[vlc-commits] Added 'pasp' atom support to mp4/mov demuxer.

[Laurent Aimar]

vlc | branch: master | Laurent Aimar <fenrir at videolan.org> | Thu Oct 27 00:07:47 2011 +0200| [6b49065d2c4ba3375fd5c4962a097e592f9d859d] | committer: Laurent Aimar

Added 'pasp' atom support to mp4/mov demuxer.

This atom can store an optionnal aspect ratio.

> http://git.videolan.org/gitweb.cgi/vlc.git/?a=commit;h=6b49065d2c4ba3375fd5c4962a097e592f9d859d
---

 modules/demux/mp4/libmp4.c |   18 ++++++++++++++++++
 modules/demux/mp4/libmp4.h |    8 ++++++++
 modules/demux/mp4/mp4.c    |    9 +++++++++
 3 files changed, 35 insertions(+), 0 deletions(-)

diff --git a/modules/demux/mp4/libmp4.c b/modules/demux/mp4/libmp4.c
index 35ebfee..d26da3d 100644
--- a/modules/demux/mp4/libmp4.c
+++ b/modules/demux/mp4/libmp4.c
@@ -2704,6 +2704,23 @@ static int MP4_ReadBox_iods( stream_t *p_stream, MP4_Box_t *p_box )
     MP4_READBOX_EXIT( 1 );
 }
 
+static int MP4_ReadBox_pasp( stream_t *p_stream, MP4_Box_t *p_box )
+{
+    MP4_READBOX_ENTER( MP4_Box_data_pasp_t );
+
+    MP4_GET4BYTES( p_box->data.p_pasp->i_horizontal_spacing );
+    MP4_GET4BYTES( p_box->data.p_pasp->i_vertical_spacing );
+
+#ifdef MP4_VERBOSE
+    msg_Dbg( p_stream,
+             "read box: \"paps\" %dx%d",
+             p_box->data.p_pasp->i_horizontal_spacing,
+             p_box->data.p_pasp->i_vertical_spacing);
+#endif
+
+    MP4_READBOX_EXIT( 1 );
+}
+
 
 /* For generic */
 static int MP4_ReadBox_default( stream_t *p_stream, MP4_Box_t *p_box )
@@ -2818,6 +2835,7 @@ static const struct
     { ATOM_gnre,    MP4_ReadBox_gnre,         MP4_FreeBox_Common },
     { ATOM_trkn,    MP4_ReadBox_trkn,         MP4_FreeBox_Common },
     { ATOM_iods,    MP4_ReadBox_iods,         MP4_FreeBox_Common },
+    { ATOM_pasp,    MP4_ReadBox_pasp,         MP4_FreeBox_Common },
 
     /* Nothing to do with this box */
     { ATOM_mdat,    MP4_ReadBoxSkip,          MP4_FreeBox_Common },
diff --git a/modules/demux/mp4/libmp4.h b/modules/demux/mp4/libmp4.h
index f9e89dc..c4d2c82 100644
--- a/modules/demux/mp4/libmp4.h
+++ b/modules/demux/mp4/libmp4.h
@@ -80,6 +80,7 @@
 #define ATOM_trun VLC_FOURCC( 't', 'r', 'u', 'n' )
 #define ATOM_cprt VLC_FOURCC( 'c', 'p', 'r', 't' )
 #define ATOM_iods VLC_FOURCC( 'i', 'o', 'd', 's' )
+#define ATOM_pasp VLC_FOURCC( 'p', 'a', 's', 'p' )
 
 #define ATOM_nmhd VLC_FOURCC( 'n', 'm', 'h', 'd' )
 #define ATOM_mp2v VLC_FOURCC( 'm', 'p', '2', 'v' )
@@ -981,6 +982,12 @@ typedef struct
 
 } MP4_Box_data_iods_t;
 
+typedef struct
+{
+    uint32_t i_horizontal_spacing;
+    uint32_t i_vertical_spacing;
+} MP4_Box_data_pasp_t;
+
 /*
 typedef struct MP4_Box_data__s
 {
@@ -1022,6 +1029,7 @@ typedef union MP4_Box_data_s
     MP4_Box_data_gnre_t *p_gnre;
     MP4_Box_data_trkn_t *p_trkn;
     MP4_Box_data_iods_t *p_iods;
+    MP4_Box_data_pasp_t *p_pasp;
 
     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 c04e400..4ef7b76 100644
--- a/modules/demux/mp4/mp4.c
+++ b/modules/demux/mp4/mp4.c
@@ -1506,6 +1506,7 @@ static int TrackCreateES( demux_t *p_demux, mp4_track_t *p_track,
     MP4_Box_t   *p_esds;
     MP4_Box_t   *p_frma;
     MP4_Box_t   *p_enda;
+    MP4_Box_t   *p_pasp;
 
     if( pp_es )
         *pp_es = NULL;
@@ -1541,6 +1542,8 @@ static int TrackCreateES( demux_t *p_demux, mp4_track_t *p_track,
     if( !p_enda )
         p_enda = MP4_BoxGet( p_sample, "enda" );
 
+    p_pasp = MP4_BoxGet( p_sample, "pasp" );
+
     if( p_track->fmt.i_cat == AUDIO_ES && ( p_track->i_sample_size == 1 || p_track->i_sample_size == 2 ) )
     {
         MP4_Box_data_sample_soun_t *p_soun;
@@ -1640,6 +1643,12 @@ static int TrackCreateES( demux_t *p_demux, mp4_track_t *p_track,
             p_track->fmt.video.i_sar_num = p_track->i_width  * p_track->fmt.video.i_height;
             p_track->fmt.video.i_sar_den = p_track->i_height * p_track->fmt.video.i_width;
         }
+        if( p_pasp && p_pasp->data.p_pasp->i_horizontal_spacing > 0 &&
+                      p_pasp->data.p_pasp->i_vertical_spacing > 0 )
+        {
+            p_track->fmt.video.i_sar_num = p_pasp->data.p_pasp->i_horizontal_spacing;
+            p_track->fmt.video.i_sar_den = p_pasp->data.p_pasp->i_vertical_spacing;
+        }
 
         /* Support for cropping (eg. in H263 files) */
         p_track->fmt.video.i_visible_width = p_track->fmt.video.i_width;