forked from len0rd/rockbox
Remove generic M4A parsing code from libalac and create a libm4a - so it can be used by other codecs
git-svn-id: svn://svn.rockbox.org/rockbox/trunk@7682 a1c6a512-1295-4272-9138-f99709370657
This commit is contained in:
Dave Chapman
parent
e75cbdd2a8
commit
45f9e5d7b0
10 changed files with 400 additions and 300 deletions
655
apps/codecs/libm4a/demux.c
Normal file
655
apps/codecs/libm4a/demux.c
Normal file
|
|
@ -0,0 +1,655 @@
|
|||
/*
|
||||
* ALAC (Apple Lossless Audio Codec) decoder
|
||||
* Copyright (c) 2005 David Hammerton
|
||||
* All rights reserved.
|
||||
*
|
||||
* This is the quicktime container demuxer.
|
||||
*
|
||||
* http://crazney.net/programs/itunes/alac.html
|
||||
*
|
||||
* Permission is hereby granted, free of charge, to any person
|
||||
* obtaining a copy of this software and associated documentation
|
||||
* files (the "Software"), to deal in the Software without
|
||||
* restriction, including without limitation the rights to use,
|
||||
* copy, modify, merge, publish, distribute, sublicense, and/or
|
||||
* sell copies of the Software, and to permit persons to whom the
|
||||
* Software is furnished to do so, subject to the following conditions:
|
||||
*
|
||||
* The above copyright notice and this permission notice shall be
|
||||
* included in all copies or substantial portions of the Software.
|
||||
*
|
||||
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
|
||||
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
|
||||
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
|
||||
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
|
||||
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
|
||||
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
|
||||
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
|
||||
* OTHER DEALINGS IN THE SOFTWARE.
|
||||
*
|
||||
*/
|
||||
|
||||
#include <string.h>
|
||||
#include <inttypes.h>
|
||||
#include <stdlib.h>
|
||||
|
||||
#include "../codec.h"
|
||||
|
||||
#include "m4a.h"
|
||||
|
||||
typedef struct
|
||||
{
|
||||
stream_t *stream;
|
||||
demux_res_t *res;
|
||||
} qtmovie_t;
|
||||
|
||||
|
||||
/* chunk handlers */
|
||||
static void read_chunk_ftyp(qtmovie_t *qtmovie, size_t chunk_len)
|
||||
{
|
||||
fourcc_t type;
|
||||
uint32_t minor_ver;
|
||||
size_t size_remaining = chunk_len - 8; /* FIXME: can't hardcode 8, size may be 64bit */
|
||||
|
||||
type = stream_read_uint32(qtmovie->stream);
|
||||
size_remaining-=4;
|
||||
if (type != MAKEFOURCC('M','4','A',' '))
|
||||
{
|
||||
//fprintf(stderr, "not M4A file\n");
|
||||
return;
|
||||
}
|
||||
minor_ver = stream_read_uint32(qtmovie->stream);
|
||||
size_remaining-=4;
|
||||
|
||||
/* compatible brands */
|
||||
while (size_remaining)
|
||||
{
|
||||
/* unused */
|
||||
/*fourcc_t cbrand =*/ stream_read_uint32(qtmovie->stream);
|
||||
size_remaining-=4;
|
||||
}
|
||||
}
|
||||
|
||||
static void read_chunk_tkhd(qtmovie_t *qtmovie, size_t chunk_len)
|
||||
{
|
||||
/* don't need anything from here atm, skip */
|
||||
size_t size_remaining = chunk_len - 8; /* FIXME WRONG */
|
||||
|
||||
stream_skip(qtmovie->stream, size_remaining);
|
||||
}
|
||||
|
||||
static void read_chunk_mdhd(qtmovie_t *qtmovie, size_t chunk_len)
|
||||
{
|
||||
/* don't need anything from here atm, skip */
|
||||
size_t size_remaining = chunk_len - 8; /* FIXME WRONG */
|
||||
|
||||
stream_skip(qtmovie->stream, size_remaining);
|
||||
}
|
||||
|
||||
/* media handler inside mdia */
|
||||
static void read_chunk_hdlr(qtmovie_t *qtmovie, size_t chunk_len)
|
||||
{
|
||||
fourcc_t comptype, compsubtype;
|
||||
size_t size_remaining = chunk_len - 8; /* FIXME WRONG */
|
||||
|
||||
int strlen;
|
||||
char str[256] = {0};
|
||||
|
||||
/* version */
|
||||
stream_read_uint8(qtmovie->stream);
|
||||
size_remaining -= 1;
|
||||
/* flags */
|
||||
stream_read_uint8(qtmovie->stream);
|
||||
stream_read_uint8(qtmovie->stream);
|
||||
stream_read_uint8(qtmovie->stream);
|
||||
size_remaining -= 3;
|
||||
|
||||
/* component type */
|
||||
comptype = stream_read_uint32(qtmovie->stream);
|
||||
compsubtype = stream_read_uint32(qtmovie->stream);
|
||||
size_remaining -= 8;
|
||||
|
||||
/* component manufacturer */
|
||||
stream_read_uint32(qtmovie->stream);
|
||||
size_remaining -= 4;
|
||||
|
||||
/* flags */
|
||||
stream_read_uint32(qtmovie->stream);
|
||||
stream_read_uint32(qtmovie->stream);
|
||||
size_remaining -= 8;
|
||||
|
||||
/* name */
|
||||
strlen = stream_read_uint8(qtmovie->stream);
|
||||
stream_read(qtmovie->stream, strlen, str);
|
||||
size_remaining -= 1 + strlen;
|
||||
|
||||
if (size_remaining)
|
||||
{
|
||||
stream_skip(qtmovie->stream, size_remaining);
|
||||
}
|
||||
|
||||
}
|
||||
|
||||
static bool read_chunk_stsd(qtmovie_t *qtmovie, size_t chunk_len)
|
||||
{
|
||||
unsigned int i;
|
||||
uint32_t numentries;
|
||||
size_t size_remaining = chunk_len - 8; /* FIXME WRONG */
|
||||
|
||||
/* version */
|
||||
stream_read_uint8(qtmovie->stream);
|
||||
size_remaining -= 1;
|
||||
/* flags */
|
||||
stream_read_uint8(qtmovie->stream);
|
||||
stream_read_uint8(qtmovie->stream);
|
||||
stream_read_uint8(qtmovie->stream);
|
||||
size_remaining -= 3;
|
||||
|
||||
numentries = stream_read_uint32(qtmovie->stream);
|
||||
size_remaining -= 4;
|
||||
|
||||
if (numentries != 1)
|
||||
{
|
||||
//fprintf(stderr, "only expecting one entry in sample description atom!\n");
|
||||
return false;
|
||||
}
|
||||
|
||||
for (i = 0; i < numentries; i++)
|
||||
{
|
||||
uint32_t entry_size;
|
||||
uint16_t version;
|
||||
|
||||
uint32_t entry_remaining;
|
||||
|
||||
entry_size = stream_read_uint32(qtmovie->stream);
|
||||
qtmovie->res->format = stream_read_uint32(qtmovie->stream);
|
||||
entry_remaining = entry_size;
|
||||
entry_remaining -= 8;
|
||||
|
||||
/* sound info: */
|
||||
|
||||
stream_skip(qtmovie->stream, 6); /* reserved */
|
||||
entry_remaining -= 6;
|
||||
|
||||
version = stream_read_uint16(qtmovie->stream);
|
||||
// if (version != 1)
|
||||
//fprintf(stderr, "unknown version??\n");
|
||||
entry_remaining -= 2;
|
||||
|
||||
/* revision level */
|
||||
stream_read_uint16(qtmovie->stream);
|
||||
/* vendor */
|
||||
stream_read_uint32(qtmovie->stream);
|
||||
entry_remaining -= 6;
|
||||
|
||||
/* EH?? spec doesn't say theres an extra 16 bits here.. but there is! */
|
||||
stream_read_uint16(qtmovie->stream);
|
||||
entry_remaining -= 2;
|
||||
|
||||
qtmovie->res->num_channels = stream_read_uint16(qtmovie->stream);
|
||||
|
||||
qtmovie->res->sample_size = stream_read_uint16(qtmovie->stream);
|
||||
entry_remaining -= 4;
|
||||
|
||||
/* compression id */
|
||||
stream_read_uint16(qtmovie->stream);
|
||||
/* packet size */
|
||||
stream_read_uint16(qtmovie->stream);
|
||||
entry_remaining -= 4;
|
||||
|
||||
/* sample rate - 32bit fixed point = 16bit?? */
|
||||
qtmovie->res->sample_rate = stream_read_uint16(qtmovie->stream);
|
||||
entry_remaining -= 2;
|
||||
|
||||
/* skip 2 */
|
||||
stream_skip(qtmovie->stream, 2);
|
||||
entry_remaining -= 2;
|
||||
|
||||
/* remaining is codec data */
|
||||
|
||||
#if 0
|
||||
qtmovie->res->codecdata_len = stream_read_uint32(qtmovie->stream);
|
||||
if (qtmovie->res->codecdata_len != entry_remaining)
|
||||
fprintf(stderr, "perhaps not? %i vs %i\n",
|
||||
qtmovie->res->codecdata_len, entry_remaining);
|
||||
entry_remaining -= 4;
|
||||
stream_read_uint32(qtmovie->stream); /* 'alac' */
|
||||
entry_remaining -= 4;
|
||||
|
||||
qtmovie->res->codecdata = malloc(qtmovie->res->codecdata_len - 8);
|
||||
|
||||
stream_read(qtmovie->stream,
|
||||
entry_remaining,
|
||||
qtmovie->res->codecdata);
|
||||
entry_remaining = 0;
|
||||
|
||||
#else
|
||||
/* 12 = audio format atom, 8 = padding */
|
||||
qtmovie->res->codecdata_len = entry_remaining + 12 + 8;
|
||||
qtmovie->res->codecdata = malloc(qtmovie->res->codecdata_len);
|
||||
memset(qtmovie->res->codecdata, 0, qtmovie->res->codecdata_len);
|
||||
/* audio format atom */
|
||||
((unsigned int*)qtmovie->res->codecdata)[0] = 0x0c000000;
|
||||
((unsigned int*)qtmovie->res->codecdata)[1] = MAKEFOURCC('a','m','r','f');
|
||||
((unsigned int*)qtmovie->res->codecdata)[2] = MAKEFOURCC('c','a','l','a');
|
||||
|
||||
stream_read(qtmovie->stream,
|
||||
entry_remaining,
|
||||
((char*)qtmovie->res->codecdata) + 12);
|
||||
entry_remaining -= entry_remaining;
|
||||
|
||||
#endif
|
||||
if (entry_remaining)
|
||||
stream_skip(qtmovie->stream, entry_remaining);
|
||||
|
||||
if (qtmovie->res->format != MAKEFOURCC('a','l','a','c'))
|
||||
{
|
||||
// fprintf(stderr, "expecting 'alac' data format, got %c%c%c%c\n",
|
||||
// SPLITFOURCC(qtmovie->res->format));
|
||||
return false;
|
||||
}
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
static void read_chunk_stts(qtmovie_t *qtmovie, size_t chunk_len)
|
||||
{
|
||||
unsigned int i;
|
||||
uint32_t numentries;
|
||||
size_t size_remaining = chunk_len - 8; /* FIXME WRONG */
|
||||
|
||||
/* version */
|
||||
stream_read_uint8(qtmovie->stream);
|
||||
size_remaining -= 1;
|
||||
/* flags */
|
||||
stream_read_uint8(qtmovie->stream);
|
||||
stream_read_uint8(qtmovie->stream);
|
||||
stream_read_uint8(qtmovie->stream);
|
||||
size_remaining -= 3;
|
||||
|
||||
numentries = stream_read_uint32(qtmovie->stream);
|
||||
size_remaining -= 4;
|
||||
|
||||
qtmovie->res->num_time_to_samples = numentries;
|
||||
qtmovie->res->time_to_sample = malloc(numentries * sizeof(*qtmovie->res->time_to_sample));
|
||||
|
||||
for (i = 0; i < numentries; i++)
|
||||
{
|
||||
qtmovie->res->time_to_sample[i].sample_count = stream_read_uint32(qtmovie->stream);
|
||||
qtmovie->res->time_to_sample[i].sample_duration = stream_read_uint32(qtmovie->stream);
|
||||
size_remaining -= 8;
|
||||
}
|
||||
|
||||
if (size_remaining)
|
||||
{
|
||||
//fprintf(stderr, "ehm, size remianing?\n");
|
||||
stream_skip(qtmovie->stream, size_remaining);
|
||||
}
|
||||
}
|
||||
|
||||
static void read_chunk_stsz(qtmovie_t *qtmovie, size_t chunk_len)
|
||||
{
|
||||
unsigned int i;
|
||||
uint32_t numentries;
|
||||
size_t size_remaining = chunk_len - 8; /* FIXME WRONG */
|
||||
|
||||
/* version */
|
||||
stream_read_uint8(qtmovie->stream);
|
||||
size_remaining -= 1;
|
||||
/* flags */
|
||||
stream_read_uint8(qtmovie->stream);
|
||||
stream_read_uint8(qtmovie->stream);
|
||||
stream_read_uint8(qtmovie->stream);
|
||||
size_remaining -= 3;
|
||||
|
||||
/* default sample size */
|
||||
if (stream_read_uint32(qtmovie->stream) != 0)
|
||||
{
|
||||
//fprintf(stderr, "i was expecting variable samples sizes\n");
|
||||
stream_read_uint32(qtmovie->stream);
|
||||
size_remaining -= 4;
|
||||
return;
|
||||
}
|
||||
size_remaining -= 4;
|
||||
|
||||
numentries = stream_read_uint32(qtmovie->stream);
|
||||
size_remaining -= 4;
|
||||
|
||||
qtmovie->res->num_sample_byte_sizes = numentries;
|
||||
qtmovie->res->sample_byte_size = malloc(numentries * sizeof(*qtmovie->res->sample_byte_size));
|
||||
|
||||
for (i = 0; i < numentries; i++)
|
||||
{
|
||||
qtmovie->res->sample_byte_size[i] = stream_read_uint32(qtmovie->stream);
|
||||
size_remaining -= 4;
|
||||
}
|
||||
|
||||
if (size_remaining)
|
||||
{
|
||||
//fprintf(stderr, "ehm, size remianing?\n");
|
||||
stream_skip(qtmovie->stream, size_remaining);
|
||||
}
|
||||
}
|
||||
|
||||
static bool read_chunk_stbl(qtmovie_t *qtmovie, size_t chunk_len)
|
||||
{
|
||||
size_t size_remaining = chunk_len - 8; /* FIXME WRONG */
|
||||
|
||||
while (size_remaining)
|
||||
{
|
||||
size_t sub_chunk_len;
|
||||
fourcc_t sub_chunk_id;
|
||||
|
||||
sub_chunk_len = stream_read_uint32(qtmovie->stream);
|
||||
if (sub_chunk_len <= 1 || sub_chunk_len > size_remaining)
|
||||
{
|
||||
//fprintf(stderr, "strange size for chunk inside stbl\n");
|
||||
return false;
|
||||
}
|
||||
|
||||
sub_chunk_id = stream_read_uint32(qtmovie->stream);
|
||||
|
||||
switch (sub_chunk_id)
|
||||
{
|
||||
case MAKEFOURCC('s','t','s','d'):
|
||||
if (!read_chunk_stsd(qtmovie, sub_chunk_len)) {
|
||||
return false;
|
||||
}
|
||||
break;
|
||||
case MAKEFOURCC('s','t','t','s'):
|
||||
read_chunk_stts(qtmovie, sub_chunk_len);
|
||||
break;
|
||||
case MAKEFOURCC('s','t','s','z'):
|
||||
read_chunk_stsz(qtmovie, sub_chunk_len);
|
||||
break;
|
||||
case MAKEFOURCC('s','t','s','c'):
|
||||
case MAKEFOURCC('s','t','c','o'):
|
||||
/* skip these, no indexing for us! */
|
||||
stream_skip(qtmovie->stream, sub_chunk_len - 8);
|
||||
break;
|
||||
default:
|
||||
// fprintf(stderr, "(stbl) unknown chunk id: %c%c%c%c\n",
|
||||
// SPLITFOURCC(sub_chunk_id));
|
||||
return false;
|
||||
}
|
||||
|
||||
size_remaining -= sub_chunk_len;
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
static bool read_chunk_minf(qtmovie_t *qtmovie, size_t chunk_len)
|
||||
{
|
||||
size_t dinf_size, stbl_size;
|
||||
size_t size_remaining = chunk_len - 8; /* FIXME WRONG */
|
||||
|
||||
/**** SOUND HEADER CHUNK ****/
|
||||
if (stream_read_uint32(qtmovie->stream) != 16)
|
||||
{
|
||||
//fprintf(stderr, "unexpected size in media info\n");
|
||||
return false;
|
||||
}
|
||||
if (stream_read_uint32(qtmovie->stream) != MAKEFOURCC('s','m','h','d'))
|
||||
{
|
||||
//fprintf(stderr, "not a sound header! can't handle this.\n");
|
||||
return false;
|
||||
}
|
||||
/* now skip the rest */
|
||||
stream_skip(qtmovie->stream, 16 - 8);
|
||||
size_remaining -= 16;
|
||||
/****/
|
||||
|
||||
/**** DINF CHUNK ****/
|
||||
dinf_size = stream_read_uint32(qtmovie->stream);
|
||||
if (stream_read_uint32(qtmovie->stream) != MAKEFOURCC('d','i','n','f'))
|
||||
{
|
||||
//fprintf(stderr, "expected dinf, didn't get it.\n");
|
||||
return false;
|
||||
}
|
||||
/* skip it */
|
||||
stream_skip(qtmovie->stream, dinf_size - 8);
|
||||
size_remaining -= dinf_size;
|
||||
/****/
|
||||
|
||||
|
||||
/**** SAMPLE TABLE ****/
|
||||
stbl_size = stream_read_uint32(qtmovie->stream);
|
||||
if (stream_read_uint32(qtmovie->stream) != MAKEFOURCC('s','t','b','l'))
|
||||
{
|
||||
//fprintf(stderr, "expected stbl, didn't get it.\n");
|
||||
return false;
|
||||
}
|
||||
if (!read_chunk_stbl(qtmovie, stbl_size)) {
|
||||
return false;
|
||||
}
|
||||
|
||||
size_remaining -= stbl_size;
|
||||
|
||||
if (size_remaining)
|
||||
{
|
||||
//fprintf(stderr, "oops\n");
|
||||
stream_skip(qtmovie->stream, size_remaining);
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
static bool read_chunk_mdia(qtmovie_t *qtmovie, size_t chunk_len)
|
||||
{
|
||||
size_t size_remaining = chunk_len - 8; /* FIXME WRONG */
|
||||
|
||||
while (size_remaining)
|
||||
{
|
||||
size_t sub_chunk_len;
|
||||
fourcc_t sub_chunk_id;
|
||||
|
||||
sub_chunk_len = stream_read_uint32(qtmovie->stream);
|
||||
if (sub_chunk_len <= 1 || sub_chunk_len > size_remaining)
|
||||
{
|
||||
//fprintf(stderr, "strange size for chunk inside mdia\n");
|
||||
return false;
|
||||
}
|
||||
|
||||
sub_chunk_id = stream_read_uint32(qtmovie->stream);
|
||||
|
||||
switch (sub_chunk_id)
|
||||
{
|
||||
case MAKEFOURCC('m','d','h','d'):
|
||||
read_chunk_mdhd(qtmovie, sub_chunk_len);
|
||||
break;
|
||||
case MAKEFOURCC('h','d','l','r'):
|
||||
read_chunk_hdlr(qtmovie, sub_chunk_len);
|
||||
break;
|
||||
case MAKEFOURCC('m','i','n','f'):
|
||||
if (!read_chunk_minf(qtmovie, sub_chunk_len)) {
|
||||
return false;
|
||||
}
|
||||
break;
|
||||
default:
|
||||
// fprintf(stderr, "(mdia) unknown chunk id: %c%c%c%c\n",
|
||||
// SPLITFOURCC(sub_chunk_id));
|
||||
return false;
|
||||
}
|
||||
|
||||
size_remaining -= sub_chunk_len;
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
/* 'trak' - a movie track - contains other atoms */
|
||||
static bool read_chunk_trak(qtmovie_t *qtmovie, size_t chunk_len)
|
||||
{
|
||||
size_t size_remaining = chunk_len - 8; /* FIXME WRONG */
|
||||
|
||||
while (size_remaining)
|
||||
{
|
||||
size_t sub_chunk_len;
|
||||
fourcc_t sub_chunk_id;
|
||||
|
||||
sub_chunk_len = stream_read_uint32(qtmovie->stream);
|
||||
if (sub_chunk_len <= 1 || sub_chunk_len > size_remaining)
|
||||
{
|
||||
//fprintf(stderr, "strange size for chunk inside trak\n");
|
||||
return false;
|
||||
}
|
||||
|
||||
sub_chunk_id = stream_read_uint32(qtmovie->stream);
|
||||
|
||||
switch (sub_chunk_id)
|
||||
{
|
||||
case MAKEFOURCC('t','k','h','d'):
|
||||
read_chunk_tkhd(qtmovie, sub_chunk_len);
|
||||
break;
|
||||
case MAKEFOURCC('m','d','i','a'):
|
||||
if (!read_chunk_mdia(qtmovie, sub_chunk_len)) {
|
||||
return false;
|
||||
}
|
||||
break;
|
||||
default:
|
||||
// fprintf(stderr, "(trak) unknown chunk id: %c%c%c%c\n",
|
||||
// SPLITFOURCC(sub_chunk_id));
|
||||
stream_skip(qtmovie->stream, sub_chunk_len - 8);
|
||||
break;
|
||||
}
|
||||
|
||||
size_remaining -= sub_chunk_len;
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
/* 'mvhd' movie header atom */
|
||||
static void read_chunk_mvhd(qtmovie_t *qtmovie, size_t chunk_len)
|
||||
{
|
||||
/* don't need anything from here atm, skip */
|
||||
size_t size_remaining = chunk_len - 8; /* FIXME WRONG */
|
||||
|
||||
stream_skip(qtmovie->stream, size_remaining);
|
||||
}
|
||||
|
||||
/* 'udta' user data.. contains tag info */
|
||||
static void read_chunk_udta(qtmovie_t *qtmovie, size_t chunk_len)
|
||||
{
|
||||
/* don't need anything from here atm, skip */
|
||||
size_t size_remaining = chunk_len - 8; /* FIXME WRONG */
|
||||
|
||||
stream_skip(qtmovie->stream, size_remaining);
|
||||
}
|
||||
|
||||
/* 'moov' movie atom - contains other atoms */
|
||||
static bool read_chunk_moov(qtmovie_t *qtmovie, size_t chunk_len)
|
||||
{
|
||||
size_t size_remaining = chunk_len - 8; /* FIXME WRONG */
|
||||
|
||||
while (size_remaining)
|
||||
{
|
||||
size_t sub_chunk_len;
|
||||
fourcc_t sub_chunk_id;
|
||||
|
||||
sub_chunk_len = stream_read_uint32(qtmovie->stream);
|
||||
if (sub_chunk_len <= 1 || sub_chunk_len > size_remaining)
|
||||
{
|
||||
//fprintf(stderr, "strange size for chunk inside moov\n");
|
||||
return false;
|
||||
}
|
||||
|
||||
sub_chunk_id = stream_read_uint32(qtmovie->stream);
|
||||
|
||||
switch (sub_chunk_id)
|
||||
{
|
||||
case MAKEFOURCC('m','v','h','d'):
|
||||
read_chunk_mvhd(qtmovie, sub_chunk_len);
|
||||
break;
|
||||
case MAKEFOURCC('t','r','a','k'):
|
||||
if (!read_chunk_trak(qtmovie, sub_chunk_len)) {
|
||||
return false;
|
||||
}
|
||||
break;
|
||||
case MAKEFOURCC('u','d','t','a'):
|
||||
read_chunk_udta(qtmovie, sub_chunk_len);
|
||||
break;
|
||||
default:
|
||||
// fprintf(stderr, "(moov) unknown chunk id: %c%c%c%c\n",
|
||||
// SPLITFOURCC(sub_chunk_id));
|
||||
return false;
|
||||
}
|
||||
|
||||
size_remaining -= sub_chunk_len;
|
||||
}
|
||||
return true;
|
||||
}
|
||||
|
||||
static void read_chunk_mdat(qtmovie_t *qtmovie, size_t chunk_len)
|
||||
{
|
||||
size_t size_remaining = chunk_len - 8; /* FIXME WRONG */
|
||||
|
||||
qtmovie->res->mdat_len = size_remaining;
|
||||
#if 0
|
||||
qtmovie->res->mdat = malloc(size_remaining);
|
||||
|
||||
stream_read(qtmovie->stream, size_remaining, qtmovie->res->mdat);
|
||||
#endif
|
||||
}
|
||||
|
||||
int qtmovie_read(stream_t *file, demux_res_t *demux_res)
|
||||
{
|
||||
qtmovie_t qtmovie;
|
||||
|
||||
/* construct the stream */
|
||||
qtmovie.stream = file;
|
||||
qtmovie.res = demux_res;
|
||||
|
||||
/* read the chunks */
|
||||
while (1)
|
||||
{
|
||||
size_t chunk_len;
|
||||
fourcc_t chunk_id;
|
||||
|
||||
chunk_len = stream_read_uint32(qtmovie.stream);
|
||||
if (stream_eof(qtmovie.stream))
|
||||
{
|
||||
return 0;
|
||||
}
|
||||
|
||||
if (chunk_len == 1)
|
||||
{
|
||||
//fprintf(stderr, "need 64bit support\n");
|
||||
return 0;
|
||||
}
|
||||
chunk_id = stream_read_uint32(qtmovie.stream);
|
||||
|
||||
switch (chunk_id)
|
||||
{
|
||||
case MAKEFOURCC('f','t','y','p'):
|
||||
read_chunk_ftyp(&qtmovie, chunk_len);
|
||||
break;
|
||||
case MAKEFOURCC('m','o','o','v'):
|
||||
if (!read_chunk_moov(&qtmovie, chunk_len)) {
|
||||
return 0;
|
||||
}
|
||||
break;
|
||||
/* once we hit mdat we stop reading and return.
|
||||
* this is on the assumption that there is no furhter interesting
|
||||
* stuff in the stream. if there is stuff will fail (:()).
|
||||
* But we need the read pointer to be at the mdat stuff
|
||||
* for the decoder. And we don't want to rely on fseek/ftell,
|
||||
* as they may not always be avilable */
|
||||
case MAKEFOURCC('m','d','a','t'):
|
||||
read_chunk_mdat(&qtmovie, chunk_len);
|
||||
/* Keep track of start of stream in file - used for seeking */
|
||||
qtmovie.res->mdat_offset=stream_tell(qtmovie.stream);
|
||||
return 1;
|
||||
|
||||
/* these following atoms can be skipped !!!! */
|
||||
case MAKEFOURCC('f','r','e','e'):
|
||||
stream_skip(qtmovie.stream, chunk_len - 8); /* FIXME not 8 */
|
||||
break;
|
||||
default:
|
||||
// fprintf(stderr, "(top) unknown chunk id: %c%c%c%c\n",
|
||||
// SPLITFOURCC(chunk_id));
|
||||
return 0;
|
||||
}
|
||||
|
||||
}
|
||||
return 0;
|
||||
}
|
||||
|
||||
|
||||
Loading…
Add table
Add a link
Reference in a new issue