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 /* the specification requires an annotation field of at least eight bytes */
39 #define AU_DEFAULT_HEADER_SIZE (24+8)
40
41 static const AVCodecTag codec_au_tags[] = {
42 { AV_CODEC_ID_PCM_MULAW, 1 },
43 { AV_CODEC_ID_PCM_S8, 2 },
44 { AV_CODEC_ID_PCM_S16BE, 3 },
45 { AV_CODEC_ID_PCM_S24BE, 4 },
46 { AV_CODEC_ID_PCM_S32BE, 5 },
47 { AV_CODEC_ID_PCM_F32BE, 6 },
48 { AV_CODEC_ID_PCM_F64BE, 7 },
49 { AV_CODEC_ID_ADPCM_G726LE, 23 },
50 { AV_CODEC_ID_ADPCM_G722,24 },
51 { AV_CODEC_ID_ADPCM_G726LE, 25 },
52 { AV_CODEC_ID_ADPCM_G726LE, 26 },
53 { AV_CODEC_ID_PCM_ALAW, 27 },
54 { AV_CODEC_ID_ADPCM_G726LE, MKBETAG('7','2','6','2') },
55 { AV_CODEC_ID_NONE, 0 },
56 };
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[] = {
72 "title",
73 "artist",
74 "album",
75 "track",
76 "genre",
77 NULL };
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 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 av_bprint_finalize(&bprint, &key);
101 av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
102 state = PARSE_VALUE;
103 } else {
104 av_bprint_chars(&bprint, c, 1);
105 }
106 break;
107 case PARSE_VALUE:
108 if (c == '\0' || c == '\n') {
109 if (av_bprint_finalize(&bprint, &value) != 0) {
110 av_log(s, AV_LOG_ERROR, "Memory error while parsing AU metadata.\n");
111 } else {
112 av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
113 for (i = 0; keys[i] != NULL && key != NULL; i++) {
114 if (av_strcasecmp(keys[i], key) == 0) {
115 av_dict_set(&(s->metadata), keys[i], value, AV_DICT_DONT_STRDUP_VAL);
116 av_freep(&key);
117 value = NULL;
118 }
119 }
120 }
121 av_freep(&key);
122 av_freep(&value);
123 state = (c == '\0') ? PARSE_FINISHED : PARSE_KEY;
124 } else {
125 av_bprint_chars(&bprint, c, 1);
126 }
127 break;
128 case PARSE_FINISHED:
129 break;
130 default:
131 /* should never happen */
132 av_assert0(0);
133 }
134 }
135 av_bprint_finalize(&bprint, NULL);
136 av_freep(&key);
137 return 0;
138 }
139
140 #define BLOCK_SIZE 1024
141
au_read_header(AVFormatContext * s)142 static int au_read_header(AVFormatContext *s)
143 {
144 int size, data_size = 0;
145 unsigned int tag;
146 AVIOContext *pb = s->pb;
147 unsigned int id, channels, rate;
148 int bps, ba = 0;
149 enum AVCodecID codec;
150 AVStream *st;
151
152 tag = avio_rl32(pb);
153 if (tag != MKTAG('.', 's', 'n', 'd'))
154 return AVERROR_INVALIDDATA;
155 size = avio_rb32(pb); /* header size */
156 data_size = avio_rb32(pb); /* data size in bytes */
157
158 if (data_size < 0 && data_size != AU_UNKNOWN_SIZE) {
159 av_log(s, AV_LOG_ERROR, "Invalid negative data size '%d' found\n", data_size);
160 return AVERROR_INVALIDDATA;
161 }
162
163 id = avio_rb32(pb);
164 rate = avio_rb32(pb);
165 channels = avio_rb32(pb);
166
167 if (size > 24) {
168 /* parse annotation field to get metadata */
169 au_read_annotation(s, size - 24);
170 }
171
172 codec = ff_codec_get_id(codec_au_tags, id);
173
174 if (codec == AV_CODEC_ID_NONE) {
175 avpriv_request_sample(s, "unknown or unsupported codec tag: %u", id);
176 return AVERROR_PATCHWELCOME;
177 }
178
179 bps = av_get_bits_per_sample(codec);
180 if (codec == AV_CODEC_ID_ADPCM_G726LE) {
181 if (id == MKBETAG('7','2','6','2')) {
182 bps = 2;
183 } else {
184 const uint8_t bpcss[] = {4, 0, 3, 5};
185 av_assert0(id >= 23 && id < 23 + 4);
186 ba = bpcss[id - 23];
187 bps = bpcss[id - 23];
188 }
189 } else if (!bps) {
190 avpriv_request_sample(s, "Unknown bits per sample");
191 return AVERROR_PATCHWELCOME;
192 }
193
194 if (channels == 0 || channels >= INT_MAX / (BLOCK_SIZE * bps >> 3)) {
195 av_log(s, AV_LOG_ERROR, "Invalid number of channels %u\n", channels);
196 return AVERROR_INVALIDDATA;
197 }
198
199 if (rate == 0 || rate > INT_MAX) {
200 av_log(s, AV_LOG_ERROR, "Invalid sample rate: %u\n", rate);
201 return AVERROR_INVALIDDATA;
202 }
203
204 st = avformat_new_stream(s, NULL);
205 if (!st)
206 return AVERROR(ENOMEM);
207 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
208 st->codecpar->codec_tag = id;
209 st->codecpar->codec_id = codec;
210 st->codecpar->channels = channels;
211 st->codecpar->sample_rate = rate;
212 st->codecpar->bits_per_coded_sample = bps;
213 st->codecpar->bit_rate = channels * rate * bps;
214 st->codecpar->block_align = ba ? ba : FFMAX(bps * st->codecpar->channels / 8, 1);
215 if (data_size != AU_UNKNOWN_SIZE)
216 st->duration = (((int64_t)data_size)<<3) / (st->codecpar->channels * (int64_t)bps);
217
218 st->start_time = 0;
219 avpriv_set_pts_info(st, 64, 1, rate);
220
221 return 0;
222 }
223
224 AVInputFormat ff_au_demuxer = {
225 .name = "au",
226 .long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
227 .read_probe = au_probe,
228 .read_header = au_read_header,
229 .read_packet = ff_pcm_read_packet,
230 .read_seek = ff_pcm_read_seek,
231 .codec_tag = (const AVCodecTag* const []) { codec_au_tags, 0 },
232 };
233
234 #endif /* CONFIG_AU_DEMUXER */
235
236 #if CONFIG_AU_MUXER
237
238 typedef struct AUContext {
239 uint32_t header_size;
240 } AUContext;
241
242 #include "rawenc.h"
243
au_get_annotations(AVFormatContext * s,char ** buffer)244 static int au_get_annotations(AVFormatContext *s, char **buffer)
245 {
246 static const char * keys[] = {
247 "Title",
248 "Artist",
249 "Album",
250 "Track",
251 "Genre",
252 NULL };
253 int i;
254 int cnt = 0;
255 AVDictionary *m = s->metadata;
256 AVDictionaryEntry *t = NULL;
257 AVBPrint bprint;
258
259 av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
260
261 for (i = 0; keys[i] != NULL; i++) {
262 t = av_dict_get(m, keys[i], NULL, 0);
263 if (t != NULL) {
264 if (cnt++)
265 av_bprint_chars(&bprint, '\n', 1);
266 av_bprint_append_data(&bprint, keys[i], strlen(keys[i]));
267 av_bprint_chars(&bprint, '=', 1);
268 av_bprint_append_data(&bprint, t->value, strlen(t->value));
269 }
270 }
271 /* pad with 0's */
272 av_bprint_append_data(&bprint, "\0\0\0\0\0\0\0\0", 8);
273 return av_bprint_finalize(&bprint, buffer);
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 char *annotations = NULL;
283
284 au->header_size = AU_DEFAULT_HEADER_SIZE;
285
286 if (s->nb_streams != 1) {
287 av_log(s, AV_LOG_ERROR, "only one stream is supported\n");
288 return AVERROR(EINVAL);
289 }
290
291 par->codec_tag = ff_codec_get_tag(codec_au_tags, par->codec_id);
292 if (!par->codec_tag) {
293 av_log(s, AV_LOG_ERROR, "unsupported codec\n");
294 return AVERROR(EINVAL);
295 }
296
297 if (av_dict_count(s->metadata) > 0) {
298 ret = au_get_annotations(s, &annotations);
299 if (ret < 0)
300 return ret;
301 if (annotations != NULL) {
302 au->header_size = (24 + strlen(annotations) + 8) & ~7;
303 if (au->header_size < AU_DEFAULT_HEADER_SIZE)
304 au->header_size = AU_DEFAULT_HEADER_SIZE;
305 }
306 }
307 ffio_wfourcc(pb, ".snd"); /* magic number */
308 avio_wb32(pb, au->header_size); /* header size */
309 avio_wb32(pb, AU_UNKNOWN_SIZE); /* data size */
310 avio_wb32(pb, par->codec_tag); /* codec ID */
311 avio_wb32(pb, par->sample_rate);
312 avio_wb32(pb, par->channels);
313 if (annotations != NULL) {
314 avio_write(pb, annotations, au->header_size - 24);
315 av_freep(&annotations);
316 } else {
317 avio_wb64(pb, 0); /* annotation field */
318 }
319
320 return 0;
321 }
322
au_write_trailer(AVFormatContext * s)323 static int au_write_trailer(AVFormatContext *s)
324 {
325 AVIOContext *pb = s->pb;
326 AUContext *au = s->priv_data;
327 int64_t file_size = avio_tell(pb);
328
329 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && file_size < INT32_MAX) {
330 /* update file size */
331 avio_seek(pb, 8, SEEK_SET);
332 avio_wb32(pb, (uint32_t)(file_size - au->header_size));
333 avio_seek(pb, file_size, SEEK_SET);
334 }
335
336 return 0;
337 }
338
339 AVOutputFormat ff_au_muxer = {
340 .name = "au",
341 .long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
342 .mime_type = "audio/basic",
343 .extensions = "au",
344 .priv_data_size = sizeof(AUContext),
345 .audio_codec = AV_CODEC_ID_PCM_S16BE,
346 .video_codec = AV_CODEC_ID_NONE,
347 .write_header = au_write_header,
348 .write_packet = ff_raw_write_packet,
349 .write_trailer = au_write_trailer,
350 .codec_tag = (const AVCodecTag* const []) { codec_au_tags, 0 },
351 .flags = AVFMT_NOTIMESTAMPS,
352 };
353
354 #endif /* CONFIG_AU_MUXER */
355