1 /* Copyright (C) 2006 Andre Noll <maan@tuebingen.mpg.de>, see file COPYING. */
3 * based in parts on libfaad, Copyright (C) 2003-2005 M. Bakker,
7 /** \file aac_afh.c para_server's aac audio format handler. */
15 #include "portable_io.h"
21 struct aac_afh_context {
27 struct mp4_callback cb;
30 static ssize_t aac_afh_read_cb(void *user_data, void *dest, size_t want)
32 struct aac_afh_context *c = user_data;
35 if (want == 0 || c->fpos >= c->mapsize)
37 have = c->mapsize - c->fpos;
38 rv = PARA_MIN(have, want);
39 PARA_DEBUG_LOG("reading %zu bytes @%zu\n", rv, c->fpos);
40 memcpy(dest, c->map + c->fpos, rv);
45 static uint32_t aac_afh_seek_cb(void *user_data, uint64_t pos)
47 struct aac_afh_context *c = user_data;
52 static int32_t aac_afh_get_track(struct mp4 *mp4)
54 int32_t i, num_tracks = mp4_get_total_tracks(mp4);
56 assert(num_tracks >= 0);
57 for (i = 0; i < num_tracks; i++)
58 if (mp4_is_audio_track(mp4, i))
60 return -E_MP4_TRACK; /* no audio track */
63 static int aac_afh_open(const void *map, size_t mapsize, void **afh_context)
66 struct aac_afh_context *c = para_malloc(sizeof(*c));
71 c->cb.read = aac_afh_read_cb;
72 c->cb.seek = aac_afh_seek_cb;
76 c->mp4 = mp4_open_read(&c->cb);
79 ret = aac_afh_get_track(c->mp4);
93 static void aac_afh_close(void *afh_context)
95 struct aac_afh_context *c = afh_context;
100 static int aac_afh_get_chunk(uint32_t chunk_num, void *afh_context,
101 const char **buf, uint32_t *len)
103 struct aac_afh_context *c = afh_context;
108 ret = mp4_set_sample_position(c->mp4, c->track, chunk_num);
112 ss = mp4_get_sample_size(c->mp4, c->track, chunk_num);
114 return -E_MP4_BAD_SAMPLE;
115 assert(ss + offset <= c->mapsize);
116 *buf = c->map + offset;
121 static void _aac_afh_get_taginfo(const struct mp4 *mp4, struct taginfo *tags)
123 tags->artist = mp4_meta_get_artist(mp4);
124 tags->title = mp4_meta_get_title(mp4);
125 tags->year = mp4_meta_get_date(mp4);
126 tags->album = mp4_meta_get_album(mp4);
127 tags->comment = mp4_meta_get_comment(mp4);
131 * Init m4a file and write some tech data to given pointers.
133 static int aac_get_file_info(char *map, size_t numbytes, __a_unused int fd,
134 struct afh_info *afhi)
138 struct aac_afh_context *c;
139 uint64_t milliseconds;
143 ret = aac_afh_open(map, numbytes, (void **)&c);
147 ret = -E_MP4_BAD_SAMPLERATE;
148 rv = mp4_get_sample_rate(c->mp4, c->track);
151 afhi->frequency = rv;
153 ret = -E_MP4_BAD_CHANNEL_COUNT;
154 rv = mp4_get_channel_count(c->mp4, c->track);
159 ret = -E_MP4_BAD_SAMPLE_COUNT;
160 rv = mp4_num_samples(c->mp4, c->track);
163 afhi->chunks_total = rv;
164 afhi->max_chunk_size = 0;
165 for (n = 0; n < afhi->chunks_total; n++) {
166 if (aac_afh_get_chunk(n, c, &buf, &len) < 0)
168 afhi->max_chunk_size = PARA_MAX(afhi->max_chunk_size, len);
170 milliseconds = mp4_get_duration(c->mp4, c->track);
171 afhi->seconds_total = milliseconds / 1000;
172 ms2tv(milliseconds / afhi->chunks_total, &afhi->chunk_tv);
173 if (aac_afh_get_chunk(0, c, &buf, &len) >= 0)
174 numbytes -= buf - map;
175 afhi->bitrate = 8 * numbytes / afhi->seconds_total / 1000;
176 _aac_afh_get_taginfo(c->mp4, &afhi->tags);
183 static ssize_t aac_afh_meta_read_cb(void *user_data, void *dest, size_t want)
185 int fd = *(int *)user_data;
186 return read(fd, dest, want);
189 static uint32_t aac_afh_meta_seek_cb(void *user_data, uint64_t pos)
191 int fd = *(int *)user_data;
192 return lseek(fd, pos, SEEK_SET);
195 static uint32_t aac_afh_meta_write_cb(void *user_data, void *dest, uint32_t want)
197 int fd = *(int *)user_data;
198 return write(fd, dest, want);
201 static uint32_t aac_afh_meta_truncate_cb(void *user_data)
203 int fd = *(int *)user_data;
204 off_t offset = lseek(fd, 0, SEEK_CUR);
205 return ftruncate(fd, offset);
208 static void replace_or_add_tag(const char *item, const char *value,
209 struct mp4_metadata *meta)
214 for (n = 0; n < meta->count; n++) {
216 if (strcasecmp(t->item, item))
219 t->value = para_strdup(value);
222 /* item not found, add new tag */
223 meta->tags = para_realloc(meta->tags, (meta->count + 1)
224 * sizeof(struct mp4_tag));
225 t = meta->tags + meta->count;
226 t->item = para_strdup(item);
227 t->value = para_strdup(value);
231 static int aac_afh_rewrite_tags(const char *map, size_t mapsize,
232 struct taginfo *tags, int fd, __a_unused const char *filename)
235 struct mp4_metadata *metadata;
237 struct mp4_callback cb = {
238 .read = aac_afh_meta_read_cb,
239 .seek = aac_afh_meta_seek_cb,
240 .write = aac_afh_meta_write_cb,
241 .truncate = aac_afh_meta_truncate_cb,
245 ret = write_all(fd, map, mapsize);
248 lseek(fd, 0, SEEK_SET);
250 mp4 = mp4_open_meta(&cb);
253 metadata = mp4_get_meta(mp4);
254 PARA_NOTICE_LOG("%u metadata item(s) found\n", metadata->count);
255 replace_or_add_tag("artist", tags->artist, metadata);
256 replace_or_add_tag("title", tags->title, metadata);
257 replace_or_add_tag("album", tags->album, metadata);
258 replace_or_add_tag("date", tags->year, metadata);
259 replace_or_add_tag("comment", tags->comment, metadata);
260 ret = -E_MP4_META_WRITE;
261 if (!mp4_meta_update(mp4))
269 static const char * const aac_suffixes[] = {"m4a", "mp4", NULL};
272 * The audio format handler for the Advanced Audio Codec.
274 * This is only compiled in if the faad library is installed.
276 const struct audio_format_handler aac_afh = {
277 .get_file_info = aac_get_file_info,
278 .suffixes = aac_suffixes,
279 .rewrite_tags = aac_afh_rewrite_tags,
280 .open = aac_afh_open,
281 .get_chunk = aac_afh_get_chunk,
282 .close = aac_afh_close,