[vlc-devel] [PATCH] demux/mp4: add support of some atoms
F. Yhuel
fyhuel at viotech.net
Thu Nov 24 11:47:47 CET 2011
Atoms mvex, mehd, trex and sdtp are found at least in PIFF files. This a
first step towards Smooth Streaming support in VLC.
---
modules/demux/mp4/libmp4.c | 76 ++++++++++++++++++++++++++++++++++++++++++++
modules/demux/mp4/libmp4.h | 33 +++++++++++++++++++
modules/demux/mp4/mp4.c | 3 ++
3 files changed, 112 insertions(+), 0 deletions(-)
diff --git a/modules/demux/mp4/libmp4.c b/modules/demux/mp4/libmp4.c
index d26da3d..7db18a6 100644
--- a/modules/demux/mp4/libmp4.c
+++ b/modules/demux/mp4/libmp4.c
@@ -2721,6 +2721,78 @@ static int MP4_ReadBox_pasp( stream_t *p_stream, MP4_Box_t *p_box )
MP4_READBOX_EXIT( 1 );
}
+static int MP4_ReadBox_mehd( stream_t *p_stream, MP4_Box_t *p_box )
+{
+ MP4_READBOX_ENTER( MP4_Box_data_mehd_t );
+
+ MP4_GETVERSIONFLAGS( p_box->data.p_mehd );
+ MP4_GET8BYTES( p_box->data.p_mehd->i_fragment_duration );
+
+#ifdef MP4_VERBOSE
+ msg_Dbg( p_stream,
+ "read box: \"mehd\" frag dur. %"PRIu64"",
+ p_box->data.p_mehd->i_fragment_duration);
+#endif
+
+ MP4_READBOX_EXIT( 1 );
+}
+
+static int MP4_ReadBox_trex( stream_t *p_stream, MP4_Box_t *p_box )
+{
+ MP4_READBOX_ENTER( MP4_Box_data_trex_t );
+ MP4_GETVERSIONFLAGS( p_box->data.p_trex );
+
+ MP4_GET4BYTES( p_box->data.p_trex->i_track_ID );
+ MP4_GET4BYTES( p_box->data.p_trex->i_default_sample_description_index );
+ MP4_GET4BYTES( p_box->data.p_trex->i_default_sample_duration );
+ MP4_GET4BYTES( p_box->data.p_trex->i_default_sample_size );
+ MP4_GET4BYTES( p_box->data.p_trex->i_default_sample_flags );
+
+#ifdef MP4_VERBOSE
+ msg_Dbg( p_stream,
+ "read box: \"trex\" trackID: %"PRIu32"",
+ p_box->data.p_trex->i_track_ID);
+#endif
+
+ MP4_READBOX_EXIT( 1 );
+}
+
+static int MP4_ReadBox_sdtp( stream_t *p_stream, MP4_Box_t *p_box )
+{
+ uint32_t i_sample_count;
+ MP4_READBOX_ENTER( MP4_Box_data_sdtp_t );
+ MP4_Box_data_sdtp_t *p_sdtp = p_box->data.p_sdtp;
+ MP4_GETVERSIONFLAGS( p_box->data.p_sdtp );
+ i_sample_count = i_read;
+
+ p_sdtp->p_sample_table = calloc(i_sample_count, 1);
+
+ if( !p_sdtp->p_sample_table )
+ goto error;
+
+ for( uint32_t i=0; i < i_sample_count; i++ )
+ MP4_GET1BYTE( p_sdtp->p_sample_table[i] );
+
+#ifdef MP4_VERBOSE
+ msg_Info(p_stream, "i_sample_count is %"PRIu32"", i_sample_count);
+ msg_Dbg( p_stream,
+ "read box: \"sdtp\" head: %"PRIx8" %"PRIx8" %"PRIx8" %"PRIx8"",
+ p_sdtp->p_sample_table[0],
+ p_sdtp->p_sample_table[1],
+ p_sdtp->p_sample_table[2],
+ p_sdtp->p_sample_table[3]);
+#endif
+
+ MP4_READBOX_EXIT( 1 );
+error:
+ MP4_READBOX_EXIT( 0 );
+}
+
+static void MP4_FreeBox_sdtp( MP4_Box_t *p_box )
+{
+ FREENULL( p_box->data.p_sdtp->p_sample_table );
+}
+
/* For generic */
static int MP4_ReadBox_default( stream_t *p_stream, MP4_Box_t *p_box )
@@ -2799,6 +2871,7 @@ static const struct
{ ATOM_gmhd, MP4_ReadBoxContainer, MP4_FreeBox_Common },
{ ATOM_wave, MP4_ReadBoxContainer, MP4_FreeBox_Common },
{ ATOM_ilst, MP4_ReadBoxContainer, MP4_FreeBox_Common },
+ { ATOM_mvex, MP4_ReadBoxContainer, MP4_FreeBox_Common },
/* specific box */
{ ATOM_ftyp, MP4_ReadBox_ftyp, MP4_FreeBox_ftyp },
@@ -2986,6 +3059,9 @@ static const struct
{ ATOM_mfhd, MP4_ReadBox_mfhd, MP4_FreeBox_Common },
{ ATOM_tfhd, MP4_ReadBox_tfhd, MP4_FreeBox_Common },
{ ATOM_trun, MP4_ReadBox_trun, MP4_FreeBox_trun },
+ { ATOM_trex, MP4_ReadBox_trex, MP4_FreeBox_Common },
+ { ATOM_mehd, MP4_ReadBox_mehd, MP4_FreeBox_Common },
+ { ATOM_sdtp, MP4_ReadBox_sdtp, MP4_FreeBox_sdtp },
/* Last entry */
{ 0, MP4_ReadBox_default, NULL }
diff --git a/modules/demux/mp4/libmp4.h b/modules/demux/mp4/libmp4.h
index c4d2c82..3b9f18b 100644
--- a/modules/demux/mp4/libmp4.h
+++ b/modules/demux/mp4/libmp4.h
@@ -73,7 +73,9 @@
#define ATOM_edts VLC_FOURCC( 'e', 'd', 't', 's' )
#define ATOM_elst VLC_FOURCC( 'e', 'l', 's', 't' )
#define ATOM_mvex VLC_FOURCC( 'm', 'v', 'e', 'x' )
+#define ATOM_sdtp VLC_FOURCC( 's', 'd', 't', 'p' )
#define ATOM_trex VLC_FOURCC( 't', 'r', 'e', 'x' )
+#define ATOM_mehd VLC_FOURCC( 'm', 'e', 'h', 'd' )
#define ATOM_mfhd VLC_FOURCC( 'm', 'f', 'h', 'd' )
#define ATOM_traf VLC_FOURCC( 't', 'r', 'a', 'f' )
#define ATOM_tfhd VLC_FOURCC( 't', 'f', 'h', 'd' )
@@ -988,6 +990,34 @@ typedef struct
uint32_t i_vertical_spacing;
} MP4_Box_data_pasp_t;
+typedef struct
+{
+ uint8_t i_version;
+ uint32_t i_flags;
+
+ uint64_t i_fragment_duration;
+} MP4_Box_data_mehd_t;
+
+typedef struct
+{
+ uint8_t i_version;
+ uint32_t i_flags;
+
+ uint32_t i_track_ID;
+ uint32_t i_default_sample_description_index;
+ uint32_t i_default_sample_duration;
+ uint32_t i_default_sample_size;
+ uint32_t i_default_sample_flags;
+} MP4_Box_data_trex_t;
+
+typedef struct
+{
+ uint8_t i_version;
+ uint32_t i_flags;
+
+ uint8_t *p_sample_table;
+} MP4_Box_data_sdtp_t;
+
/*
typedef struct MP4_Box_data__s
{
@@ -1030,6 +1060,9 @@ typedef union MP4_Box_data_s
MP4_Box_data_trkn_t *p_trkn;
MP4_Box_data_iods_t *p_iods;
MP4_Box_data_pasp_t *p_pasp;
+ MP4_Box_data_trex_t *p_trex;
+ MP4_Box_data_mehd_t *p_mehd;
+ MP4_Box_data_sdtp_t *p_sdtp;
MP4_Box_data_stsz_t *p_stsz;
MP4_Box_data_stz2_t *p_stz2;
diff --git a/modules/demux/mp4/mp4.c b/modules/demux/mp4/mp4.c
index 9561d0f..ee26870 100644
--- a/modules/demux/mp4/mp4.c
+++ b/modules/demux/mp4/mp4.c
@@ -346,6 +346,9 @@ static int Open( vlc_object_t * p_this )
case( VLC_FOURCC( 'q', 't', ' ', ' ') ):
msg_Dbg( p_demux, "Apple QuickTime file" );
break;
+ case( VLC_FOURCC( 'i', 's', 'm', 'l') ):
+ msg_Dbg( p_demux, "PIFF (= isml = fMP4) file" );
+ break;
default:
msg_Dbg( p_demux,
"unrecognized major file specification (%4.4s).",
--
1.7.4.1
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