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Codecs: mp4: Skip FOURCC filetype chunk check

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Instead of FOURCC it needs ignore-case text match. Also value can contain \0 ('m4a\0' instead of expected 'm4a ').But let's simply skip it and let decoder handle it.

Change-Id: I87eefcabbc9010481286257c26cee09e61d1221c
This commit is contained in:
roman.artiukhin 2023-08-31 02:09:40 +03:00 • committed by Solomon Peachy
parent fee5013514
commit d05f6aac2d
2 changed files with 8 additions and 32 deletions
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17
lib/rbcodec/codecs/libm4a/demux.c
View file

@ -56,22 +56,13 @@ typedef struct
/* chunk handlers */
static void read_chunk_ftyp(qtmovie_t *qtmovie, size_t chunk_len)
{
fourcc_t type;
size_t size_remaining = chunk_len - 8;
type = stream_read_uint32(qtmovie->stream);
// filetype (supported ignore case values: m4a, m4b, mp42, 3gp6, qt, isom)
char filetype[4];
stream_read(qtmovie->stream, 4, filetype);
size_remaining-=4;
if ((type != MAKEFOURCC('M','4','A',' ')) &&
(type != MAKEFOURCC('m','4','a',' ')) &&
(type != MAKEFOURCC('M','4','B',' ')) &&
(type != MAKEFOURCC('m','p','4','2')) &&
(type != MAKEFOURCC('3','g','p','6')) &&
(type != MAKEFOURCC('q','t',' ',' ')) &&
(type != MAKEFOURCC('i','s','o','m')))
{
DEBUGF("not M4A file\n");
return;
}
/* minor_ver = */ stream_read_uint32(qtmovie->stream);
size_remaining-=4;

23
lib/rbcodec/metadata/mp4.c
View file

@ -57,10 +57,6 @@
#define MP4_gnre FOURCC('g', 'n', 'r', 'e')
#define MP4_hdlr FOURCC('h', 'd', 'l', 'r')
#define MP4_ilst FOURCC('i', 'l', 's', 't')
#define MP4_isom FOURCC('i', 's', 'o', 'm')
#define MP4_M4A FOURCC('M', '4', 'A', ' ')
#define MP4_m4a FOURCC('m', '4', 'a', ' ') /*technically its "M4A "*/
#define MP4_M4B FOURCC('M', '4', 'B', ' ') /*but files exist with lower case*/
#define MP4_mdat FOURCC('m', 'd', 'a', 't')
#define MP4_mdia FOURCC('m', 'd', 'i', 'a')
#define MP4_mdir FOURCC('m', 'd', 'i', 'r')
@ -68,8 +64,6 @@
#define MP4_minf FOURCC('m', 'i', 'n', 'f')
#define MP4_moov FOURCC('m', 'o', 'o', 'v')
#define MP4_mp4a FOURCC('m', 'p', '4', 'a')
#define MP4_mp42 FOURCC('m', 'p', '4', '2')
#define MP4_qt FOURCC('q', 't', ' ', ' ')
#define MP4_soun FOURCC('s', 'o', 'u', 'n')
#define MP4_stbl FOURCC('s', 't', 'b', 'l')
#define MP4_stsd FOURCC('s', 't', 's', 'd')
@ -618,20 +612,11 @@ static bool read_mp4_container(int fd, struct mp3entry* id3,
{
case MP4_ftyp:
{
uint32_t id;
read_uint32be(fd, &id);
// filetype (supported ignore case values: m4a, m4b, mp42, 3gp6, qt, isom)
char filetype[4];
read(fd, &filetype, 4);
DEBUGF("MP4 file type: '%.4s'\n", filetype);
size -= 4;
if ((id != MP4_M4A) && (id != MP4_M4B) && (id != MP4_mp42)
&& (id != MP4_qt) && (id != MP4_3gp6) && (id != MP4_m4a)
&& (id != MP4_isom))
{
DEBUGF("Unknown MP4 file type: '%c%c%c%c'\n",
(int)(id >> 24 & 0xff), (int)(id >> 16 & 0xff),
(int)(id >> 8 & 0xff), (int)(id & 0xff));
return false;
}
}
break;