2 * Copyright (C) 2003-2005 M. Bakker, Nero AG, http://www.nero.com
3 * FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
11 #include "portable_io.h"
17 uint16_t channelCount;
21 uint32_t stsz_sample_size;
22 uint32_t stsz_sample_count;
26 uint32_t stts_entry_count;
27 uint32_t *stts_sample_count;
28 uint32_t *stts_sample_delta;
31 uint32_t stsc_entry_count;
32 uint32_t *stsc_first_chunk;
33 uint32_t *stsc_samples_per_chunk;
34 uint32_t *stsc_sample_desc_index;
37 uint32_t stco_entry_count;
38 uint32_t *stco_chunk_offset;
44 #define MAX_TRACKS 1024
47 const struct mp4_callback *cb;
48 int64_t current_position;
55 /* incremental track index while reading the file */
58 struct mp4_track *track[MAX_TRACKS];
61 struct mp4_metadata meta;
64 int32_t mp4_total_tracks(const struct mp4 *f)
66 return f->total_tracks;
70 * Returns -1, 0, or 1 on errors/EOF/success. Partial reads followed by EOF or
71 * read errors are treated as errors.
73 static int read_data(struct mp4 *f, void *data, size_t size)
76 ssize_t ret = f->cb->read(f->cb->user_data, data, size);
77 if (ret < 0 && errno == EINTR)
79 /* regard EAGAIN as an error as reads should be blocking. */
81 return ret < 0? -1 : 0;
82 f->current_position += ret;
88 static int read_int64(struct mp4 *f, uint64_t *result)
91 int ret = read_data(f, data, 8);
93 if (ret > 0 && result)
94 *result = read_u64_be(data);
98 static int read_int32(struct mp4 *f, uint32_t *result)
101 int ret = read_data(f, data, 4);
103 if (ret > 0 && result)
104 *result = read_u32_be(data);
108 static int read_int24(struct mp4 *f, uint32_t *result)
111 int ret = read_data(f, data, 3);
113 if (ret > 0 && result)
114 *result = read_u24_be(data);
118 static int read_int16(struct mp4 *f, uint16_t *result)
121 int ret = read_data(f, data, 2);
123 if (ret > 0 && result)
124 *result = read_u16_be(data);
128 static uint8_t read_int8(struct mp4 *f, uint8_t *result)
131 int ret = read_data(f, data, 1);
133 if (ret > 0 && result)
138 static bool atom_compare(int8_t a1, int8_t b1, int8_t c1, int8_t d1,
139 int8_t a2, int8_t b2, int8_t c2, int8_t d2)
141 return a1 == a2 && b1 == b2 && c1 == c2 && d1 == d2;
145 /* atoms with subatoms */
153 ATOM_ILST = 8, /* iTunes Metadata list */
164 ATOM_COMPILATION = 19,
174 /* atoms without subatoms */
180 ATOM_MDHD = 134, /* track header */
184 ATOM_STSD = 138, /* sample description box */
185 ATOM_STTS = 139, /* time to sample box */
186 ATOM_STSZ = 140, /* sample size box */
188 ATOM_STCO = 142, /* chunk offset box */
189 ATOM_STSC = 143, /* sample to chunk box */
194 ATOM_META = 148, /* iTunes Metadata box */
195 ATOM_NAME = 149, /* iTunes Metadata name box */
196 ATOM_DATA = 150, /* iTunes Metadata data box */
203 ATOM_ALBUM_ARTIST = 157,
204 ATOM_CONTENTGROUP = 158,
206 ATOM_DESCRIPTION = 160,
209 ATOM_EPISODENAME = 163,
210 ATOM_SORTTITLE = 164,
211 ATOM_SORTALBUM = 165,
212 ATOM_SORTARTIST = 166,
213 ATOM_SORTALBUMARTIST = 167,
214 ATOM_SORTWRITER = 168,
223 #define ATOM_FREE ATOM_UNKNOWN
224 #define ATOM_SKIP ATOM_UNKNOWN
226 #define COPYRIGHT_SYMBOL ((int8_t)0xA9)
228 static uint8_t atom_name_to_type(int8_t a, int8_t b, int8_t c, int8_t d)
231 if (atom_compare(a, b, c, d, 'm', 'o', 'o', 'v'))
233 else if (atom_compare(a, b, c, d, 'm', 'i', 'n', 'f'))
235 else if (atom_compare(a, b, c, d, 'm', 'd', 'i', 'a'))
237 else if (atom_compare(a, b, c, d, 'm', 'd', 'a', 't'))
239 else if (atom_compare(a, b, c, d, 'm', 'd', 'h', 'd'))
241 else if (atom_compare(a, b, c, d, 'm', 'v', 'h', 'd'))
243 else if (atom_compare(a, b, c, d, 'm', 'p', '4', 'a'))
245 else if (atom_compare(a, b, c, d, 'm', 'p', '4', 'v'))
247 else if (atom_compare(a, b, c, d, 'm', 'p', '4', 's'))
249 else if (atom_compare(a, b, c, d, 'm', 'e', 't', 'a'))
251 } else if (a == 't') {
252 if (atom_compare(a, b, c, d, 't', 'r', 'a', 'k'))
254 else if (atom_compare(a, b, c, d, 't', 'k', 'h', 'd'))
256 else if (atom_compare(a, b, c, d, 't', 'r', 'e', 'f'))
258 else if (atom_compare(a, b, c, d, 't', 'r', 'k', 'n'))
260 else if (atom_compare(a, b, c, d, 't', 'm', 'p', 'o'))
262 else if (atom_compare(a, b, c, d, 't', 'v', 'n', 'n'))
264 else if (atom_compare(a, b, c, d, 't', 'v', 's', 'h'))
266 else if (atom_compare(a, b, c, d, 't', 'v', 'e', 'n'))
267 return ATOM_EPISODENAME;
268 else if (atom_compare(a, b, c, d, 't', 'v', 's', 'n'))
270 else if (atom_compare(a, b, c, d, 't', 'v', 'e', 's'))
272 } else if (a == 's') {
273 if (atom_compare(a, b, c, d, 's', 't', 'b', 'l'))
275 else if (atom_compare(a, b, c, d, 's', 'm', 'h', 'd'))
277 else if (atom_compare(a, b, c, d, 's', 't', 's', 'd'))
279 else if (atom_compare(a, b, c, d, 's', 't', 't', 's'))
281 else if (atom_compare(a, b, c, d, 's', 't', 'c', 'o'))
283 else if (atom_compare(a, b, c, d, 's', 't', 's', 'c'))
285 else if (atom_compare(a, b, c, d, 's', 't', 's', 'z'))
287 else if (atom_compare(a, b, c, d, 's', 't', 'z', '2'))
289 else if (atom_compare(a, b, c, d, 's', 'k', 'i', 'p'))
291 else if (atom_compare(a, b, c, d, 's', 'i', 'n', 'f'))
293 else if (atom_compare(a, b, c, d, 's', 'c', 'h', 'i'))
295 else if (atom_compare(a, b, c, d, 's', 'o', 'n', 'm'))
296 return ATOM_SORTTITLE;
297 else if (atom_compare(a, b, c, d, 's', 'o', 'a', 'l'))
298 return ATOM_SORTALBUM;
299 else if (atom_compare(a, b, c, d, 's', 'o', 'a', 'r'))
300 return ATOM_SORTARTIST;
301 else if (atom_compare(a, b, c, d, 's', 'o', 'a', 'a'))
302 return ATOM_SORTALBUMARTIST;
303 else if (atom_compare(a, b, c, d, 's', 'o', 'c', 'o'))
304 return ATOM_SORTWRITER;
305 else if (atom_compare(a, b, c, d, 's', 'o', 's', 'n'))
306 return ATOM_SORTSHOW;
307 } else if (a == COPYRIGHT_SYMBOL) {
308 if (atom_compare(a, b, c, d, COPYRIGHT_SYMBOL, 'n', 'a', 'm'))
310 else if (atom_compare(a, b, c, d, COPYRIGHT_SYMBOL, 'A', 'R', 'T'))
312 else if (atom_compare(a, b, c, d, COPYRIGHT_SYMBOL, 'w', 'r', 't'))
314 else if (atom_compare(a, b, c, d, COPYRIGHT_SYMBOL, 'a', 'l', 'b'))
316 else if (atom_compare(a, b, c, d, COPYRIGHT_SYMBOL, 'd', 'a', 'y'))
318 else if (atom_compare(a, b, c, d, COPYRIGHT_SYMBOL, 't', 'o', 'o'))
320 else if (atom_compare(a, b, c, d, COPYRIGHT_SYMBOL, 'c', 'm', 't'))
322 else if (atom_compare(a, b, c, d, COPYRIGHT_SYMBOL, 'g', 'e', 'n'))
324 else if (atom_compare(a, b, c, d, COPYRIGHT_SYMBOL, 'g', 'r', 'p'))
325 return ATOM_CONTENTGROUP;
326 else if (atom_compare(a, b, c, d, COPYRIGHT_SYMBOL, 'l', 'y', 'r'))
330 if (atom_compare(a, b, c, d, 'e', 'd', 't', 's'))
332 else if (atom_compare(a, b, c, d, 'e', 's', 'd', 's'))
334 else if (atom_compare(a, b, c, d, 'f', 't', 'y', 'p'))
336 else if (atom_compare(a, b, c, d, 'f', 'r', 'e', 'e'))
338 else if (atom_compare(a, b, c, d, 'h', 'm', 'h', 'd'))
340 else if (atom_compare(a, b, c, d, 'v', 'm', 'h', 'd'))
342 else if (atom_compare(a, b, c, d, 'u', 'd', 't', 'a'))
344 else if (atom_compare(a, b, c, d, 'i', 'l', 's', 't'))
346 else if (atom_compare(a, b, c, d, 'n', 'a', 'm', 'e'))
348 else if (atom_compare(a, b, c, d, 'd', 'a', 't', 'a'))
350 else if (atom_compare(a, b, c, d, 'd', 'i', 's', 'k'))
352 else if (atom_compare(a, b, c, d, 'g', 'n', 'r', 'e'))
354 else if (atom_compare(a, b, c, d, 'c', 'o', 'v', 'r'))
356 else if (atom_compare(a, b, c, d, 'c', 'p', 'i', 'l'))
357 return ATOM_COMPILATION;
358 else if (atom_compare(a, b, c, d, 'c', 't', 't', 's'))
360 else if (atom_compare(a, b, c, d, 'd', 'r', 'm', 's'))
362 else if (atom_compare(a, b, c, d, 'f', 'r', 'm', 'a'))
364 else if (atom_compare(a, b, c, d, 'p', 'r', 'i', 'v'))
366 else if (atom_compare(a, b, c, d, 'i', 'v', 'i', 'v'))
368 else if (atom_compare(a, b, c, d, 'u', 's', 'e', 'r'))
370 else if (atom_compare(a, b, c, d, 'k', 'e', 'y', ' '))
372 else if (atom_compare(a, b, c, d, 'a', 'A', 'R', 'T'))
373 return ATOM_ALBUM_ARTIST;
374 else if (atom_compare(a, b, c, d, 'd', 'e', 's', 'c'))
375 return ATOM_DESCRIPTION;
376 else if (atom_compare(a, b, c, d, 'p', 'c', 's', 't'))
382 /* read atom header, atom size is returned with header included. */
383 static int atom_read_header(struct mp4 *f, uint8_t *atom_type,
384 uint8_t *header_size, uint64_t *atom_size)
388 int8_t atom_header[8];
390 ret = read_data(f, atom_header, 8);
393 size = read_u32_be(atom_header);
394 if (size == 1) { /* 64 bit atom size */
397 ret = read_int64(f, atom_size);
406 *atom_type = atom_name_to_type(atom_header[4], atom_header[5],
407 atom_header[6], atom_header[7]);
411 static int64_t get_position(const struct mp4 *f)
413 return f->current_position;
416 static int need_parse_when_meta_only(uint8_t atom_type)
437 static int32_t set_position(struct mp4 *f, int64_t position)
439 f->cb->seek(f->cb->user_data, position);
440 f->current_position = position;
445 static int read_stsz(struct mp4 *f)
451 if (f->total_tracks == 0)
453 t = f->track[f->total_tracks - 1];
454 ret = read_int8(f, NULL); /* version */
457 ret = read_int24(f, NULL); /* flags */
460 ret = read_int32(f, &t->stsz_sample_size);
463 ret = read_int32(f, &t->stsz_sample_count);
466 if (t->stsz_sample_size != 0)
468 t->stsz_table = para_malloc(t->stsz_sample_count * sizeof(int32_t));
469 for (i = 0; i < t->stsz_sample_count; i++) {
470 ret = read_int32(f, &t->stsz_table[i]);
477 static int read_stts(struct mp4 *f)
483 if (f->total_tracks == 0)
485 t = f->track[f->total_tracks - 1];
486 if (t->stts_entry_count)
488 ret = read_int8(f, NULL); /* version */
491 ret = read_int24(f, NULL); /* flags */
494 ret = read_int32(f, &t->stts_entry_count);
497 t->stts_sample_count = para_malloc(t->stts_entry_count
499 t->stts_sample_delta = para_malloc(t->stts_entry_count
501 for (i = 0; i < t->stts_entry_count; i++) {
502 ret = read_int32(f, &t->stts_sample_count[i]);
505 ret = read_int32(f, &t->stts_sample_delta[i]);
512 static int read_stsc(struct mp4 *f)
518 if (f->total_tracks == 0)
520 t = f->track[f->total_tracks - 1];
522 ret = read_int8(f, NULL); /* version */
525 ret = read_int24(f, NULL); /* flags */
528 ret = read_int32(f, &t->stsc_entry_count);
531 t->stsc_first_chunk = para_malloc(t->stsc_entry_count * sizeof(int32_t));
532 t->stsc_samples_per_chunk = para_malloc(t->stsc_entry_count
534 t->stsc_sample_desc_index = para_malloc(t->stsc_entry_count *
537 for (i = 0; i < t->stsc_entry_count; i++) {
538 ret = read_int32(f, &t->stsc_first_chunk[i]);
541 ret = read_int32(f, &t->stsc_samples_per_chunk[i]);
544 ret = read_int32(f, &t->stsc_sample_desc_index[i]);
551 static int read_stco(struct mp4 *f)
557 if (f->total_tracks == 0)
559 t = f->track[f->total_tracks - 1];
561 ret = read_int8(f, NULL); /* version */
564 ret = read_int24(f, NULL); /* flags */
567 ret = read_int32(f, &t->stco_entry_count);
570 t->stco_chunk_offset = para_malloc(t->stco_entry_count
572 for (i = 0; i < t->stco_entry_count; i++) {
573 ret = read_int32(f, &t->stco_chunk_offset[i]);
580 static int read_mp4a(struct mp4 *f)
584 uint8_t atom_type = 0;
585 uint8_t header_size = 0;
588 if (f->total_tracks == 0)
590 t = f->track[f->total_tracks - 1];
592 for (i = 0; i < 6; i++) {
593 ret = read_int8(f, NULL); /* reserved */
597 ret = read_int16(f, NULL); /* data_reference_index */
600 ret = read_int32(f, NULL); /* reserved */
603 ret = read_int32(f, NULL); /* reserved */
606 ret = read_int16(f, &t->channelCount);
609 ret = read_int16(f, NULL);
612 ret = read_int16(f, NULL);
615 ret = read_int16(f, NULL);
618 ret = read_int16(f, &t->sampleRate);
621 ret = read_int16(f, NULL);
624 return atom_read_header(f, &atom_type, &header_size, NULL);
627 static int read_stsd(struct mp4 *f)
630 uint32_t i, entry_count;
631 uint8_t header_size = 0;
634 if (f->total_tracks == 0)
636 t = f->track[f->total_tracks - 1];
637 ret = read_int8(f, NULL); /* version */
640 ret = read_int24(f, NULL); /* flags */
643 ret = read_int32(f, &entry_count);
646 for (i = 0; i < entry_count; i++) {
647 uint64_t skip = get_position(f);
649 uint8_t atom_type = 0;
650 ret = atom_read_header(f, &atom_type, &header_size, &size);
654 t->is_audio = atom_type == ATOM_MP4A;
657 set_position(f, skip);
662 static int32_t tag_add_field(struct mp4_metadata *meta, const char *item,
663 const char *value, int32_t len)
665 meta->tags = para_realloc(meta->tags,
666 (meta->count + 1) * sizeof(struct mp4_tag));
667 meta->tags[meta->count].item = para_strdup(item);
668 meta->tags[meta->count].len = len;
670 meta->tags[meta->count].value = para_malloc(len + 1);
671 memcpy(meta->tags[meta->count].value, value, len);
672 meta->tags[meta->count].value[len] = 0;
674 meta->tags[meta->count].value = para_strdup(value);
680 static int read_string(struct mp4 *f, uint32_t length, char **result)
682 char *str = para_malloc(length + 1);
683 int ret = read_data(f, str, length);
695 static const char *get_metadata_name(uint8_t atom_type)
698 case ATOM_TITLE: return "title";
699 case ATOM_ARTIST: return "artist";
700 case ATOM_ALBUM: return "album";
701 case ATOM_DATE: return "date";
702 case ATOM_COMMENT: return "comment";
703 default: return "unknown";
707 static int parse_tag(struct mp4 *f, uint8_t parent, int32_t size)
710 uint64_t subsize, sumsize;
718 set_position(f, destpos), sumsize += subsize
721 uint8_t header_size = 0;
722 ret = atom_read_header(f, &atom_type, &header_size, &subsize);
725 destpos = get_position(f) + subsize - header_size;
726 if (atom_type != ATOM_DATA)
728 ret = read_int8(f, NULL); /* version */
731 ret = read_int24(f, NULL); /* flags */
734 ret = read_int32(f, NULL); /* reserved */
738 ret = read_string(f, subsize - (header_size + 8), &data);
741 len = subsize - (header_size + 8);
745 tag_add_field(&f->meta, get_metadata_name(parent), data, len);
750 static int read_mdhd(struct mp4 *f)
756 if (f->total_tracks == 0)
758 t = f->track[f->total_tracks - 1];
760 ret = read_int32(f, &version);
764 ret = read_int64(f, NULL); /* creation-time */
767 ret = read_int64(f, NULL); /* modification-time */
770 ret = read_int32(f, &t->timeScale);
773 ret = read_int64(f, &t->duration);
776 } else { //version == 0
779 ret = read_int32(f, NULL); /* creation-time */
782 ret = read_int32(f, NULL); /* modification-time */
785 ret = read_int32(f, &t->timeScale);
788 ret = read_int32(f, &temp);
791 t->duration = (temp == (uint32_t) (-1))?
792 (uint64_t) (-1) : (uint64_t) (temp);
794 ret = read_int16(f, NULL);
797 ret = read_int16(f, NULL);
803 static int32_t read_ilst(struct mp4 *f, int32_t size)
806 uint64_t sumsize = 0;
808 while (sumsize < size) {
810 uint64_t subsize, destpos;
811 uint8_t header_size = 0;
812 ret = atom_read_header(f, &atom_type, &header_size, &subsize);
815 destpos = get_position(f) + subsize - header_size;
822 parse_tag(f, atom_type, subsize - header_size);
824 set_position(f, destpos);
830 static int32_t read_meta(struct mp4 *f, uint64_t size)
833 uint64_t subsize, sumsize = 0;
835 uint8_t header_size = 0;
837 ret = read_int8(f, NULL); /* version */
840 ret = read_int24(f, NULL); /* flags */
843 while (sumsize < (size - (header_size + 4))) {
844 ret = atom_read_header(f, &atom_type, &header_size, &subsize);
847 if (subsize <= header_size + 4)
849 if (atom_type == ATOM_ILST)
850 read_ilst(f, subsize - (header_size + 4));
852 set_position(f, get_position(f) + subsize - header_size);
858 static int atom_read(struct mp4 *f, uint64_t size, uint8_t atom_type)
860 uint64_t dest_position = get_position(f) + size - 8;
861 int ret = 1; /* return success for atoms we don't care about */
864 case ATOM_STSZ: ret = read_stsz(f); break;
865 case ATOM_STTS: ret = read_stts(f); break;
866 case ATOM_STSC: ret = read_stsc(f); break;
867 case ATOM_STCO: ret = read_stco(f); break;
868 case ATOM_STSD: ret = read_stsd(f); break;
869 case ATOM_MDHD: ret = read_mdhd(f); break;
870 case ATOM_META: ret = read_meta(f, size); break;
872 set_position(f, dest_position);
876 /* parse atoms that are sub atoms of other atoms */
877 static int parse_sub_atoms(struct mp4 *f, uint64_t total_size, int meta_only)
881 uint8_t atom_type = 0;
882 uint64_t counted_size = 0;
883 uint8_t header_size = 0;
885 while (counted_size < total_size) {
886 ret = atom_read_header(f, &atom_type, &header_size, &size);
891 counted_size += size;
892 if (atom_type == ATOM_TRAK) {
893 if (f->total_tracks >= MAX_TRACKS)
896 f->track[f->total_tracks - 1] = para_calloc(
897 sizeof(struct mp4_track));
900 if (meta_only && !need_parse_when_meta_only(atom_type)) {
901 set_position(f, get_position(f) + size - header_size);
902 } else if (atom_type < SUBATOMIC) {
903 ret = parse_sub_atoms(f, size - header_size, meta_only);
907 ret = atom_read(f, size, atom_type);
915 /* parse root atoms */
916 static int parse_atoms(struct mp4 *f, int meta_only)
920 uint8_t atom_type = 0;
921 uint8_t header_size = 0;
925 while ((ret = atom_read_header(f, &atom_type, &header_size, &size)) > 0) {
926 f->file_size += size;
927 f->last_atom = atom_type;
929 if (atom_type == ATOM_MOOV && size > header_size) {
930 f->moov_offset = get_position(f) - header_size;
935 if (meta_only && !need_parse_when_meta_only(atom_type)) {
936 set_position(f, get_position(f) + size - header_size);
937 } else if (atom_type < SUBATOMIC) {
938 ret = parse_sub_atoms(f, size - header_size, meta_only);
943 set_position(f, get_position(f) + size - header_size);
949 struct mp4 *mp4_open_read(const struct mp4_callback *cb)
952 struct mp4 *f = para_calloc(sizeof(struct mp4));
955 ret = parse_atoms(f, 0);
963 void mp4_close(struct mp4 *f)
967 for (i = 0; i < f->total_tracks; i++) {
969 free(f->track[i]->stsz_table);
970 free(f->track[i]->stts_sample_count);
971 free(f->track[i]->stts_sample_delta);
972 free(f->track[i]->stsc_first_chunk);
973 free(f->track[i]->stsc_samples_per_chunk);
974 free(f->track[i]->stsc_sample_desc_index);
975 free(f->track[i]->stco_chunk_offset);
979 for (i = 0; i < f->meta.count; i++) {
980 free(f->meta.tags[i].item);
981 free(f->meta.tags[i].value);
987 static int32_t chunk_of_sample(const struct mp4 *f, int32_t track,
988 int32_t sample, int32_t *chunk_sample, int32_t *chunk)
990 int32_t total_entries = 0;
992 int32_t chunk1, chunk2, chunk1samples, range_samples, total = 0;
996 if (f->track[track] == NULL) {
1000 total_entries = f->track[track]->stsc_entry_count;
1007 chunk2 = f->track[track]->stsc_first_chunk[chunk2entry];
1008 *chunk = chunk2 - chunk1;
1009 range_samples = *chunk * chunk1samples;
1011 if (sample < total + range_samples)
1014 chunk1samples = f->track[track]->stsc_samples_per_chunk[chunk2entry];
1017 if (chunk2entry < total_entries) {
1019 total += range_samples;
1021 } while (chunk2entry < total_entries);
1024 *chunk = (sample - total) / chunk1samples + chunk1;
1028 *chunk_sample = total + (*chunk - chunk1) * chunk1samples;
1033 static int32_t chunk_to_offset(const struct mp4 *f, int32_t track,
1036 const struct mp4_track *p_track = f->track[track];
1038 if (p_track->stco_entry_count && (chunk > p_track->stco_entry_count)) {
1039 return p_track->stco_chunk_offset[p_track->stco_entry_count -
1041 } else if (p_track->stco_entry_count) {
1042 return p_track->stco_chunk_offset[chunk - 1];
1050 static int32_t sample_range_size(const struct mp4 *f, int32_t track,
1051 int32_t chunk_sample, int32_t sample)
1054 const struct mp4_track *p_track = f->track[track];
1056 if (p_track->stsz_sample_size) {
1057 return (sample - chunk_sample) * p_track->stsz_sample_size;
1059 if (sample >= p_track->stsz_sample_count)
1062 for (i = chunk_sample, total = 0; i < sample; i++) {
1063 total += p_track->stsz_table[i];
1070 static int32_t sample_to_offset(const struct mp4 *f, int32_t track,
1073 int32_t chunk, chunk_sample, chunk_offset1, chunk_offset2;
1075 chunk_of_sample(f, track, sample, &chunk_sample, &chunk);
1077 chunk_offset1 = chunk_to_offset(f, track, chunk);
1078 chunk_offset2 = chunk_offset1 + sample_range_size(f,
1079 track, chunk_sample, sample);
1080 return chunk_offset2;
1084 * Return the number of milliseconds of the given track.
1086 * \param f As returned by \ref mp4_open_read(), must not be NULL.
1087 * \param track Between zero and the value returned by \ref mp4_total_tracks().
1089 * The function returns zero if the audio file is of zero length or contains a
1090 * corrupt track header.
1092 uint64_t mp4_get_duration(const struct mp4 *f, int32_t track)
1094 const struct mp4_track *t = f->track[track];
1096 if (t->timeScale == 0)
1098 return t->duration * 1000 / t->timeScale;
1102 * Check whether the given track number corresponds to an audio track.
1104 * \param f See \ref mp4_get_duration().
1105 * \param track See \ref mp4_get_duration().
1107 * Besides audio tracks, an mp4 file may contain video and system tracks. For
1108 * those the function returns false.
1110 bool mp4_is_audio_track(const struct mp4 *f, int32_t track)
1112 return f->track[track]->is_audio;
1115 void mp4_set_sample_position(struct mp4 *f, int32_t track, int32_t sample)
1117 int32_t offset = sample_to_offset(f, track, sample);
1118 set_position(f, offset);
1121 int32_t mp4_get_sample_size(const struct mp4 *f, int track, int sample)
1123 const struct mp4_track *t = f->track[track];
1125 if (t->stsz_sample_size != 0)
1126 return t->stsz_sample_size;
1127 return t->stsz_table[sample];
1130 uint32_t mp4_get_sample_rate(const struct mp4 *f, int32_t track)
1132 return f->track[track]->sampleRate;
1135 uint32_t mp4_get_channel_count(const struct mp4 *f, int32_t track)
1137 return f->track[track]->channelCount;
1140 int32_t mp4_num_samples(const struct mp4 *f, int32_t track)
1145 for (i = 0; i < f->track[track]->stts_entry_count; i++) {
1146 total += f->track[track]->stts_sample_count[i];
1151 struct mp4 *mp4_open_meta(const struct mp4_callback *cb)
1154 struct mp4 *f = para_calloc(sizeof(struct mp4));
1157 ret = parse_atoms(f, 1);
1166 * Return the metadata of an mp4 file.
1168 * \param f As returned by either \ref mp4_open_read() or \ref mp4_open_meta().
1170 * The caller is allowed to add, delete or modify the entries of the returned
1171 * structure in order to pass the modified version to \ref mp4_meta_update().
1173 struct mp4_metadata *mp4_get_meta(struct mp4 *f)
1178 static int find_atom(struct mp4 *f, uint64_t base, uint32_t size,
1181 uint32_t remaining = size;
1182 uint64_t atom_offset = base;
1189 set_position(f, atom_offset);
1193 ret = read_int32(f, &atom_size);
1196 if (atom_size > remaining || atom_size < 8)
1198 ret = read_data(f, atom_name, 4);
1201 if (!memcmp(atom_name, name, 4)) {
1202 set_position(f, atom_offset);
1205 remaining -= atom_size;
1206 atom_offset += atom_size;
1211 * Try to find atom <name> with atom <name_inside> in it. Besides -1/0/1 for
1212 * error, EOF and success, this function may return 2 to indicate that the
1213 * desired atoms were not found.
1215 static int find_atom_v2(struct mp4 *f, uint64_t base, uint32_t size,
1216 const char *name, uint32_t extraheaders, const char *name_inside)
1218 uint64_t first_base = (uint64_t) (-1);
1223 int ret = find_atom(f, base, size, name);
1227 mybase = get_position(f);
1228 ret = read_int32(f, &mysize);
1231 if (first_base == (uint64_t) (-1))
1232 first_base = mybase;
1234 if (mysize < 8 + extraheaders)
1237 if (find_atom (f, mybase + (8 + extraheaders),
1238 mysize - (8 + extraheaders), name_inside)) {
1239 set_position(f, mybase);
1247 if (first_base != (uint64_t)(-1)) {
1248 set_position(f, first_base);
1251 /* wanted atom inside not found */
1261 static struct membuffer *membuffer_create(void)
1263 struct membuffer *buf = para_calloc(sizeof(*buf));
1265 buf->allocated = 256;
1266 buf->data = para_malloc(buf->allocated);
1270 static void membuffer_write(struct membuffer *buf, const void *ptr,
1273 unsigned dest_size = buf->written + bytes;
1275 if (dest_size > buf->allocated) {
1277 buf->allocated <<= 1;
1278 } while (dest_size > buf->allocated);
1279 buf->data = para_realloc(buf->data, buf->allocated);
1283 memcpy((char *) buf->data + buf->written, ptr, bytes);
1284 buf->written += bytes;
1287 static void membuffer_write_atom_name(struct membuffer *buf, const char *data)
1289 membuffer_write(buf, data, 4);
1292 static void membuffer_write_int32(struct membuffer *buf, uint32_t data)
1295 write_u32_be(temp, data);
1296 membuffer_write(buf, temp, 4);
1299 static void membuffer_write_std_tag(struct membuffer *buf, const char *name,
1302 uint32_t len = strlen(value);
1303 membuffer_write_int32(buf, 8 /* atom header */
1304 + 8 /* data atom header */
1305 + 8 /* flags + reserved */
1307 membuffer_write_atom_name(buf, name);
1308 membuffer_write_int32(buf, 8 /* data atom header */
1309 + 8 /* flags + reserved */
1311 membuffer_write_atom_name(buf, "data");
1312 membuffer_write_int32(buf, 1); /* flags */
1313 membuffer_write_int32(buf, 0); /* reserved */
1314 membuffer_write(buf, value, len);
1317 static unsigned membuffer_get_size(const struct membuffer *buf)
1319 return buf->written;
1322 static void *membuffer_detach(struct membuffer *buf)
1324 void *ret = para_realloc(buf->data, buf->written);
1329 struct stdmeta_entry {
1334 static const char *find_standard_meta(const char *name)
1336 const struct stdmeta_entry stdmetas[] = {
1337 {"\xA9" "nam", "title"},
1338 {"\xA9" "ART", "artist"},
1339 {"\xA9" "alb", "album"},
1340 {"\xA9" "day", "date"},
1341 {"\xA9" "cmt", "comment"},
1344 for (unsigned n = 0; n < ARRAY_SIZE(stdmetas); n++)
1345 if (!strcasecmp(name, stdmetas[n].name))
1346 return stdmetas[n].atom;
1350 static uint32_t create_ilst(const struct mp4_metadata *meta, void **out_buffer,
1351 uint32_t * out_size)
1353 struct membuffer *buf = membuffer_create();
1356 for (metaptr = 0; metaptr < meta->count; metaptr++) {
1357 struct mp4_tag *tag = meta->tags + metaptr;
1358 const char *std_meta_atom = find_standard_meta(tag->item);
1360 membuffer_write_std_tag(buf, std_meta_atom, tag->value);
1362 PARA_ERROR_LOG("invalid tag item: %s\n", tag->item);
1364 *out_size = membuffer_get_size(buf);
1365 *out_buffer = membuffer_detach(buf);
1369 static void membuffer_write_atom(struct membuffer *buf, const char *name, unsigned size,
1372 membuffer_write_int32(buf, size + 8);
1373 membuffer_write_atom_name(buf, name);
1374 membuffer_write(buf, data, size);
1377 static void *membuffer_get_ptr(const struct membuffer *buf)
1382 static bool membuffer_transfer_from_file(struct membuffer *buf, struct mp4 *src,
1385 unsigned oldsize = membuffer_get_size(buf);
1388 membuffer_write(buf, 0, bytes);
1389 bufptr = membuffer_get_ptr(buf);
1390 if (read_data(src, bufptr + oldsize, bytes) != 1) {
1398 static uint32_t create_meta(const struct mp4_metadata *meta, void **out_buffer,
1399 uint32_t * out_size)
1401 struct membuffer *buf;
1405 if (!create_ilst(meta, &ilst_buffer, &ilst_size))
1408 buf = membuffer_create();
1410 membuffer_write_int32(buf, 0);
1411 membuffer_write_atom(buf, "ilst", ilst_size, ilst_buffer);
1414 *out_size = membuffer_get_size(buf);
1415 *out_buffer = membuffer_detach(buf);
1419 static uint32_t create_udta(const struct mp4_metadata *meta, void **out_buffer,
1420 uint32_t * out_size)
1422 struct membuffer *buf;
1426 if (!create_meta(meta, &meta_buffer, &meta_size))
1429 buf = membuffer_create();
1431 membuffer_write_atom(buf, "meta", meta_size, meta_buffer);
1435 *out_size = membuffer_get_size(buf);
1436 *out_buffer = membuffer_detach(buf);
1440 static uint32_t fix_byte_order_32(uint32_t src)
1442 return read_u32_be(&src);
1445 static void *modify_moov(struct mp4 *f, uint32_t *out_size)
1448 uint64_t total_base = f->moov_offset + 8;
1449 uint32_t total_size = (uint32_t) (f->moov_size - 8);
1450 uint64_t udta_offset, meta_offset, ilst_offset;
1451 uint32_t udta_size, meta_size, ilst_size;
1452 uint32_t new_ilst_size;
1453 void *new_ilst_buffer, *out_buffer;
1458 ret = find_atom_v2(f, total_base, total_size, "udta", 0, "meta");
1462 struct membuffer *buf;
1463 void *new_udta_buffer;
1464 uint32_t new_udta_size;
1465 if (!create_udta(&f->meta, &new_udta_buffer, &new_udta_size))
1468 buf = membuffer_create();
1469 set_position(f, total_base);
1470 if (!membuffer_transfer_from_file(buf, f, total_size)) {
1471 free(new_udta_buffer);
1474 membuffer_write_atom(buf, "udta", new_udta_size,
1477 free(new_udta_buffer);
1479 *out_size = membuffer_get_size(buf);
1480 return membuffer_detach(buf);
1482 udta_offset = get_position(f);
1483 ret = read_int32(f, &udta_size);
1486 ret = find_atom_v2(f, udta_offset + 8, udta_size - 8, "meta", 4, "ilst");
1490 struct membuffer *buf;
1491 void *new_meta_buffer;
1492 uint32_t new_meta_size;
1494 if (!create_meta(&f->meta, &new_meta_buffer, &new_meta_size))
1497 buf = membuffer_create();
1498 set_position(f, total_base);
1499 if (!membuffer_transfer_from_file(buf, f,
1500 udta_offset - total_base)) {
1501 free(new_meta_buffer);
1505 membuffer_write_int32(buf, udta_size + 8 + new_meta_size);
1506 membuffer_write_atom_name(buf, "udta");
1507 if (!membuffer_transfer_from_file(buf, f, udta_size)) {
1508 free(new_meta_buffer);
1511 membuffer_write_atom(buf, "meta", new_meta_size,
1513 free(new_meta_buffer);
1515 *out_size = membuffer_get_size(buf);
1516 return membuffer_detach(buf);
1518 meta_offset = get_position(f);
1519 ret = read_int32(f, &meta_size);
1522 /* shouldn't happen, find_atom_v2 above takes care of it */
1523 if (!find_atom(f, meta_offset + 12, meta_size - 12, "ilst"))
1525 ilst_offset = get_position(f);
1526 ret = read_int32(f, &ilst_size);
1529 if (!create_ilst(&f->meta, &new_ilst_buffer, &new_ilst_size))
1531 size_delta = new_ilst_size - (ilst_size - 8);
1532 *out_size = total_size + size_delta;
1533 out_buffer = para_malloc(*out_size);
1535 set_position(f, total_base);
1536 ret = read_data(f, p_out, udta_offset - total_base);
1539 p_out += (uint32_t) (udta_offset - total_base);
1540 ret = read_int32(f, &tmp);
1543 *(uint32_t *)p_out = fix_byte_order_32(tmp + size_delta);
1545 ret = read_data(f, p_out, 4);
1549 ret = read_data(f, p_out, meta_offset - udta_offset - 8);
1552 p_out += (uint32_t) (meta_offset - udta_offset - 8);
1553 ret = read_int32(f, &tmp);
1556 *(uint32_t *)p_out = fix_byte_order_32(tmp + size_delta);
1558 ret = read_data(f, p_out, 4);
1562 ret = read_data(f, p_out, ilst_offset - meta_offset - 8);
1565 p_out += (uint32_t) (ilst_offset - meta_offset - 8);
1566 ret = read_int32(f, &tmp);
1569 *(uint32_t *)p_out = fix_byte_order_32(tmp + size_delta);
1571 ret = read_data(f, p_out, 4);
1575 memcpy(p_out, new_ilst_buffer, new_ilst_size);
1576 p_out += new_ilst_size;
1577 set_position(f, ilst_offset + ilst_size);
1578 ret = read_data(f, p_out, total_size
1579 - (ilst_offset - total_base) - ilst_size);
1582 free(new_ilst_buffer);
1586 static int32_t write_data(struct mp4 *f, void *data, uint32_t size)
1590 result = f->cb->write(f->cb->user_data, data, size);
1592 f->current_position += size;
1597 static int32_t write_int32(struct mp4 *f, uint32_t data)
1600 write_u32_be(temp, data);
1601 return write_data(f, temp, sizeof(temp));
1604 int32_t mp4_meta_update(struct mp4 *f)
1606 void *new_moov_data;
1607 uint32_t new_moov_size;
1610 new_moov_data = modify_moov(f, &new_moov_size);
1611 if (!new_moov_data ) {
1615 /* copy moov atom to end of the file */
1616 if (f->last_atom != ATOM_MOOV) {
1617 char *free_data = "free";
1619 /* rename old moov to free */
1620 set_position(f, f->moov_offset + 4);
1621 write_data(f, free_data, 4);
1623 set_position(f, f->file_size);
1624 write_int32(f, new_moov_size + 8);
1625 write_data(f, "moov", 4);
1626 write_data(f, new_moov_data, new_moov_size);
1628 set_position(f, f->moov_offset);
1629 write_int32(f, new_moov_size + 8);
1630 write_data(f, "moov", 4);
1631 write_data(f, new_moov_data, new_moov_size);
1633 free(new_moov_data);
1634 f->cb->truncate(f->cb->user_data);
1638 static char *meta_find_by_name(const struct mp4 *f, const char *item)
1642 for (i = 0; i < f->meta.count; i++)
1643 if (!strcasecmp(f->meta.tags[i].item, item))
1644 return para_strdup(f->meta.tags[i].value);
1649 * Return the value of the artist meta tag of an mp4 file.
1651 * \param f Must not be NULL.
1653 * \return If the file does not contain this metadata tag, the function returns
1654 * NULL. Otherwise, a copy of the tag value is returned. The caller should free
1655 * this memory when it is no longer needed.
1657 char *mp4_meta_get_artist(const struct mp4 *f)
1659 return meta_find_by_name(f, "artist");
1663 * Return the value of the title meta tag of an mp4 file.
1665 * \param f See \ref mp4_meta_get_artist().
1666 * \return See \ref mp4_meta_get_artist().
1668 char *mp4_meta_get_title(const struct mp4 *f)
1670 return meta_find_by_name(f, "title");
1674 * Return the value of the date meta tag of an mp4 file.
1676 * \param f See \ref mp4_meta_get_artist().
1677 * \return See \ref mp4_meta_get_artist().
1679 char *mp4_meta_get_date(const struct mp4 *f)
1681 return meta_find_by_name(f, "date");
1685 * Return the value of the album meta tag of an mp4 file.
1687 * \param f See \ref mp4_meta_get_artist().
1688 * \return See \ref mp4_meta_get_artist().
1690 char *mp4_meta_get_album(const struct mp4 *f)
1692 return meta_find_by_name(f, "album");
1696 * Return the value of the comment meta tag of an mp4 file.
1698 * \param f See \ref mp4_meta_get_artist().
1699 * \return See \ref mp4_meta_get_artist().
1701 char *mp4_meta_get_comment(const struct mp4 *f)
1703 return meta_find_by_name(f, "comment");