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 "avformat.h"
34 #include "internal.h"
35 #include "avio_internal.h"
36 #include "pcm.h"
37 #include "libavutil/avassert.h"
38
39 /* if we don't know the size in advance */
40 #define AU_UNKNOWN_SIZE ((uint32_t)(~0))
41
42 static const AVCodecTag codec_au_tags[] = {
43 { AV_CODEC_ID_PCM_MULAW, 1 },
44 { AV_CODEC_ID_PCM_S8, 2 },
45 { AV_CODEC_ID_PCM_S16BE, 3 },
46 { AV_CODEC_ID_PCM_S24BE, 4 },
47 { AV_CODEC_ID_PCM_S32BE, 5 },
48 { AV_CODEC_ID_PCM_F32BE, 6 },
49 { AV_CODEC_ID_PCM_F64BE, 7 },
50 { AV_CODEC_ID_ADPCM_G726LE, 23 },
51 { AV_CODEC_ID_ADPCM_G722,24 },
52 { AV_CODEC_ID_ADPCM_G726LE, 25 },
53 { AV_CODEC_ID_ADPCM_G726LE, 26 },
54 { AV_CODEC_ID_PCM_ALAW, 27 },
55 { AV_CODEC_ID_ADPCM_G726LE, MKBETAG('7','2','6','2') },
56 { AV_CODEC_ID_NONE, 0 },
57 };
58
59 static const AVCodecTag *const au_codec_tags[] = { codec_au_tags, NULL };
60
61 #if CONFIG_AU_DEMUXER
62
au_probe(const AVProbeData *p)63 static int au_probe(const AVProbeData *p)
64 {
65 if (p->buf[0] == '.' && p->buf[1] == 's' &&
66 p->buf[2] == 'n' && p->buf[3] == 'd')
67 return AVPROBE_SCORE_MAX;
68 else
69 return 0;
70 }
71
au_read_annotation(AVFormatContext *s, int size)72 static int au_read_annotation(AVFormatContext *s, int size)
73 {
74 static const char keys[][7] = {
75 "title",
76 "artist",
77 "album",
78 "track",
79 "genre",
80 };
81 AVIOContext *pb = s->pb;
82 enum { PARSE_KEY, PARSE_VALUE, PARSE_FINISHED } state = PARSE_KEY;
83 char c;
84 AVBPrint bprint;
85 char * key = NULL;
86 char * value = NULL;
87 int ret, i;
88
89 av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
90
91 while (size-- > 0) {
92 if (avio_feof(pb)) {
93 av_bprint_finalize(&bprint, NULL);
94 av_freep(&key);
95 return AVERROR_EOF;
96 }
97 c = avio_r8(pb);
98 switch(state) {
99 case PARSE_KEY:
100 if (c == '\0') {
101 state = PARSE_FINISHED;
102 } else if (c == '=') {
103 ret = av_bprint_finalize(&bprint, &key);
104 if (ret < 0)
105 return ret;
106 av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
107 state = PARSE_VALUE;
108 } else {
109 av_bprint_chars(&bprint, c, 1);
110 }
111 break;
112 case PARSE_VALUE:
113 if (c == '\0' || c == '\n') {
114 if (av_bprint_finalize(&bprint, &value) != 0) {
115 av_log(s, AV_LOG_ERROR, "Memory error while parsing AU metadata.\n");
116 } else {
117 av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
118 for (i = 0; i < FF_ARRAY_ELEMS(keys); i++) {
119 if (av_strcasecmp(keys[i], key) == 0) {
120 av_dict_set(&(s->metadata), keys[i], value, AV_DICT_DONT_STRDUP_VAL);
121 value = NULL;
122 break;
123 }
124 }
125 }
126 av_freep(&key);
127 av_freep(&value);
128 state = (c == '\0') ? PARSE_FINISHED : PARSE_KEY;
129 } else {
130 av_bprint_chars(&bprint, c, 1);
131 }
132 break;
133 case PARSE_FINISHED:
134 break;
135 default:
136 /* should never happen */
137 av_assert0(0);
138 }
139 }
140 av_bprint_finalize(&bprint, NULL);
141 av_freep(&key);
142 return 0;
143 }
144
145 #define BLOCK_SIZE 1024
146
au_read_header(AVFormatContext *s)147 static int au_read_header(AVFormatContext *s)
148 {
149 int size, data_size = 0;
150 unsigned int tag;
151 AVIOContext *pb = s->pb;
152 unsigned int id, channels, rate;
153 int bps, ba = 0;
154 enum AVCodecID codec;
155 AVStream *st;
156 int ret;
157
158 tag = avio_rl32(pb);
159 if (tag != MKTAG('.', 's', 'n', 'd'))
160 return AVERROR_INVALIDDATA;
161 size = avio_rb32(pb); /* header size */
162 data_size = avio_rb32(pb); /* data size in bytes */
163
164 if (data_size < 0 && data_size != AU_UNKNOWN_SIZE) {
165 av_log(s, AV_LOG_ERROR, "Invalid negative data size '%d' found\n", data_size);
166 return AVERROR_INVALIDDATA;
167 }
168
169 id = avio_rb32(pb);
170 rate = avio_rb32(pb);
171 channels = avio_rb32(pb);
172
173 if (size > 24) {
174 /* parse annotation field to get metadata */
175 ret = au_read_annotation(s, size - 24);
176 if (ret < 0)
177 return ret;
178 }
179
180 codec = ff_codec_get_id(codec_au_tags, id);
181
182 if (codec == AV_CODEC_ID_NONE) {
183 avpriv_request_sample(s, "unknown or unsupported codec tag: %u", id);
184 return AVERROR_PATCHWELCOME;
185 }
186
187 bps = av_get_bits_per_sample(codec);
188 if (codec == AV_CODEC_ID_ADPCM_G726LE) {
189 if (id == MKBETAG('7','2','6','2')) {
190 bps = 2;
191 } else {
192 const uint8_t bpcss[] = {4, 0, 3, 5};
193 av_assert0(id >= 23 && id < 23 + 4);
194 ba = bpcss[id - 23];
195 bps = bpcss[id - 23];
196 }
197 } else if (!bps) {
198 avpriv_request_sample(s, "Unknown bits per sample");
199 return AVERROR_PATCHWELCOME;
200 }
201
202 if (channels == 0 || channels >= INT_MAX / (BLOCK_SIZE * bps >> 3)) {
203 av_log(s, AV_LOG_ERROR, "Invalid number of channels %u\n", channels);
204 return AVERROR_INVALIDDATA;
205 }
206
207 if (rate == 0 || rate > INT_MAX) {
208 av_log(s, AV_LOG_ERROR, "Invalid sample rate: %u\n", rate);
209 return AVERROR_INVALIDDATA;
210 }
211
212 st = avformat_new_stream(s, NULL);
213 if (!st)
214 return AVERROR(ENOMEM);
215 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
216 st->codecpar->codec_tag = id;
217 st->codecpar->codec_id = codec;
218 st->codecpar->ch_layout.nb_channels = channels;
219 st->codecpar->sample_rate = rate;
220 st->codecpar->bits_per_coded_sample = bps;
221 st->codecpar->bit_rate = channels * rate * bps;
222 st->codecpar->block_align = ba ? ba : FFMAX(bps * channels / 8, 1);
223 if (data_size != AU_UNKNOWN_SIZE)
224 st->duration = (((int64_t)data_size)<<3) / (channels * (int64_t)bps);
225
226 st->start_time = 0;
227 avpriv_set_pts_info(st, 64, 1, rate);
228
229 return 0;
230 }
231
232 const AVInputFormat ff_au_demuxer = {
233 .name = "au",
234 .long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
235 .read_probe = au_probe,
236 .read_header = au_read_header,
237 .read_packet = ff_pcm_read_packet,
238 .read_seek = ff_pcm_read_seek,
239 .codec_tag = au_codec_tags,
240 };
241
242 #endif /* CONFIG_AU_DEMUXER */
243
244 #if CONFIG_AU_MUXER
245
246 typedef struct AUContext {
247 uint32_t header_size;
248 } AUContext;
249
250 #include "rawenc.h"
251
au_get_annotations(AVFormatContext *s, AVBPrint *annotations)252 static int au_get_annotations(AVFormatContext *s, AVBPrint *annotations)
253 {
254 static const char keys[][7] = {
255 "Title",
256 "Artist",
257 "Album",
258 "Track",
259 "Genre",
260 };
261 int cnt = 0;
262 AVDictionary *m = s->metadata;
263 AVDictionaryEntry *t = NULL;
264
265 for (int i = 0; i < FF_ARRAY_ELEMS(keys); i++) {
266 t = av_dict_get(m, keys[i], NULL, 0);
267 if (t != NULL) {
268 if (cnt++)
269 av_bprint_chars(annotations, '\n', 1);
270 av_bprintf(annotations, "%s=%s", keys[i], t->value);
271 }
272 }
273 /* The specification requires the annotation field to be zero-terminated
274 * and its length to be a multiple of eight, so pad with 0's */
275 av_bprint_chars(annotations, '\0', 8);
276 return av_bprint_is_complete(annotations) ? 0 : AVERROR(ENOMEM);
277 }
278
au_write_header(AVFormatContext *s)279 static int au_write_header(AVFormatContext *s)
280 {
281 int ret;
282 AUContext *au = s->priv_data;
283 AVIOContext *pb = s->pb;
284 AVCodecParameters *par = s->streams[0]->codecpar;
285 AVBPrint annotations;
286
287 if (s->nb_streams != 1) {
288 av_log(s, AV_LOG_ERROR, "only one stream is supported\n");
289 return AVERROR(EINVAL);
290 }
291
292 par->codec_tag = ff_codec_get_tag(codec_au_tags, par->codec_id);
293 if (!par->codec_tag) {
294 av_log(s, AV_LOG_ERROR, "unsupported codec\n");
295 return AVERROR(EINVAL);
296 }
297
298 av_bprint_init(&annotations, 0, INT_MAX - 24);
299 ret = au_get_annotations(s, &annotations);
300 if (ret < 0)
301 goto fail;
302 au->header_size = 24 + annotations.len & ~7;
303
304 ffio_wfourcc(pb, ".snd"); /* magic number */
305 avio_wb32(pb, au->header_size); /* header size */
306 avio_wb32(pb, AU_UNKNOWN_SIZE); /* data size */
307 avio_wb32(pb, par->codec_tag); /* codec ID */
308 avio_wb32(pb, par->sample_rate);
309 avio_wb32(pb, par->ch_layout.nb_channels);
310 avio_write(pb, annotations.str, annotations.len & ~7);
311
312 fail:
313 av_bprint_finalize(&annotations, NULL);
314
315 return ret;
316 }
317
au_write_trailer(AVFormatContext *s)318 static int au_write_trailer(AVFormatContext *s)
319 {
320 AVIOContext *pb = s->pb;
321 AUContext *au = s->priv_data;
322 int64_t file_size = avio_tell(pb);
323
324 if ((s->pb->seekable & AVIO_SEEKABLE_NORMAL) && file_size < INT32_MAX) {
325 /* update file size */
326 avio_seek(pb, 8, SEEK_SET);
327 avio_wb32(pb, (uint32_t)(file_size - au->header_size));
328 avio_seek(pb, file_size, SEEK_SET);
329 }
330
331 return 0;
332 }
333
334 const AVOutputFormat ff_au_muxer = {
335 .name = "au",
336 .long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
337 .mime_type = "audio/basic",
338 .extensions = "au",
339 .priv_data_size = sizeof(AUContext),
340 .audio_codec = AV_CODEC_ID_PCM_S16BE,
341 .video_codec = AV_CODEC_ID_NONE,
342 .write_header = au_write_header,
343 .write_packet = ff_raw_write_packet,
344 .write_trailer = au_write_trailer,
345 .codec_tag = au_codec_tags,
346 .flags = AVFMT_NOTIMESTAMPS,
347 };
348
349 #endif /* CONFIG_AU_MUXER */
350