ref: 571ea294b58a6b39eb15a58570aa0dac39655e56
dir: /common/mp4ff/mp4atom.c/
/*
** FAAD2 - Freeware Advanced Audio (AAC) Decoder including SBR decoding
** Copyright (C) 2003 M. Bakker, Ahead Software AG, http://www.nero.com
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** This program is distributed in the hope that it will be useful,
** but WITHOUT ANY WARRANTY; without even the implied warranty of
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
** GNU General Public License for more details.
**
** You should have received a copy of the GNU General Public License
** along with this program; if not, write to the Free Software
** Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
**
** Any non-GPL usage of this software or parts of this software is strictly
** forbidden.
**
** Commercial non-GPL licensing of this software is possible.
** For more info contact Ahead Software through Mpeg4AAClicense@nero.com.
**
** $Id: mp4atom.c,v 1.3 2003/11/21 19:02:02 menno Exp $
**/
#include <stdlib.h>
#include "mp4ff.h"
/* parse atom header size */
int32_t mp4ff_atom_get_size(int8_t *data)
{
uint32_t result;
uint32_t a, b, c, d;
a = (uint8_t)data[0];
b = (uint8_t)data[1];
c = (uint8_t)data[2];
d = (uint8_t)data[3];
result = (a<<24) | (b<<16) | (c<<8) | d;
if (result > 0 && result < 8) result = 8;
return (int32_t)result;
}
/* comnapre 2 atom names, returns 1 for equal, 0 for unequal */
int32_t mp4ff_atom_compare(int8_t a1, int8_t b1, int8_t c1, int8_t d1,
int8_t a2, int8_t b2, int8_t c2, int8_t d2)
{
if (a1 == a2 && b1 == b2 && c1 == c2 && d1 == d2)
return 1;
else
return 0;
}
uint8_t mp4ff_atom_name_to_type(int8_t a, int8_t b, int8_t c, int8_t d)
{
if (a == 'm')
{
if (mp4ff_atom_compare(a,b,c,d, 'm','o','o','v'))
return ATOM_MOOV;
else if (mp4ff_atom_compare(a,b,c,d, 'm','i','n','f'))
return ATOM_MINF;
else if (mp4ff_atom_compare(a,b,c,d, 'm','d','i','a'))
return ATOM_MDIA;
else if (mp4ff_atom_compare(a,b,c,d, 'm','d','a','t'))
return ATOM_MDAT;
else if (mp4ff_atom_compare(a,b,c,d, 'm','d','h','d'))
return ATOM_MDHD;
else if (mp4ff_atom_compare(a,b,c,d, 'm','v','h','d'))
return ATOM_MVHD;
else if (mp4ff_atom_compare(a,b,c,d, 'm','p','4','a'))
return ATOM_MP4A;
else if (mp4ff_atom_compare(a,b,c,d, 'm','p','4','v'))
return ATOM_MP4V;
else if (mp4ff_atom_compare(a,b,c,d, 'm','p','4','s'))
return ATOM_MP4S;
} else if (a == 't') {
if (mp4ff_atom_compare(a,b,c,d, 't','r','a','k'))
return ATOM_TRAK;
else if (mp4ff_atom_compare(a,b,c,d, 't','k','h','d'))
return ATOM_TKHD;
else if (mp4ff_atom_compare(a,b,c,d, 't','r','e','f'))
return ATOM_TREF;
} else if (a == 's') {
if (mp4ff_atom_compare(a,b,c,d, 's','t','b','l'))
return ATOM_STBL;
else if (mp4ff_atom_compare(a,b,c,d, 's','m','h','d'))
return ATOM_SMHD;
else if (mp4ff_atom_compare(a,b,c,d, 's','t','s','d'))
return ATOM_STSD;
else if (mp4ff_atom_compare(a,b,c,d, 's','t','t','s'))
return ATOM_STTS;
else if (mp4ff_atom_compare(a,b,c,d, 's','t','c','o'))
return ATOM_STCO;
else if (mp4ff_atom_compare(a,b,c,d, 's','t','s','c'))
return ATOM_STSC;
else if (mp4ff_atom_compare(a,b,c,d, 's','t','s','z'))
return ATOM_STSZ;
else if (mp4ff_atom_compare(a,b,c,d, 's','t','z','2'))
return ATOM_STZ2;
else if (mp4ff_atom_compare(a,b,c,d, 's','k','i','p'))
return ATOM_SKIP;
}
if (mp4ff_atom_compare(a,b,c,d, 'e','d','t','s'))
return ATOM_EDTS;
else if (mp4ff_atom_compare(a,b,c,d, 'e','s','d','s'))
return ATOM_ESDS;
else if (mp4ff_atom_compare(a,b,c,d, 'f','t','y','p'))
return ATOM_FTYP;
else if (mp4ff_atom_compare(a,b,c,d, 'f','r','e','e'))
return ATOM_FREE;
else if (mp4ff_atom_compare(a,b,c,d, 'h','m','h','d'))
return ATOM_HMHD;
else if (mp4ff_atom_compare(a,b,c,d, 'v','m','h','d'))
return ATOM_VMHD;
else
return ATOM_UNKNOWN;
}
/* read atom header, return atom size, atom size is with header included */
int32_t mp4ff_atom_read_header(mp4ff_t *f, uint8_t *atom_type)
{
int32_t size;
int32_t ret;
int8_t atom_header[8];
ret = mp4ff_read_data(f, atom_header, 8);
if (ret != 8)
return 0;
size = mp4ff_atom_get_size(atom_header);
//fprintf(stdout, "%c%c%c%c\n", atom_header[4], atom_header[5], atom_header[6], atom_header[7]);
*atom_type = mp4ff_atom_name_to_type(atom_header[4], atom_header[5], atom_header[6], atom_header[7]);
return size;
}
int32_t mp4ff_read_stsz(mp4ff_t *f)
{
/* version */ mp4ff_read_char(f);
/* flags */ mp4ff_read_int24(f);
f->track[f->total_tracks - 1]->stsz_sample_size = mp4ff_read_int32(f);
f->track[f->total_tracks - 1]->stsz_sample_count = mp4ff_read_int32(f);
if (f->track[f->total_tracks - 1]->stsz_sample_size == 0)
{
int32_t i;
f->track[f->total_tracks - 1]->stsz_table =
(int32_t*)malloc(f->track[f->total_tracks - 1]->stsz_sample_count*sizeof(int32_t));
for (i = 0; i < f->track[f->total_tracks - 1]->stsz_sample_count; i++)
{
f->track[f->total_tracks - 1]->stsz_table[i] = mp4ff_read_int32(f);
}
}
return 0;
}
int32_t mp4ff_read_esds(mp4ff_t *f)
{
uint8_t tag;
mp4ff_read_char(f); /* version */
mp4ff_read_int24(f); /* flags */
/* get and verify ES_DescrTag */
tag = mp4ff_read_char(f);
if (tag == 0x03)
{
/* read length */
if (mp4ff_read_mp4_descr_length(f) < 5 + 15)
{
return 1;
}
/* skip 3 bytes */
mp4ff_read_int24(f);
} else {
/* skip 2 bytes */
mp4ff_read_int16(f);
}
/* get and verify DecoderConfigDescrTab */
if (mp4ff_read_char(f) != 0x04)
{
return 1;
}
/* read length */
if (mp4ff_read_mp4_descr_length(f) < 15)
{
return 1;
}
/* skip 13 bytes */
mp4ff_read_int32(f);
mp4ff_read_int32(f);
mp4ff_read_int32(f);
mp4ff_read_char(f);
/* get and verify DecSpecificInfoTag */
if (mp4ff_read_char(f) != 0x05)
{
return 1;
}
/* read length */
f->track[f->total_tracks - 1]->decoderConfigLen = mp4ff_read_mp4_descr_length(f);
if (f->track[f->total_tracks - 1]->decoderConfig)
free(f->track[f->total_tracks - 1]->decoderConfig);
f->track[f->total_tracks - 1]->decoderConfig = malloc(f->track[f->total_tracks - 1]->decoderConfigLen);
if (f->track[f->total_tracks - 1]->decoderConfig)
{
mp4ff_read_data(f, f->track[f->total_tracks - 1]->decoderConfig, f->track[f->total_tracks - 1]->decoderConfigLen);
} else {
f->track[f->total_tracks - 1]->decoderConfigLen = 0;
}
/* will skip the remainder of the atom */
return 0;
}
int32_t mp4ff_read_mp4a(mp4ff_t *f)
{
int32_t i, size;
uint8_t atom_type = 0;
for (i = 0; i < 6; i++)
{
mp4ff_read_char(f); /* reserved */
}
/* data_reference_index */ mp4ff_read_int16(f);
mp4ff_read_int32(f); /* reserved */
mp4ff_read_int32(f); /* reserved */
f->track[f->total_tracks - 1]->channelCount = mp4ff_read_int16(f);
f->track[f->total_tracks - 1]->sampleSize = mp4ff_read_int16(f);
mp4ff_read_int16(f);
mp4ff_read_int16(f);
f->track[f->total_tracks - 1]->sampleRate = mp4ff_read_int16(f);
mp4ff_read_int16(f);
size = mp4ff_atom_read_header(f, &atom_type);
if (atom_type == ATOM_ESDS)
{
mp4ff_read_esds(f);
}
return 0;
}
int32_t mp4ff_read_stsd(mp4ff_t *f)
{
int32_t i;
mp4ff_read_char(f); /* version */
mp4ff_read_int24(f); /* flags */
f->track[f->total_tracks - 1]->stsd_entry_count = mp4ff_read_int32(f);
for (i = 0; i < f->track[f->total_tracks - 1]->stsd_entry_count; i++)
{
int32_t skip = mp4ff_position(f);
int32_t size;
uint8_t atom_type = 0;
size = mp4ff_atom_read_header(f, &atom_type);
skip += size;
if (atom_type == ATOM_MP4A)
{
f->track[f->total_tracks - 1]->type = TRACK_AUDIO;
mp4ff_read_mp4a(f);
} else if (atom_type == ATOM_MP4V) {
f->track[f->total_tracks - 1]->type = TRACK_VIDEO;
} else if (atom_type == ATOM_MP4S) {
f->track[f->total_tracks - 1]->type = TRACK_SYSTEM;
} else {
f->track[f->total_tracks - 1]->type = TRACK_UNKNOWN;
}
mp4ff_set_position(f, skip);
}
return 0;
}
int32_t mp4ff_read_stsc(mp4ff_t *f)
{
int32_t i;
mp4ff_read_char(f); /* version */
mp4ff_read_int24(f); /* flags */
f->track[f->total_tracks - 1]->stsc_entry_count = mp4ff_read_int32(f);
f->track[f->total_tracks - 1]->stsc_first_chunk =
(int32_t*)malloc(f->track[f->total_tracks - 1]->stsc_entry_count*sizeof(int32_t));
f->track[f->total_tracks - 1]->stsc_samples_per_chunk =
(int32_t*)malloc(f->track[f->total_tracks - 1]->stsc_entry_count*sizeof(int32_t));
f->track[f->total_tracks - 1]->stsc_sample_desc_index =
(int32_t*)malloc(f->track[f->total_tracks - 1]->stsc_entry_count*sizeof(int32_t));
for (i = 0; i < f->track[f->total_tracks - 1]->stsc_entry_count; i++)
{
f->track[f->total_tracks - 1]->stsc_first_chunk[i] = mp4ff_read_int32(f);
f->track[f->total_tracks - 1]->stsc_samples_per_chunk[i] = mp4ff_read_int32(f);
f->track[f->total_tracks - 1]->stsc_sample_desc_index[i] = mp4ff_read_int32(f);
}
return 0;
}
int32_t mp4ff_read_stco(mp4ff_t *f)
{
int32_t i;
/* version */ mp4ff_read_char(f);
/* flags */ mp4ff_read_int24(f);
f->track[f->total_tracks - 1]->stco_entry_count = mp4ff_read_int32(f);
f->track[f->total_tracks - 1]->stco_chunk_offset =
(int32_t*)malloc(f->track[f->total_tracks - 1]->stco_entry_count*sizeof(int32_t));
for (i = 0; i < f->track[f->total_tracks - 1]->stco_entry_count; i++)
{
f->track[f->total_tracks - 1]->stco_chunk_offset[i] = mp4ff_read_int32(f);
}
return 0;
}
int32_t mp4ff_read_stts(mp4ff_t *f)
{
int32_t i;
mp4ff_read_char(f); /* version */
mp4ff_read_int24(f); /* flags */
f->track[f->total_tracks - 1]->stts_entry_count = mp4ff_read_int32(f);
f->track[f->total_tracks - 1]->stts_sample_count = (int32_t*)malloc(f->track[f->total_tracks - 1]->stts_entry_count * sizeof(int32_t));
f->track[f->total_tracks - 1]->stts_sample_delta = (int32_t*)malloc(f->track[f->total_tracks - 1]->stts_entry_count * sizeof(int32_t));
for (i = 0; i < f->track[f->total_tracks - 1]->stts_entry_count; i++)
{
f->track[f->total_tracks - 1]->stts_sample_count[i] = mp4ff_read_int32(f);
f->track[f->total_tracks - 1]->stts_sample_delta[i] = mp4ff_read_int32(f);
}
return 0;
}
int32_t mp4ff_read_mvhd(mp4ff_t *f)
{
int32_t i;
/* version */ mp4ff_read_char(f);
/* flags */ mp4ff_read_int24(f);
/* creation_time */ mp4ff_read_int32(f);
/* modification_time */ mp4ff_read_int32(f);
f->time_scale = mp4ff_read_int32(f);
f->duration = mp4ff_read_int32(f);
/* preferred_rate */ mp4ff_read_int32(f); /*mp4ff_read_fixed32(f);*/
/* preferred_volume */ mp4ff_read_int16(f); /*mp4ff_read_fixed16(f);*/
for (i = 0; i < 10; i++)
{
/* reserved */ mp4ff_read_char(f);
}
for (i = 0; i < 9; i++)
{
mp4ff_read_int32(f); /* matrix */
}
/* preview_time */ mp4ff_read_int32(f);
/* preview_duration */ mp4ff_read_int32(f);
/* poster_time */ mp4ff_read_int32(f);
/* selection_time */ mp4ff_read_int32(f);
/* selection_duration */ mp4ff_read_int32(f);
/* current_time */ mp4ff_read_int32(f);
/* next_track_id */ mp4ff_read_int32(f);
return 0;
}
int32_t mp4ff_atom_read(mp4ff_t *f, int32_t size, uint8_t atom_type)
{
if (atom_type == ATOM_STSZ)
{
/* sample size box */
mp4ff_read_stsz(f);
} else if (atom_type == ATOM_STTS) {
/* time to sample box */
mp4ff_read_stts(f);
} else if (atom_type == ATOM_STSC) {
/* sample to chunk box */
mp4ff_read_stsc(f);
} else if (atom_type == ATOM_STCO) {
/* chunk offset box */
mp4ff_read_stco(f);
} else if (atom_type == ATOM_STSD) {
/* sample description box */
mp4ff_read_stsd(f);
} else if (atom_type == ATOM_MVHD) {
/* movie header box */
mp4ff_read_mvhd(f);
} else {
/* skip this atom: not needed for reading */
mp4ff_set_position(f, mp4ff_position(f)+size-8);
}
return 0;
}