISHED:
131 break;
132 default:
133 /* should never happen */
134 av_assert0(0);
135 }
136 }
137 av_bprint_finalize(&bprint, NULL);
138 av_freep(&key);
139 return 0;
140 }
141
142 #define BLOCK_SIZE 1024
143
au_read_header(AVFormatContext * s)144 static int au_read_header(AVFormatContext *s)
145 {
146 int size, data_size = 0;
147 unsigned int tag;
148 AVIOContext *pb = s->pb;
149 unsigned int id, channels, rate;
150 int bps, ba = 0;
151 enum AVCodecID codec;
152 AVStream *st;
153 int ret;
154
155 tag = avio_rl32(pb);
156 if (tag != MKTAG('.', 's', 'n', 'd'))
157 return AVERROR_INVALIDDATA;
158 size = avio_rb32(pb); /* header size */
159 data_size = avio_rb32(pb); /* data size in bytes */
160
161 if (data_size < 0 && data_size != AU_UNKNOWN_SIZE) {
162 av_log(s, AV_LOG_ERROR, "Invalid negative data size '%d' found\n", data_size);
163 return AVERROR_INVALIDDATA;
164 }
165
166 id = avio_rb32(pb);
167 rate = avio_rb32(pb);
168 channels = avio_rb32(pb);
169
170 if (size > 24) {
171 /* parse annotation field to get metadata */
172 ret = au_read_annotation(s, size - 24);
173 if (ret < 0)
174 return ret;
175 }
176
177 codec = ff_codec_get_id(codec_au_tags, id);
178
179 if (codec == AV_CODEC_ID_NONE) {
180 avpriv_request_sample(s, "unknown or unsupported codec tag: %u", id);
181 return AVERROR_PATCHWELCOME;
182 }
183
184 bps = av_get_bits_per_sample(codec);
185 if (codec == AV_CODEC_ID_ADPCM_G726LE) {
186 if (id == MKBETAG('7','2','6','2')) {
187 bps = 2;
188 } else {
189 const uint8_t bpcss[] = {4, 0, 3, 5};
190 av_assert0(id >= 23 && id < 23 + 4);
191 ba = bpcss[id - 23];
192 bps = bpcss[id - 23];
193 }
194 } else if (!bps) {
195 avpriv_request_sample(s, "Unknown bits per sample");
196 return AVERROR_PATCHWELCOME;
197 }
198
199 if (channels == 0 || channels >= INT_MAX / (BLOCK_SIZE * bps >> 3)) {
200 av_log(s, AV_LOG_ERROR, "Invalid number of channels %u\n", channels);
201 return AVERROR_INVALIDDATA;
202 }
203
204 if (rate == 0 || rate > INT_MAX) {
205 av_log(s, AV_LOG_ERROR, "Invalid sample rate: %u\n", rate);
206 return AVERROR_INVALIDDATA;
207 }
208
209 st = avformat_new_stream(s, NULL);
210 if (!st)
211 return AVERROR(ENOMEM);
212 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
213 st->codecpar->codec_tag = id;
214 st->codecpar->codec_id = codec;
215 st->codecpar->channels = channels;
216 st->codecpar->sample_rate = rate;
217 st->codecpar->bits_per_coded_sample = bps;
218 st->codecpar->bit_rate = channels * rate * bps;
219 st->codecpar->block_align = ba ? ba : FFMAX(bps * st->codecpar->channels / 8, 1);
220 if (data_size != AU_UNKNOWN_SIZE)
221 st->duration = (((int64_t)data_size)<<3) / (st->codecpar->channels * (int64_t)bps);
222
223 st->start_time = 0;
224 avpriv_set_pts_info(st, 64, 1, rate);
225
226 return 0;
227 }
228
229 AVInputFormat ff_au_demuxer = {
230 .name = "au",
231 .long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
232 .read_probe = au_probe,
233 .read_header = au_read_header,
234 .read_packet = ff_pcm_read_packet,
235 .read_seek = ff_pcm_read_seek,
236 .codec_tag = au_codec_tags,
237 };
238
239 #endif /* CONFIG_AU_DEMUXER */
240
241 #if CONFIG_AU_MUXER
242
243 typedef struct AUContext {
244 uint32_t header_size;
245 } AUContext;
246
247 #include "rawenc.h"
248
au_get_annotations(AVFormatContext * s,AVBPrint * annotations)249 static int au_get_annotations(AVFormatContext *s, AVBPrint *annotations)
250 {
251 static const char keys[][7] = {
252 "Title",
253 "Artist",
254 "Album",
255 "Track",
256 "Genre",
257 };
258 int cnt = 0;
259 AVDictionary *m = s->metadata;
260 AVDictionaryEntry *t = NULL;
261
262 for (int i = 0; i < FF_ARRAY_ELEMS(keys); i++) {
263 t = av_dict_get(m, keys[i], NULL, 0);
264 if (t != NULL) {
265 if (cnt++)
266 av_bprint_chars(annotations, '\n', 1);
267 av_bprintf(annotations, "%s=%s", keys[i], t->value);
268 }
269 }
270 /* The specification requires the annotation field to be zero-terminated
271 * and its length to be a multiple of eight, so pad with 0's */
272 av_bprint_chars(annotations, '\0', 8);
273 return av_bprint_is_complete(annotations) ? 0 : AVERROR(ENOMEM);
274 }
275
au_write_header(AVFormatContext * s)276 static int au_write_header(AVFormatContext *s)
277 {
278 int ret;
279 AUContext *au = s->priv_data;
280 AVIOContext *pb = s->pb;
281 AVCodecParameters *par = s->streams[0]->codecpar;
282 AVBPrint annotations;
283
284 if (s->nb_streams != 1) {
285 av_log(s, AV_LOG_ERROR, "only one stream is supported\n");
286 return AVERROR(EINVAL);
287 }
288
289 par->codec_tag = ff_codec_get_tag(codec_au_tags, par->codec_id);
290 if (!par->codec_tag) {
291 av_log(s, AV_LOG_ERROR, "unsupported codec\n");
292 return AVERROR(EINVAL);
293 }
294
295 av_bprint_init(&annotations, 0, INT_MAX - 24);
296 ret = au_get_annotations(s, &annotations);
297 if (ret < 0)
298 goto fail;
299 au->header_size = 24 + annotations.len & ~7;
300
301 ffio_wfourcc(pb, ".snd"); /* magic number */
302 avio_wb32(pb, au->header_size); /* header size */
303 avio_wb32(pb, AU_UNKNOWN_SIZE); /* data size */
304 avio_wb32(pb, par->codec_tag); /* codec ID */
305 avio_wb32(pb, par->sample_rate);
306 avio_wb32(pb, par->channels);
307 avio_write(pb, annotations.str, annotations.len & ~7);
308
309 fail:
310 av_bprint_finalize(&annotations, NULL);
311
312 return ret;
313 }
314
au_write_trailer(AVFormatContext * s)315 static int au_write_trailer(AVFormatContext *s)
316 {
317 AVIOContext *pb = s->pb;
318 AUContext *au = s->priv_data;
319 int64_t file_size = avio_tell(pb);
320
321 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && file_size < INT32_MAX) {
322 /* update file size */
323 avio_seek(pb, 8, SEEK_SET);
324 avio_wb32(pb, (uint32_t)(file_size - au->header_size));
325 avio_seek(pb, file_size, SEEK_SET);
326 }
327
328 return 0;
329 }
330
331 AVOutputFormat ff_au_muxer = {
332 .name = "au",
333 .long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
334 .mime_type = "audio/basic",
335 .extensions = "au",
336 .priv_data_size = sizeof(AUContext),
337 .audio_codec = AV_CODEC_ID_PCM_S16BE,
338 .video_codec = AV_CODEC_ID_NONE,
339 .write_header = au_write_header,
340 .write_packet = ff_raw_write_packet,
341 .write_trailer = au_write_trailer,
342 .codec_tag = au_codec_tags,
343 .flags = AVFMT_NOTIMESTAMPS,
344 };
345
346 #endif /* CONFIG_AU_MUXER */
347