Revert "Makefile: Fix compilation after header removal."
[paraslash.git] / aac_afh.c
1 /* Copyright (C) 2006 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
2 /*
3 * based in parts on libfaad, Copyright (C) 2003-2005 M. Bakker,
4 * Ahead Software AG
5 */
6
7 /** \file aac_afh.c para_server's aac audio format handler. */
8
9 #include <regex.h>
10 #include <neaacdec.h>
11
12 #include "para.h"
13
14 /* To get the mp4ff_tag_t and mp4ff_metadata_t typedefs. */
15 #define USE_TAGGING
16 #include <mp4ff.h>
17
18 #include "error.h"
19 #include "portable_io.h"
20 #include "afh.h"
21 #include "string.h"
22 #include "fd.h"
23
24
25 struct aac_afh_context {
26 const void *map;
27 size_t mapsize;
28 size_t fpos;
29 int32_t track;
30 mp4ff_t *mp4ff;
31 mp4AudioSpecificConfig masc;
32 mp4ff_callback_t cb;
33 };
34
35 static uint32_t aac_afh_read_cb(void *user_data, void *dest, uint32_t want)
36 {
37 struct aac_afh_context *c = user_data;
38 size_t have, rv;
39
40 if (want == 0 || c->fpos >= c->mapsize)
41 return 0;
42 have = c->mapsize - c->fpos;
43 rv = PARA_MIN(have, (size_t)want);
44 PARA_DEBUG_LOG("reading %zu bytes @%zu\n", rv, c->fpos);
45 memcpy(dest, c->map + c->fpos, rv);
46 c->fpos += rv;
47 return rv;
48 }
49
50 static uint32_t aac_afh_seek_cb(void *user_data, uint64_t pos)
51 {
52 struct aac_afh_context *c = user_data;
53 c->fpos = pos;
54 return 0;
55 }
56
57 static int32_t aac_afh_get_track(mp4ff_t *mp4ff, mp4AudioSpecificConfig *masc)
58 {
59 int32_t i, rc, num_tracks = mp4ff_total_tracks(mp4ff);
60
61 assert(num_tracks >= 0);
62 for (i = 0; i < num_tracks; i++) {
63 unsigned char *buf = NULL;
64 unsigned buf_size = 0;
65
66 mp4ff_get_decoder_config(mp4ff, i, &buf, &buf_size);
67 if (buf) {
68 rc = NeAACDecAudioSpecificConfig(buf, buf_size, masc);
69 free(buf);
70 if (rc < 0)
71 continue;
72 return i;
73 }
74 }
75 return -1; /* no audio track */
76 }
77
78 static int aac_afh_open(const void *map, size_t mapsize, void **afh_context)
79 {
80 int ret;
81 struct aac_afh_context *c = para_malloc(sizeof(*c));
82
83 c->map = map;
84 c->mapsize = mapsize;
85 c->fpos = 0;
86 c->cb.read = aac_afh_read_cb;
87 c->cb.seek = aac_afh_seek_cb;
88 c->cb.user_data = c;
89
90 ret = -E_MP4FF_OPEN;
91 c->mp4ff = mp4ff_open_read(&c->cb);
92 if (!c->mp4ff)
93 goto free_ctx;
94 c->track = aac_afh_get_track(c->mp4ff, &c->masc);
95 ret = -E_MP4FF_TRACK;
96 if (c->track < 0)
97 goto close_mp4ff;
98 *afh_context = c;
99 return 0;
100 close_mp4ff:
101 mp4ff_close(c->mp4ff);
102 free_ctx:
103 free(c);
104 *afh_context = NULL;
105 return ret;
106 }
107
108 static void aac_afh_close(void *afh_context)
109 {
110 struct aac_afh_context *c = afh_context;
111 mp4ff_close(c->mp4ff);
112 free(c);
113 }
114
115 /**
116 * Libmp4ff function to reposition the file to the given sample.
117 *
118 * \param f The opaque handle returned by mp4ff_open_read().
119 * \param track The number of the (audio) track.
120 * \param sample Destination.
121 *
122 * We need this function to obtain the offset of the sample within the audio
123 * file. Unfortunately, it is not exposed in the mp4ff header.
124 *
125 * \return This function always returns 0.
126 */
127 int32_t mp4ff_set_sample_position(mp4ff_t *f, const int32_t track, const int32_t sample);
128
129 static int aac_afh_get_chunk(uint32_t chunk_num, void *afh_context,
130 const char **buf, uint32_t *len)
131 {
132 struct aac_afh_context *c = afh_context;
133 int32_t ss;
134 size_t offset;
135
136 assert(chunk_num <= INT_MAX);
137 /* this function always returns zero */
138 mp4ff_set_sample_position(c->mp4ff, c->track, chunk_num);
139 offset = c->fpos;
140 ss = mp4ff_read_sample_getsize(c->mp4ff, c->track, chunk_num);
141 if (ss <= 0)
142 return -E_MP4FF_BAD_SAMPLE;
143 assert(ss + offset <= c->mapsize);
144 *buf = c->map + offset;
145 *len = ss;
146 return 1;
147 }
148
149 static void _aac_afh_get_taginfo(const mp4ff_t *mp4ff, struct taginfo *tags)
150 {
151 mp4ff_meta_get_artist(mp4ff, &tags->artist);
152 mp4ff_meta_get_title(mp4ff, &tags->title);
153 mp4ff_meta_get_date(mp4ff, &tags->year);
154 mp4ff_meta_get_album(mp4ff, &tags->album);
155 mp4ff_meta_get_comment(mp4ff, &tags->comment);
156 }
157
158 /*
159 * Init m4a file and write some tech data to given pointers.
160 */
161 static int aac_get_file_info(char *map, size_t numbytes, __a_unused int fd,
162 struct afh_info *afhi)
163 {
164 int ret;
165 int32_t rv;
166 struct aac_afh_context *c;
167 int64_t tmp;
168 const char *buf;
169 uint32_t n, len;
170
171 ret = aac_afh_open(map, numbytes, (void **)&c);
172 if (ret < 0)
173 return ret;
174
175 ret = -E_MP4FF_BAD_SAMPLERATE;
176 rv = mp4ff_get_sample_rate(c->mp4ff, c->track);
177 if (rv <= 0)
178 goto close;
179 afhi->frequency = rv;
180
181 ret = -E_MP4FF_BAD_CHANNEL_COUNT;
182 rv = mp4ff_get_channel_count(c->mp4ff, c->track);
183 if (rv <= 0)
184 goto close;
185 afhi->channels = rv;
186
187 ret = -E_MP4FF_BAD_SAMPLE_COUNT;
188 rv = mp4ff_num_samples(c->mp4ff, c->track);
189 if (rv <= 0)
190 goto close;
191 afhi->chunks_total = rv;
192 afhi->max_chunk_size = 0;
193 for (n = 0; n < afhi->chunks_total; n++) {
194 if (aac_afh_get_chunk(n, c, &buf, &len) < 0)
195 break;
196 afhi->max_chunk_size = PARA_MAX(afhi->max_chunk_size, len);
197 }
198
199 tmp = c->masc.sbr_present_flag == 1? 2048 : 1024;
200 afhi->seconds_total = tmp * afhi->chunks_total / afhi->frequency;
201 ms2tv(1000 * tmp / afhi->frequency, &afhi->chunk_tv);
202
203 if (aac_afh_get_chunk(0, c, &buf, &len) >= 0)
204 numbytes -= buf - map;
205 afhi->bitrate = 8 * numbytes / afhi->seconds_total / 1000;
206 _aac_afh_get_taginfo(c->mp4ff, &afhi->tags);
207 ret = 1;
208 close:
209 aac_afh_close(c);
210 return ret;
211 }
212
213 static uint32_t aac_afh_meta_read_cb(void *user_data, void *dest, uint32_t want)
214 {
215 int fd = *(int *)user_data;
216 return read(fd, dest, want);
217 }
218
219 static uint32_t aac_afh_meta_seek_cb(void *user_data, uint64_t pos)
220 {
221 int fd = *(int *)user_data;
222 return lseek(fd, pos, SEEK_SET);
223 }
224
225 static uint32_t aac_afh_meta_write_cb(void *user_data, void *dest, uint32_t want)
226 {
227 int fd = *(int *)user_data;
228 return write(fd, dest, want);
229 }
230
231 static uint32_t aac_afh_meta_truncate_cb(void *user_data)
232 {
233 int fd = *(int *)user_data;
234 off_t offset = lseek(fd, 0, SEEK_CUR);
235 return ftruncate(fd, offset);
236 }
237
238 static void replace_tag(mp4ff_tag_t *tag, const char *new_val, bool *found)
239 {
240 free(tag->value);
241 tag->value = para_strdup(new_val);
242 *found = true;
243 }
244
245 static void add_tag(mp4ff_metadata_t *md, const char *item, const char *value)
246 {
247 md->tags[md->count].item = para_strdup(item);
248 md->tags[md->count].value = para_strdup(value);
249 md->count++;
250 }
251
252 static int aac_afh_rewrite_tags(const char *map, size_t mapsize,
253 struct taginfo *tags, int fd, __a_unused const char *filename)
254 {
255 int ret, i;
256 int32_t rv;
257 mp4ff_metadata_t metadata;
258 mp4ff_t *mp4ff;
259 mp4ff_callback_t cb = {
260 .read = aac_afh_meta_read_cb,
261 .seek = aac_afh_meta_seek_cb,
262 .write = aac_afh_meta_write_cb,
263 .truncate = aac_afh_meta_truncate_cb,
264 .user_data = &fd
265 };
266 bool found_artist = false, found_title = false, found_album = false,
267 found_year = false, found_comment = false;
268
269 ret = write_all(fd, map, mapsize);
270 if (ret < 0)
271 return ret;
272 lseek(fd, 0, SEEK_SET);
273
274 mp4ff = mp4ff_open_read_metaonly(&cb);
275 if (!mp4ff)
276 return -E_MP4FF_OPEN;
277
278 ret = -E_MP4FF_META_READ;
279 rv = mp4ff_meta_get_num_items(mp4ff);
280 if (rv < 0)
281 goto close;
282 metadata.count = rv;
283 PARA_NOTICE_LOG("%d metadata item(s) found\n", rv);
284
285 metadata.tags = para_malloc((metadata.count + 5) * sizeof(mp4ff_tag_t));
286 for (i = 0; i < metadata.count; i++) {
287 mp4ff_tag_t *tag = metadata.tags + i;
288
289 ret = -E_MP4FF_META_READ;
290 if (!mp4ff_meta_get_by_index(mp4ff, i, &tag->item, &tag->value))
291 goto free_tags;
292 PARA_INFO_LOG("found: %s: %s\n", tag->item, tag->value);
293 if (!strcmp(tag->item, "artist"))
294 replace_tag(tag, tags->artist, &found_artist);
295 else if (!strcmp(tag->item, "title"))
296 replace_tag(tag, tags->title, &found_title);
297 else if (!strcmp(tag->item, "album"))
298 replace_tag(tag, tags->album, &found_album);
299 else if (!strcmp(tag->item, "date"))
300 replace_tag(tag, tags->year, &found_year);
301 else if (!strcmp(tag->item, "comment"))
302 replace_tag(tag, tags->comment, &found_comment);
303 }
304 if (!found_artist)
305 add_tag(&metadata, "artist", tags->artist);
306 if (!found_title)
307 add_tag(&metadata, "title", tags->title);
308 if (!found_album)
309 add_tag(&metadata, "album", tags->album);
310 if (!found_year)
311 add_tag(&metadata, "date", tags->year);
312 if (!found_comment)
313 add_tag(&metadata, "comment", tags->comment);
314 ret = -E_MP4FF_META_WRITE;
315 if (!mp4ff_meta_update(&cb, &metadata))
316 goto free_tags;
317 ret = 1;
318 free_tags:
319 for (; i > 0; i--) {
320 free(metadata.tags[i - 1].item);
321 free(metadata.tags[i - 1].value);
322 }
323 free(metadata.tags);
324 close:
325 mp4ff_close(mp4ff);
326 return ret;
327 }
328
329 static const char * const aac_suffixes[] = {"m4a", "mp4", NULL};
330
331 /**
332 * The audio format handler for the Advanced Audio Codec.
333 *
334 * This is only compiled in if the faad library is installed.
335 */
336 const struct audio_format_handler aac_afh = {
337 .get_file_info = aac_get_file_info,
338 .suffixes = aac_suffixes,
339 .rewrite_tags = aac_afh_rewrite_tags,
340 .open = aac_afh_open,
341 .get_chunk = aac_afh_get_chunk,
342 .close = aac_afh_close,
343 };