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 mp4ff_callback cb;
30 static uint32_t aac_afh_read_cb(void *user_data, void *dest, uint32_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, (size_t)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 mp4ff *mp4ff)
54 int32_t i, rc, num_tracks = mp4ff_total_tracks(mp4ff);
56 assert(num_tracks >= 0);
57 for (i = 0; i < num_tracks; i++) {
58 unsigned char *buf = NULL;
59 unsigned buf_size = 0;
61 mp4ff_get_decoder_config(mp4ff, i, &buf, &buf_size);
63 mp4AudioSpecificConfig masc;
64 rc = NeAACDecAudioSpecificConfig(buf, buf_size, &masc);
71 return -1; /* no audio track */
74 static int aac_afh_open(const void *map, size_t mapsize, void **afh_context)
77 struct aac_afh_context *c = para_malloc(sizeof(*c));
82 c->cb.read = aac_afh_read_cb;
83 c->cb.seek = aac_afh_seek_cb;
87 c->mp4ff = mp4ff_open_read(&c->cb);
90 c->track = aac_afh_get_track(c->mp4ff);
97 mp4ff_close(c->mp4ff);
104 static void aac_afh_close(void *afh_context)
106 struct aac_afh_context *c = afh_context;
107 mp4ff_close(c->mp4ff);
111 static int aac_afh_get_chunk(uint32_t chunk_num, void *afh_context,
112 const char **buf, uint32_t *len)
114 struct aac_afh_context *c = afh_context;
118 assert(chunk_num <= INT_MAX);
119 mp4ff_set_sample_position(c->mp4ff, c->track, chunk_num);
121 ss = mp4ff_get_sample_size(c->mp4ff, c->track, chunk_num);
123 return -E_MP4FF_BAD_SAMPLE;
124 assert(ss + offset <= c->mapsize);
125 *buf = c->map + offset;
130 static void _aac_afh_get_taginfo(const struct mp4ff *mp4ff, struct taginfo *tags)
132 mp4ff_meta_get_artist(mp4ff, &tags->artist);
133 mp4ff_meta_get_title(mp4ff, &tags->title);
134 mp4ff_meta_get_date(mp4ff, &tags->year);
135 mp4ff_meta_get_album(mp4ff, &tags->album);
136 mp4ff_meta_get_comment(mp4ff, &tags->comment);
140 * Init m4a file and write some tech data to given pointers.
142 static int aac_get_file_info(char *map, size_t numbytes, __a_unused int fd,
143 struct afh_info *afhi)
147 struct aac_afh_context *c;
148 uint64_t milliseconds;
152 ret = aac_afh_open(map, numbytes, (void **)&c);
156 ret = -E_MP4FF_BAD_SAMPLERATE;
157 rv = mp4ff_get_sample_rate(c->mp4ff, c->track);
160 afhi->frequency = rv;
162 ret = -E_MP4FF_BAD_CHANNEL_COUNT;
163 rv = mp4ff_get_channel_count(c->mp4ff, c->track);
168 ret = -E_MP4FF_BAD_SAMPLE_COUNT;
169 rv = mp4ff_num_samples(c->mp4ff, c->track);
172 afhi->chunks_total = rv;
173 afhi->max_chunk_size = 0;
174 for (n = 0; n < afhi->chunks_total; n++) {
175 if (aac_afh_get_chunk(n, c, &buf, &len) < 0)
177 afhi->max_chunk_size = PARA_MAX(afhi->max_chunk_size, len);
179 milliseconds = mp4ff_get_duration(c->mp4ff, c->track);
180 afhi->seconds_total = milliseconds / 1000;
181 ms2tv(milliseconds / afhi->chunks_total, &afhi->chunk_tv);
182 if (aac_afh_get_chunk(0, c, &buf, &len) >= 0)
183 numbytes -= buf - map;
184 afhi->bitrate = 8 * numbytes / afhi->seconds_total / 1000;
185 _aac_afh_get_taginfo(c->mp4ff, &afhi->tags);
192 static uint32_t aac_afh_meta_read_cb(void *user_data, void *dest, uint32_t want)
194 int fd = *(int *)user_data;
195 return read(fd, dest, want);
198 static uint32_t aac_afh_meta_seek_cb(void *user_data, uint64_t pos)
200 int fd = *(int *)user_data;
201 return lseek(fd, pos, SEEK_SET);
204 static uint32_t aac_afh_meta_write_cb(void *user_data, void *dest, uint32_t want)
206 int fd = *(int *)user_data;
207 return write(fd, dest, want);
210 static uint32_t aac_afh_meta_truncate_cb(void *user_data)
212 int fd = *(int *)user_data;
213 off_t offset = lseek(fd, 0, SEEK_CUR);
214 return ftruncate(fd, offset);
217 static void replace_tag(struct mp4ff_tag *tag, const char *new_val, bool *found)
220 tag->value = para_strdup(new_val);
224 static void add_tag(struct mp4ff_metadata *md, const char *item, const char *value)
226 md->tags[md->count].item = para_strdup(item);
227 md->tags[md->count].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)
236 struct mp4ff_metadata metadata;
238 struct mp4ff_callback cb = {
239 .read = aac_afh_meta_read_cb,
240 .seek = aac_afh_meta_seek_cb,
241 .write = aac_afh_meta_write_cb,
242 .truncate = aac_afh_meta_truncate_cb,
245 bool found_artist = false, found_title = false, found_album = false,
246 found_year = false, found_comment = false;
248 ret = write_all(fd, map, mapsize);
251 lseek(fd, 0, SEEK_SET);
253 mp4ff = mp4ff_open_meta(&cb);
255 return -E_MP4FF_OPEN;
257 ret = -E_MP4FF_META_READ;
258 rv = mp4ff_meta_get_num_items(mp4ff);
262 PARA_NOTICE_LOG("%d metadata item(s) found\n", rv);
264 metadata.tags = para_malloc((metadata.count + 5) * sizeof(struct mp4ff_tag));
265 for (i = 0; i < metadata.count; i++) {
266 struct mp4ff_tag *tag = metadata.tags + i;
268 ret = -E_MP4FF_META_READ;
269 if (!mp4ff_meta_get_by_index(mp4ff, i, &tag->item, &tag->value))
271 PARA_INFO_LOG("found: %s: %s\n", tag->item, tag->value);
272 if (!strcmp(tag->item, "artist"))
273 replace_tag(tag, tags->artist, &found_artist);
274 else if (!strcmp(tag->item, "title"))
275 replace_tag(tag, tags->title, &found_title);
276 else if (!strcmp(tag->item, "album"))
277 replace_tag(tag, tags->album, &found_album);
278 else if (!strcmp(tag->item, "date"))
279 replace_tag(tag, tags->year, &found_year);
280 else if (!strcmp(tag->item, "comment"))
281 replace_tag(tag, tags->comment, &found_comment);
284 add_tag(&metadata, "artist", tags->artist);
286 add_tag(&metadata, "title", tags->title);
288 add_tag(&metadata, "album", tags->album);
290 add_tag(&metadata, "date", tags->year);
292 add_tag(&metadata, "comment", tags->comment);
293 ret = -E_MP4FF_META_WRITE;
294 if (!mp4ff_meta_update(&cb, &metadata))
299 free(metadata.tags[i - 1].item);
300 free(metadata.tags[i - 1].value);
308 static const char * const aac_suffixes[] = {"m4a", "mp4", NULL};
311 * The audio format handler for the Advanced Audio Codec.
313 * This is only compiled in if the faad library is installed.
315 const struct audio_format_handler aac_afh = {
316 .get_file_info = aac_get_file_info,
317 .suffixes = aac_suffixes,
318 .rewrite_tags = aac_afh_rewrite_tags,
319 .open = aac_afh_open,
320 .get_chunk = aac_afh_get_chunk,
321 .close = aac_afh_close,