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;
107 assert(chunk_num <= INT_MAX);
108 mp4_set_sample_position(c->mp4, c->track, chunk_num);
110 ss = mp4_get_sample_size(c->mp4, c->track, chunk_num);
112 return -E_MP4_BAD_SAMPLE;
113 assert(ss + offset <= c->mapsize);
114 *buf = c->map + offset;
119 static void _aac_afh_get_taginfo(const struct mp4 *mp4, struct taginfo *tags)
121 tags->artist = mp4_meta_get_artist(mp4);
122 tags->title = mp4_meta_get_title(mp4);
123 tags->year = mp4_meta_get_date(mp4);
124 tags->album = mp4_meta_get_album(mp4);
125 tags->comment = mp4_meta_get_comment(mp4);
129 * Init m4a file and write some tech data to given pointers.
131 static int aac_get_file_info(char *map, size_t numbytes, __a_unused int fd,
132 struct afh_info *afhi)
136 struct aac_afh_context *c;
137 uint64_t milliseconds;
141 ret = aac_afh_open(map, numbytes, (void **)&c);
145 ret = -E_MP4_BAD_SAMPLERATE;
146 rv = mp4_get_sample_rate(c->mp4, c->track);
149 afhi->frequency = rv;
151 ret = -E_MP4_BAD_CHANNEL_COUNT;
152 rv = mp4_get_channel_count(c->mp4, c->track);
157 ret = -E_MP4_BAD_SAMPLE_COUNT;
158 rv = mp4_num_samples(c->mp4, c->track);
161 afhi->chunks_total = rv;
162 afhi->max_chunk_size = 0;
163 for (n = 0; n < afhi->chunks_total; n++) {
164 if (aac_afh_get_chunk(n, c, &buf, &len) < 0)
166 afhi->max_chunk_size = PARA_MAX(afhi->max_chunk_size, len);
168 milliseconds = mp4_get_duration(c->mp4, c->track);
169 afhi->seconds_total = milliseconds / 1000;
170 ms2tv(milliseconds / afhi->chunks_total, &afhi->chunk_tv);
171 if (aac_afh_get_chunk(0, c, &buf, &len) >= 0)
172 numbytes -= buf - map;
173 afhi->bitrate = 8 * numbytes / afhi->seconds_total / 1000;
174 _aac_afh_get_taginfo(c->mp4, &afhi->tags);
181 static ssize_t aac_afh_meta_read_cb(void *user_data, void *dest, size_t want)
183 int fd = *(int *)user_data;
184 return read(fd, dest, want);
187 static uint32_t aac_afh_meta_seek_cb(void *user_data, uint64_t pos)
189 int fd = *(int *)user_data;
190 return lseek(fd, pos, SEEK_SET);
193 static uint32_t aac_afh_meta_write_cb(void *user_data, void *dest, uint32_t want)
195 int fd = *(int *)user_data;
196 return write(fd, dest, want);
199 static uint32_t aac_afh_meta_truncate_cb(void *user_data)
201 int fd = *(int *)user_data;
202 off_t offset = lseek(fd, 0, SEEK_CUR);
203 return ftruncate(fd, offset);
206 static void replace_or_add_tag(const char *item, const char *value,
207 struct mp4_metadata *meta)
212 for (n = 0; n < meta->count; n++) {
214 if (strcasecmp(t->item, item))
217 t->value = para_strdup(value);
220 /* item not found, add new tag */
221 meta->tags = para_realloc(meta->tags, (meta->count + 1)
222 * sizeof(struct mp4_tag));
223 t = meta->tags + meta->count;
224 t->item = para_strdup(item);
225 t->value = para_strdup(value);
229 static int aac_afh_rewrite_tags(const char *map, size_t mapsize,
230 struct taginfo *tags, int fd, __a_unused const char *filename)
233 struct mp4_metadata *metadata;
235 struct mp4_callback cb = {
236 .read = aac_afh_meta_read_cb,
237 .seek = aac_afh_meta_seek_cb,
238 .write = aac_afh_meta_write_cb,
239 .truncate = aac_afh_meta_truncate_cb,
243 ret = write_all(fd, map, mapsize);
246 lseek(fd, 0, SEEK_SET);
248 mp4 = mp4_open_meta(&cb);
251 metadata = mp4_get_meta(mp4);
252 PARA_NOTICE_LOG("%u metadata item(s) found\n", metadata->count);
253 replace_or_add_tag("artist", tags->artist, metadata);
254 replace_or_add_tag("title", tags->title, metadata);
255 replace_or_add_tag("album", tags->album, metadata);
256 replace_or_add_tag("date", tags->year, metadata);
257 replace_or_add_tag("comment", tags->comment, metadata);
258 ret = -E_MP4_META_WRITE;
259 if (!mp4_meta_update(mp4))
267 static const char * const aac_suffixes[] = {"m4a", "mp4", NULL};
270 * The audio format handler for the Advanced Audio Codec.
272 * This is only compiled in if the faad library is installed.
274 const struct audio_format_handler aac_afh = {
275 .get_file_info = aac_get_file_info,
276 .suffixes = aac_suffixes,
277 .rewrite_tags = aac_afh_rewrite_tags,
278 .open = aac_afh_open,
279 .get_chunk = aac_afh_get_chunk,
280 .close = aac_afh_close,