summaryrefslogtreecommitdiff
path: root/libavformat/au.c (plain)
blob: 520824fc123ac11b31a1800da29e711fda3042cb
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
41static 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
60static int au_probe(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
69static 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 c = avio_r8(pb);
90 switch(state) {
91 case PARSE_KEY:
92 if (c == '\0') {
93 state = PARSE_FINISHED;
94 } else if (c == '=') {
95 av_bprint_finalize(&bprint, &key);
96 av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
97 state = PARSE_VALUE;
98 } else {
99 av_bprint_chars(&bprint, c, 1);
100 }
101 break;
102 case PARSE_VALUE:
103 if (c == '\0' || c == '\n') {
104 if (av_bprint_finalize(&bprint, &value) != 0) {
105 av_log(s, AV_LOG_ERROR, "Memory error while parsing AU metadata.\n");
106 } else {
107 av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
108 for (i = 0; keys[i] != NULL && key != NULL; i++) {
109 if (av_strcasecmp(keys[i], key) == 0) {
110 av_dict_set(&(s->metadata), keys[i], value, AV_DICT_DONT_STRDUP_VAL);
111 av_freep(&key);
112 value = NULL;
113 }
114 }
115 }
116 av_freep(&key);
117 av_freep(&value);
118 state = (c == '\0') ? PARSE_FINISHED : PARSE_KEY;
119 } else {
120 av_bprint_chars(&bprint, c, 1);
121 }
122 break;
123 case PARSE_FINISHED:
124 break;
125 default:
126 /* should never happen */
127 av_assert0(0);
128 }
129 }
130 av_bprint_finalize(&bprint, NULL);
131 av_freep(&key);
132 return 0;
133}
134
135#define BLOCK_SIZE 1024
136
137static int au_read_header(AVFormatContext *s)
138{
139 int size, data_size = 0;
140 unsigned int tag;
141 AVIOContext *pb = s->pb;
142 unsigned int id, channels, rate;
143 int bps;
144 enum AVCodecID codec;
145 AVStream *st;
146
147 tag = avio_rl32(pb);
148 if (tag != MKTAG('.', 's', 'n', 'd'))
149 return AVERROR_INVALIDDATA;
150 size = avio_rb32(pb); /* header size */
151 data_size = avio_rb32(pb); /* data size in bytes */
152
153 if (data_size < 0 && data_size != AU_UNKNOWN_SIZE) {
154 av_log(s, AV_LOG_ERROR, "Invalid negative data size '%d' found\n", data_size);
155 return AVERROR_INVALIDDATA;
156 }
157
158 id = avio_rb32(pb);
159 rate = avio_rb32(pb);
160 channels = avio_rb32(pb);
161
162 if (size > 24) {
163 /* parse annotation field to get metadata */
164 au_read_annotation(s, size - 24);
165 }
166
167 codec = ff_codec_get_id(codec_au_tags, id);
168
169 if (codec == AV_CODEC_ID_NONE) {
170 avpriv_request_sample(s, "unknown or unsupported codec tag: %u", id);
171 return AVERROR_PATCHWELCOME;
172 }
173
174 bps = av_get_bits_per_sample(codec);
175 if (codec == AV_CODEC_ID_ADPCM_G726LE) {
176 if (id == MKBETAG('7','2','6','2')) {
177 bps = 2;
178 } else {
179 const uint8_t bpcss[] = {4, 0, 3, 5};
180 av_assert0(id >= 23 && id < 23 + 4);
181 bps = bpcss[id - 23];
182 }
183 } else if (!bps) {
184 avpriv_request_sample(s, "Unknown bits per sample");
185 return AVERROR_PATCHWELCOME;
186 }
187
188 if (channels == 0 || channels >= INT_MAX / (BLOCK_SIZE * bps >> 3)) {
189 av_log(s, AV_LOG_ERROR, "Invalid number of channels %u\n", channels);
190 return AVERROR_INVALIDDATA;
191 }
192
193 if (rate == 0 || rate > INT_MAX) {
194 av_log(s, AV_LOG_ERROR, "Invalid sample rate: %u\n", rate);
195 return AVERROR_INVALIDDATA;
196 }
197
198 st = avformat_new_stream(s, NULL);
199 if (!st)
200 return AVERROR(ENOMEM);
201 st->codecpar->codec_type = AVMEDIA_TYPE_AUDIO;
202 st->codecpar->codec_tag = id;
203 st->codecpar->codec_id = codec;
204 st->codecpar->channels = channels;
205 st->codecpar->sample_rate = rate;
206 st->codecpar->bits_per_coded_sample = bps;
207 st->codecpar->bit_rate = channels * rate * bps;
208 st->codecpar->block_align = FFMAX(bps * st->codecpar->channels / 8, 1);
209 if (data_size != AU_UNKNOWN_SIZE)
210 st->duration = (((int64_t)data_size)<<3) / (st->codecpar->channels * (int64_t)bps);
211
212 st->start_time = 0;
213 avpriv_set_pts_info(st, 64, 1, rate);
214
215 return 0;
216}
217
218AVInputFormat ff_au_demuxer = {
219 .name = "au",
220 .long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
221 .read_probe = au_probe,
222 .read_header = au_read_header,
223 .read_packet = ff_pcm_read_packet,
224 .read_seek = ff_pcm_read_seek,
225 .codec_tag = (const AVCodecTag* const []) { codec_au_tags, 0 },
226};
227
228#endif /* CONFIG_AU_DEMUXER */
229
230#if CONFIG_AU_MUXER
231
232typedef struct AUContext {
233 uint32_t header_size;
234} AUContext;
235
236#include "rawenc.h"
237
238static int au_get_annotations(AVFormatContext *s, char **buffer)
239{
240 static const char * keys[] = {
241 "Title",
242 "Artist",
243 "Album",
244 "Track",
245 "Genre",
246 NULL };
247 int i;
248 int cnt = 0;
249 AVDictionary *m = s->metadata;
250 AVDictionaryEntry *t = NULL;
251 AVBPrint bprint;
252
253 av_bprint_init(&bprint, 64, AV_BPRINT_SIZE_UNLIMITED);
254
255 for (i = 0; keys[i] != NULL; i++) {
256 t = av_dict_get(m, keys[i], NULL, 0);
257 if (t != NULL) {
258 if (cnt++)
259 av_bprint_chars(&bprint, '\n', 1);
260 av_bprint_append_data(&bprint, keys[i], strlen(keys[i]));
261 av_bprint_chars(&bprint, '=', 1);
262 av_bprint_append_data(&bprint, t->value, strlen(t->value));
263 }
264 }
265 /* pad with 0's */
266 av_bprint_append_data(&bprint, "\0\0\0\0\0\0\0\0", 8);
267 return av_bprint_finalize(&bprint, buffer);
268}
269
270static int au_write_header(AVFormatContext *s)
271{
272 int ret;
273 AUContext *au = s->priv_data;
274 AVIOContext *pb = s->pb;
275 AVCodecParameters *par = s->streams[0]->codecpar;
276 char *annotations = NULL;
277
278 au->header_size = AU_DEFAULT_HEADER_SIZE;
279
280 if (s->nb_streams != 1) {
281 av_log(s, AV_LOG_ERROR, "only one stream is supported\n");
282 return AVERROR(EINVAL);
283 }
284
285 par->codec_tag = ff_codec_get_tag(codec_au_tags, par->codec_id);
286 if (!par->codec_tag) {
287 av_log(s, AV_LOG_ERROR, "unsupported codec\n");
288 return AVERROR(EINVAL);
289 }
290
291 if (av_dict_count(s->metadata) > 0) {
292 ret = au_get_annotations(s, &annotations);
293 if (ret < 0)
294 return ret;
295 if (annotations != NULL) {
296 au->header_size = (24 + strlen(annotations) + 8) & ~7;
297 if (au->header_size < AU_DEFAULT_HEADER_SIZE)
298 au->header_size = AU_DEFAULT_HEADER_SIZE;
299 }
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 if (annotations != NULL) {
308 avio_write(pb, annotations, au->header_size - 24);
309 av_freep(&annotations);
310 } else {
311 avio_wb64(pb, 0); /* annotation field */
312 }
313 avio_flush(pb);
314
315 return 0;
316}
317
318static 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 avio_flush(pb);
330 }
331
332 return 0;
333}
334
335AVOutputFormat ff_au_muxer = {
336 .name = "au",
337 .long_name = NULL_IF_CONFIG_SMALL("Sun AU"),
338 .mime_type = "audio/basic",
339 .extensions = "au",
340 .priv_data_size = sizeof(AUContext),
341 .audio_codec = AV_CODEC_ID_PCM_S16BE,
342 .video_codec = AV_CODEC_ID_NONE,
343 .write_header = au_write_header,
344 .write_packet = ff_raw_write_packet,
345 .write_trailer = au_write_trailer,
346 .codec_tag = (const AVCodecTag* const []) { codec_au_tags, 0 },
347 .flags = AVFMT_NOTIMESTAMPS,
348};
349
350#endif /* CONFIG_AU_MUXER */
351
generated by cgit at 2024-05-17 06:09:27 (GMT)