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 {
26 struct mp4_callback cb;
29 static ssize_t aac_afh_read_cb(void *user_data, void *dest, size_t want)
31 struct aac_afh_context *c = user_data;
34 if (want == 0 || c->fpos >= c->mapsize)
36 have = c->mapsize - c->fpos;
37 rv = PARA_MIN(have, want);
38 PARA_DEBUG_LOG("reading %zu bytes @%zu\n", rv, c->fpos);
39 memcpy(dest, c->map + c->fpos, rv);
44 static off_t aac_afh_seek_cb(void *user_data, off_t offset, int whence)
46 struct aac_afh_context *c = user_data;
48 if (whence == SEEK_SET)
50 else if (whence == SEEK_CUR)
52 else if (whence == SEEK_END)
53 c->fpos = c->mapsize + offset;
59 static int aac_afh_open(const void *map, size_t mapsize, void **afh_context)
62 struct aac_afh_context *c = para_malloc(sizeof(*c));
67 c->cb.read = aac_afh_read_cb;
68 c->cb.seek = aac_afh_seek_cb;
71 ret = mp4_open_read(&c->cb, &c->mp4);
82 static void aac_afh_close(void *afh_context)
84 struct aac_afh_context *c = afh_context;
89 static int aac_afh_get_chunk(uint32_t chunk_num, void *afh_context,
90 const char **buf, uint32_t *len)
92 struct aac_afh_context *c = afh_context;
97 ret = mp4_set_sample_position(c->mp4, chunk_num);
101 ret = mp4_get_sample_size(c->mp4, chunk_num, &ss);
104 assert(ss + offset <= c->mapsize);
105 *buf = c->map + offset;
110 static void aac_afh_get_taginfo(const struct mp4 *mp4, struct taginfo *tags)
112 tags->artist = mp4_get_tag_value(mp4, "artist");
113 tags->title = mp4_get_tag_value(mp4, "title");
114 tags->year = mp4_get_tag_value(mp4, "date");
115 tags->album = mp4_get_tag_value(mp4, "album");
116 tags->comment = mp4_get_tag_value(mp4, "comment");
120 * Init m4a file and write some tech data to given pointers.
122 static int aac_get_file_info(char *map, size_t numbytes, __a_unused int fd,
123 struct afh_info *afhi)
127 struct aac_afh_context *c;
128 uint64_t milliseconds;
132 ret = aac_afh_open(map, numbytes, (void **)&c);
136 ret = -E_MP4_BAD_SAMPLERATE;
137 rv = mp4_get_sample_rate(c->mp4);
140 afhi->frequency = rv;
142 afhi->channels = mp4_get_channel_count(c->mp4);
143 assert(afhi->channels > 0);
145 ret = -E_MP4_BAD_SAMPLE_COUNT;
146 rv = mp4_num_samples(c->mp4);
149 afhi->chunks_total = rv;
150 afhi->max_chunk_size = 0;
151 for (n = 0; n < afhi->chunks_total; n++) {
152 if (aac_afh_get_chunk(n, c, &buf, &len) < 0)
154 afhi->max_chunk_size = PARA_MAX(afhi->max_chunk_size, len);
156 milliseconds = mp4_get_duration(c->mp4);
157 afhi->seconds_total = milliseconds / 1000;
158 ms2tv(milliseconds / afhi->chunks_total, &afhi->chunk_tv);
159 if (aac_afh_get_chunk(0, c, &buf, &len) >= 0)
160 numbytes -= buf - map;
161 afhi->bitrate = 8 * numbytes / afhi->seconds_total / 1000;
162 aac_afh_get_taginfo(c->mp4, &afhi->tags);
169 static ssize_t aac_afh_meta_read_cb(void *user_data, void *dest, size_t want)
171 int fd = *(int *)user_data;
172 return read(fd, dest, want);
175 static off_t aac_afh_meta_seek_cb(void *user_data, off_t offset, int whence)
177 int fd = *(int *)user_data;
178 off_t ret = lseek(fd, offset, whence);
180 assert(ret != (off_t)-1);
184 static ssize_t aac_afh_meta_write_cb(void *user_data, void *dest, size_t count)
186 int fd = *(int *)user_data;
187 return write(fd, dest, count);
190 static int aac_afh_meta_truncate_cb(void *user_data)
192 int fd = *(int *)user_data;
193 off_t offset = lseek(fd, 0, SEEK_CUR);
194 return ftruncate(fd, offset);
197 static void replace_or_add_tag(const char *item, const char *value,
198 struct mp4_metadata *meta)
203 for (n = 0; n < meta->count; n++) {
205 if (strcasecmp(t->item, item))
208 t->value = para_strdup(value);
211 /* item not found, add new tag */
212 meta->tags = para_realloc(meta->tags, (meta->count + 1)
213 * sizeof(struct mp4_tag));
214 t = meta->tags + meta->count;
215 t->item = para_strdup(item);
216 t->value = para_strdup(value);
220 static int aac_afh_rewrite_tags(const char *map, size_t mapsize,
221 struct taginfo *tags, int fd, __a_unused const char *filename)
224 struct mp4_metadata *metadata;
226 struct mp4_callback cb = {
227 .read = aac_afh_meta_read_cb,
228 .seek = aac_afh_meta_seek_cb,
229 .write = aac_afh_meta_write_cb,
230 .truncate = aac_afh_meta_truncate_cb,
234 ret = write_all(fd, map, mapsize);
237 lseek(fd, 0, SEEK_SET);
239 ret = mp4_open_meta(&cb, &mp4);
242 metadata = mp4_get_meta(mp4);
243 PARA_NOTICE_LOG("%u metadata item(s) found\n", metadata->count);
244 replace_or_add_tag("artist", tags->artist, metadata);
245 replace_or_add_tag("title", tags->title, metadata);
246 replace_or_add_tag("album", tags->album, metadata);
247 replace_or_add_tag("date", tags->year, metadata);
248 replace_or_add_tag("comment", tags->comment, metadata);
249 ret = mp4_meta_update(mp4);
254 static const char * const aac_suffixes[] = {"m4a", "mp4", NULL};
257 * The audio format handler for the Advanced Audio Codec.
259 * This is only compiled in if the faad library is installed.
261 const struct audio_format_handler aac_afh = {
262 .get_file_info = aac_get_file_info,
263 .suffixes = aac_suffixes,
264 .rewrite_tags = aac_afh_rewrite_tags,
265 .open = aac_afh_open,
266 .get_chunk = aac_afh_get_chunk,
267 .close = aac_afh_close,