[vlc-devel] [PATCH] libmp4: add TfrfBox and TfxdBox parsing
Frédéric Yhuel
fyhuel at viotech.net
Thu Mar 22 17:41:36 CET 2012
These are Smooth Streaming specific boxes, which provide duration and
time offset of subsequent(s) fragment(s), thus allowing us to avoid
manifest polling in "live" mode.
See the following file for reference:
http://download.microsoft.com/download/B/0/B/B0B199DB-41E6-400F-90CD-C350D0C14A53/%5BMS-SSTR%5D.pdf
---
modules/demux/mp4/libmp4.c | 113 ++++++++++++++++++++++++++++++++++++++++++++
modules/demux/mp4/libmp4.h | 30 ++++++++++++
2 files changed, 143 insertions(+), 0 deletions(-)
diff --git a/modules/demux/mp4/libmp4.c b/modules/demux/mp4/libmp4.c
index 13057ca..28de03c 100644
--- a/modules/demux/mp4/libmp4.c
+++ b/modules/demux/mp4/libmp4.c
@@ -139,6 +139,11 @@ static inline void GetUUID( UUID_t *p_uuid, const uint8_t *p_buff )
memcpy( p_uuid, p_buff, 16 );
}
+static inline int CmpUUID( const UUID_t *u1, const UUID_t *u2 )
+{
+ return memcmp( u1, u2, 16 );
+}
+
static void CreateUUID( UUID_t *p_uuid, uint32_t i_fourcc )
{
/* made by 0xXXXXXXXX-0011-0010-8000-00aa00389b71
@@ -148,6 +153,14 @@ static void CreateUUID( UUID_t *p_uuid, uint32_t i_fourcc )
(void)i_fourcc;
}
+const UUID_t TfrfBoxUUID = { .b =
+ { 0xd4, 0x80, 0x7e, 0xf2, 0xca, 0x39, 0x46, 0x95,
+ 0x8e, 0x54, 0x26, 0xcb, 0x9e, 0x46, 0xa7, 0x9f } };
+
+const UUID_t TfxdBoxUUID = { .b =
+ { 0x6d, 0x1d, 0x9b, 0x05, 0x42, 0xd5, 0x44, 0xe6,
+ 0x80, 0xe2, 0x14, 0x1b, 0xaf, 0xf7, 0x57, 0xb2 } };
+
/* convert 16.16 fixed point to floating point */
static double conv_fx( int32_t fx ) {
double fp = fx;
@@ -501,6 +514,105 @@ static int MP4_ReadBox_mfhd( stream_t *p_stream, MP4_Box_t *p_box )
MP4_READBOX_EXIT( 1 );
}
+static int MP4_ReadBox_tfxd( stream_t *p_stream, MP4_Box_t *p_box )
+{
+ MP4_READBOX_ENTER( MP4_Box_data_tfxd_t );
+
+ MP4_Box_data_tfxd_t *p_tfxd_data = p_box->data.p_tfxd;
+ MP4_GETVERSIONFLAGS( p_tfxd_data );
+
+ if( p_tfxd_data->i_version == 0 )
+ {
+ MP4_GET4BYTES( p_tfxd_data->i_fragment_abs_time );
+ MP4_GET4BYTES( p_tfxd_data->i_fragment_duration );
+ }
+ else
+ {
+ MP4_GET8BYTES( p_tfxd_data->i_fragment_abs_time );
+ MP4_GET8BYTES( p_tfxd_data->i_fragment_duration );
+ }
+
+#ifdef MP4_VERBOSE
+ msg_Dbg( p_stream, "read box: \"tfxd\" version %d, flags 0x%x, "\
+ "fragment duration %"PRIu64", fragment abs time %"PRIu64,
+ p_tfxd_data->i_version,
+ p_tfxd_data->i_flags,
+ p_tfxd_data->i_fragment_duration,
+ p_tfxd_data->i_fragment_abs_time
+ );
+#endif
+
+ MP4_READBOX_EXIT( 1 );
+}
+
+static int MP4_ReadBox_tfrf( stream_t *p_stream, MP4_Box_t *p_box )
+{
+ MP4_READBOX_ENTER( MP4_Box_data_tfxd_t );
+
+ MP4_Box_data_tfrf_t *p_tfrf_data = p_box->data.p_tfrf;
+ MP4_GETVERSIONFLAGS( p_tfrf_data );
+
+ MP4_GET1BYTE( p_tfrf_data->i_fragment_count );
+
+ p_tfrf_data->p_tfrf_data_fields = calloc( p_tfrf_data->i_fragment_count,
+ sizeof( TfrfBoxDataFields_t ) );
+ if( !p_tfrf_data->p_tfrf_data_fields )
+ MP4_READBOX_EXIT( 0 );
+
+ for( uint8_t i = 0; i < p_tfrf_data->i_fragment_count; i++ )
+ {
+ TfrfBoxDataFields_t *TfrfBoxDataField = &p_tfrf_data->p_tfrf_data_fields[i];
+ if( p_tfrf_data->i_version == 0 )
+ {
+ MP4_GET4BYTES( TfrfBoxDataField->i_fragment_abs_time );
+ MP4_GET4BYTES( TfrfBoxDataField->i_fragment_duration );
+ }
+ else
+ {
+ MP4_GET8BYTES( TfrfBoxDataField->i_fragment_abs_time );
+ MP4_GET8BYTES( TfrfBoxDataField->i_fragment_duration );
+ }
+ }
+
+#ifdef MP4_VERBOSE
+ msg_Dbg( p_stream, "read box: \"tfrf\" version %d, flags 0x%x, "\
+ "fragment count %"PRIu8", "\
+ "1st fragment duration %"PRIu64", 1st fragment abs time %"PRIu64,
+ p_tfrf_data->i_version,
+ p_tfrf_data->i_flags,
+ p_tfrf_data->i_fragment_count,
+ p_tfrf_data->p_tfrf_data_fields[0].i_fragment_duration,
+ p_tfrf_data->p_tfrf_data_fields[0].i_fragment_abs_time
+ );
+#endif
+
+ MP4_READBOX_EXIT( 1 );
+}
+
+static void MP4_FreeBox_tfrf( MP4_Box_t *p_box )
+{
+ FREENULL( p_box->data.p_tfrf->p_tfrf_data_fields );
+}
+
+static int MP4_ReadBox_uuid( stream_t *p_stream, MP4_Box_t *p_box )
+{
+ if( !CmpUUID( &p_box->i_uuid, &TfrfBoxUUID ) )
+ return MP4_ReadBox_tfrf( p_stream, p_box );
+ if( !CmpUUID( &p_box->i_uuid, &TfxdBoxUUID ) )
+ return MP4_ReadBox_tfxd( p_stream, p_box );
+
+ msg_Warn( p_stream, "Unknown uuid type box" );
+ return 1;
+}
+
+static void MP4_FreeBox_uuid( MP4_Box_t *p_box )
+{
+ if( !CmpUUID( &p_box->i_uuid, &TfrfBoxUUID ) )
+ return MP4_FreeBox_tfrf( p_box );
+ if( !CmpUUID( &p_box->i_uuid, &TfxdBoxUUID ) )
+ return MP4_FreeBox_Common( p_box );
+}
+
static int MP4_ReadBox_sidx( stream_t *p_stream, MP4_Box_t *p_box )
{
MP4_READBOX_ENTER( MP4_Box_data_sidx_t );
@@ -3290,6 +3402,7 @@ static const struct
{ ATOM_sdtp, MP4_ReadBox_sdtp, MP4_FreeBox_sdtp },
{ ATOM_tfra, MP4_ReadBox_tfra, MP4_FreeBox_tfra },
{ ATOM_mfro, MP4_ReadBox_mfro, MP4_FreeBox_Common },
+ { ATOM_uuid, MP4_ReadBox_uuid, MP4_FreeBox_uuid },
/* Last entry */
{ 0, MP4_ReadBox_default, NULL }
diff --git a/modules/demux/mp4/libmp4.h b/modules/demux/mp4/libmp4.h
index d548f9e..6f23833 100644
--- a/modules/demux/mp4/libmp4.h
+++ b/modules/demux/mp4/libmp4.h
@@ -260,6 +260,33 @@ typedef struct UUID_s
/* specific structure for all boxes */
+typedef struct MP4_Box_data_tfxd_s
+{
+ uint8_t i_version;
+ uint32_t i_flags;
+
+ uint64_t i_fragment_duration;
+ uint64_t i_fragment_abs_time;
+
+} MP4_Box_data_tfxd_t;
+
+typedef struct TfrfBoxDataFields_s
+{
+ uint64_t i_fragment_duration;
+ uint64_t i_fragment_abs_time;
+
+} TfrfBoxDataFields_t;
+
+typedef struct MP4_Box_data_tfrf_s
+{
+ uint8_t i_version;
+ uint32_t i_flags;
+
+ uint8_t i_fragment_count;
+ TfrfBoxDataFields_t *p_tfrf_data_fields;
+
+} MP4_Box_data_tfrf_t;
+
typedef struct MP4_Box_data_ftyp_s
{
uint32_t i_major_brand;
@@ -1156,6 +1183,9 @@ typedef union MP4_Box_data_s
MP4_Box_data_tref_generic_t *p_tref_generic;
MP4_Box_data_name_t *p_name;
+ MP4_Box_data_tfrf_t *p_tfrf;
+ MP4_Box_data_tfxd_t *p_tfxd;
+
void *p_data; /* for unknow type */
} MP4_Box_data_t;
--
1.7.5.4
More information about the vlc-devel
mailing list