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qtmux: Write 'btrt' atom for H.264 media if possible

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This writes out the optional 'btrt' atom (MPEG4BitrateBox) for H.264
media if either or both of average and maximum bitrate are available for
the stream.

https://bugzilla.gnome.org/show_bug.cgi?id=623678
This commit is contained in:
Arun Raghavan 2010-07-06 14:48:08 +05:30 committed by Thiago Santos
parent 827e401e3a
commit c28613d8db
3 changed files with 29 additions and 0 deletions
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24
gst/qtmux/atoms.c
View file

@ -3124,6 +3124,30 @@ build_esds_extension (AtomTRAK * trak, guint8 object_type, guint8 stream_type,
atom_esds_free);
}
AtomInfo *
build_btrt_extension (guint32 buffer_size_db, guint32 avg_bitrate,
guint32 max_bitrate)
{
AtomData *atom_data;
GstBuffer *buf;
if (buffer_size_db == 0 && avg_bitrate == 0 && max_bitrate == 0)
return 0;
buf = gst_buffer_new_and_alloc (12);
GST_WRITE_UINT32_BE (GST_BUFFER_DATA (buf), buffer_size_db);
GST_WRITE_UINT32_BE (GST_BUFFER_DATA (buf) + 4, avg_bitrate);
GST_WRITE_UINT32_BE (GST_BUFFER_DATA (buf) + 8, max_bitrate);
atom_data =
atom_data_new_from_gst_buffer (GST_MAKE_FOURCC ('b', 't', 'r', 't'), buf);
gst_buffer_unref (buf);
return build_atom_info_wrapper ((Atom *) atom_data, atom_data_copy_data,
atom_data_free);
}
static AtomInfo *
build_mov_wave_extension (AtomTRAK * trak, guint32 fourcc, AtomInfo * atom1,
AtomInfo * atom2, gboolean terminator)

2
gst/qtmux/atoms.h
View file

@ -726,6 +726,8 @@ AtomInfo * build_mov_alac_extension (AtomTRAK * trak, const GstBuffer * cod
AtomInfo * build_esds_extension (AtomTRAK * trak, guint8 object_type,
guint8 stream_type, const GstBuffer * codec_data,
guint32 avg_bitrate, guint32 max_bitrate);
AtomInfo * build_btrt_extension (guint32 buffer_size_db, guint32 avg_bitrate,
guint32 max_bitrate);
AtomInfo * build_jp2h_extension (AtomTRAK * trak, gint width, gint height,
guint32 fourcc, gint ncomp,
const GValue * cmap_array,

3
gst/qtmux/gstqtmux.c
View file

@ -2318,6 +2318,9 @@ gst_qt_mux_video_sink_set_caps (GstPad * pad, GstCaps * caps)
} else if (strcmp (mimetype, "video/x-h264") == 0) {
entry.fourcc = FOURCC_avc1;
qtpad->is_out_of_order = TRUE;
ext_atom = build_btrt_extension (0, qtpad->avg_bitrate, qtpad->max_bitrate);
if (ext_atom != NULL)
ext_atom_list = g_list_prepend (ext_atom_list, ext_atom);
if (!codec_data)
GST_WARNING_OBJECT (qtmux, "no codec_data in h264 caps");
ext_atom = build_codec_data_extension (FOURCC_avcC, codec_data);