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. */
14 /* To get the mp4ff_tag_t and mp4ff_metadata_t typedefs. */
19 #include "portable_io.h"
25 struct aac_afh_context {
31 mp4AudioSpecificConfig masc;
35 static uint32_t aac_afh_read_cb(void *user_data, void *dest, uint32_t want)
37 struct aac_afh_context *c = user_data;
40 if (want == 0 || c->fpos >= c->mapsize)
42 have = c->mapsize - c->fpos;
43 rv = PARA_MIN(have, want);
44 PARA_DEBUG_LOG("reading %u bytes @%zu\n", rv, c->fpos);
45 memcpy(dest, c->map + c->fpos, rv);
50 static uint32_t aac_afh_seek_cb(void *user_data, uint64_t pos)
52 struct aac_afh_context *c = user_data;
57 static int32_t aac_afh_get_track(mp4ff_t *mp4ff, mp4AudioSpecificConfig *masc)
59 int32_t i, rc, num_tracks = mp4ff_total_tracks(mp4ff);
61 assert(num_tracks >= 0);
62 for (i = 0; i < num_tracks; i++) {
63 unsigned char *buf = NULL;
64 unsigned buf_size = 0;
66 mp4ff_get_decoder_config(mp4ff, i, &buf, &buf_size);
68 rc = NeAACDecAudioSpecificConfig(buf, buf_size, masc);
75 return -1; /* no audio track */
78 static int aac_afh_open(const void *map, size_t mapsize, void **afh_context)
81 struct aac_afh_context *c = para_malloc(sizeof(*c));
86 c->cb.read = aac_afh_read_cb;
87 c->cb.seek = aac_afh_seek_cb;
91 c->mp4ff = mp4ff_open_read(&c->cb);
94 c->track = aac_afh_get_track(c->mp4ff, &c->masc);
101 mp4ff_close(c->mp4ff);
108 static void aac_afh_close(void *afh_context)
110 struct aac_afh_context *c = afh_context;
111 mp4ff_close(c->mp4ff);
116 * Libmp4ff function to reposition the file to the given sample.
118 * \param f The opaque handle returned by mp4ff_open_read().
119 * \param track The number of the (audio) track.
120 * \param sample Destination.
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.
125 * \return This function always returns 0.
127 int32_t mp4ff_set_sample_position(mp4ff_t *f, const int32_t track, const int32_t sample);
129 static int aac_afh_get_chunk(long unsigned chunk_num, void *afh_context,
130 const char **buf, size_t *len)
132 struct aac_afh_context *c = afh_context;
136 assert(chunk_num <= INT_MAX);
137 /* this function always returns zero */
138 mp4ff_set_sample_position(c->mp4ff, c->track, chunk_num);
140 ss = mp4ff_read_sample_getsize(c->mp4ff, c->track, chunk_num);
142 return -E_MP4FF_BAD_SAMPLE;
143 assert(ss + offset <= c->mapsize);
144 *buf = c->map + offset;
149 static void _aac_afh_get_taginfo(const mp4ff_t *mp4ff, struct taginfo *tags)
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);
159 * Init m4a file and write some tech data to given pointers.
161 static int aac_get_file_info(char *map, size_t numbytes, __a_unused int fd,
162 struct afh_info *afhi)
166 struct aac_afh_context *c;
172 ret = aac_afh_open(map, numbytes, (void **)&c);
176 ret = -E_MP4FF_BAD_SAMPLERATE;
177 rv = mp4ff_get_sample_rate(c->mp4ff, c->track);
180 afhi->frequency = rv;
182 ret = -E_MP4FF_BAD_CHANNEL_COUNT;
183 rv = mp4ff_get_channel_count(c->mp4ff, c->track);
188 ret = -E_MP4FF_BAD_SAMPLE_COUNT;
189 rv = mp4ff_num_samples(c->mp4ff, c->track);
192 afhi->chunks_total = rv;
193 afhi->max_chunk_size = 0;
194 for (n = 0; n < afhi->chunks_total; n++) {
195 if (aac_afh_get_chunk(n, c, &buf, &sz) < 0)
197 afhi->max_chunk_size = PARA_MAX((size_t)afhi->max_chunk_size, sz);
200 tmp = c->masc.sbr_present_flag == 1? 2048 : 1024;
201 afhi->seconds_total = tmp * afhi->chunks_total / afhi->frequency;
202 ms2tv(1000 * tmp / afhi->frequency, &afhi->chunk_tv);
204 if (aac_afh_get_chunk(0, c, &buf, &sz) >= 0)
205 numbytes -= buf - map;
206 afhi->bitrate = 8 * numbytes / afhi->seconds_total / 1000;
207 _aac_afh_get_taginfo(c->mp4ff, &afhi->tags);
214 static uint32_t aac_afh_meta_read_cb(void *user_data, void *dest, uint32_t want)
216 int fd = *(int *)user_data;
217 return read(fd, dest, want);
220 static uint32_t aac_afh_meta_seek_cb(void *user_data, uint64_t pos)
222 int fd = *(int *)user_data;
223 return lseek(fd, pos, SEEK_SET);
226 static uint32_t aac_afh_meta_write_cb(void *user_data, void *dest, uint32_t want)
228 int fd = *(int *)user_data;
229 return write(fd, dest, want);
232 static uint32_t aac_afh_meta_truncate_cb(void *user_data)
234 int fd = *(int *)user_data;
235 off_t offset = lseek(fd, 0, SEEK_CUR);
236 return ftruncate(fd, offset);
239 static void replace_tag(mp4ff_tag_t *tag, const char *new_val, bool *found)
242 tag->value = para_strdup(new_val);
246 static void add_tag(mp4ff_metadata_t *md, const char *item, const char *value)
248 md->tags[md->count].item = para_strdup(item);
249 md->tags[md->count].value = para_strdup(value);
253 static int aac_afh_rewrite_tags(const char *map, size_t mapsize,
254 struct taginfo *tags, int fd, __a_unused const char *filename)
258 mp4ff_metadata_t metadata;
260 mp4ff_callback_t cb = {
261 .read = aac_afh_meta_read_cb,
262 .seek = aac_afh_meta_seek_cb,
263 .write = aac_afh_meta_write_cb,
264 .truncate = aac_afh_meta_truncate_cb,
267 bool found_artist = false, found_title = false, found_album = false,
268 found_year = false, found_comment = false;
270 ret = write_all(fd, map, mapsize);
273 lseek(fd, 0, SEEK_SET);
275 mp4ff = mp4ff_open_read_metaonly(&cb);
277 return -E_MP4FF_OPEN;
279 ret = -E_MP4FF_META_READ;
280 rv = mp4ff_meta_get_num_items(mp4ff);
284 PARA_NOTICE_LOG("%d metadata item(s) found\n", rv);
286 metadata.tags = para_malloc((metadata.count + 5) * sizeof(mp4ff_tag_t));
287 for (i = 0; i < metadata.count; i++) {
288 mp4ff_tag_t *tag = metadata.tags + i;
290 ret = -E_MP4FF_META_READ;
291 if (!mp4ff_meta_get_by_index(mp4ff, i, &tag->item, &tag->value))
293 PARA_INFO_LOG("found: %s: %s\n", tag->item, tag->value);
294 if (!strcmp(tag->item, "artist"))
295 replace_tag(tag, tags->artist, &found_artist);
296 else if (!strcmp(tag->item, "title"))
297 replace_tag(tag, tags->title, &found_title);
298 else if (!strcmp(tag->item, "album"))
299 replace_tag(tag, tags->album, &found_album);
300 else if (!strcmp(tag->item, "date"))
301 replace_tag(tag, tags->year, &found_year);
302 else if (!strcmp(tag->item, "comment"))
303 replace_tag(tag, tags->comment, &found_comment);
306 add_tag(&metadata, "artist", tags->artist);
308 add_tag(&metadata, "title", tags->title);
310 add_tag(&metadata, "album", tags->album);
312 add_tag(&metadata, "date", tags->year);
314 add_tag(&metadata, "comment", tags->comment);
315 ret = -E_MP4FF_META_WRITE;
316 if (!mp4ff_meta_update(&cb, &metadata))
321 free(metadata.tags[i - 1].item);
322 free(metadata.tags[i - 1].value);
330 static const char * const aac_suffixes[] = {"m4a", "mp4", NULL};
333 * The audio format handler for the Advanced Audio Codec.
335 * This is only compiled in if the faad library is installed.
337 const struct audio_format_handler aac_afh = {
338 .get_file_info = aac_get_file_info,
339 .suffixes = aac_suffixes,
340 .rewrite_tags = aac_afh_rewrite_tags,
341 .open = aac_afh_open,
342 .get_chunk = aac_afh_get_chunk,
343 .close = aac_afh_close,