mirror of
https://gitlab.freedesktop.org/gstreamer/gstreamer.git
synced 2024-12-15 04:46:32 +00:00
93 lines
2.5 KiB
C
93 lines
2.5 KiB
C
/* GStreamer Opus Encoder
|
|
* Copyright (C) <1999> Erik Walthinsen <omega@cse.ogi.edu>
|
|
* Copyright (C) <2008> Sebastian Dröge <sebastian.droege@collabora.co.uk>
|
|
* Copyright (C) <2011> Vincent Penquerc'h <vincent.penquerch@collabora.co.uk>
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Library General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Library General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Library General Public
|
|
* License along with this library; if not, write to the
|
|
* Free Software Foundation, Inc., 51 Franklin St, Fifth Floor,
|
|
* Boston, MA 02110-1301, USA.
|
|
*/
|
|
|
|
#ifdef HAVE_CONFIG_H
|
|
#include "config.h"
|
|
#endif
|
|
#include <gst/tag/tag.h>
|
|
#include <gst/base/gstbytewriter.h>
|
|
#include "gstopusheader.h"
|
|
|
|
gboolean
|
|
gst_opus_header_is_header (GstBuffer * buf, const char *magic, guint magic_size)
|
|
{
|
|
return (gst_buffer_get_size (buf) >= magic_size
|
|
&& !gst_buffer_memcmp (buf, 0, magic, magic_size));
|
|
}
|
|
|
|
gboolean
|
|
gst_opus_header_is_id_header (GstBuffer * buf)
|
|
{
|
|
gsize size = gst_buffer_get_size (buf);
|
|
guint8 *data = NULL;
|
|
guint8 version, channels, channel_mapping_family, n_streams, n_stereo_streams;
|
|
gboolean ret = FALSE;
|
|
GstMapInfo map;
|
|
|
|
if (size < 19)
|
|
goto beach;
|
|
if (!gst_opus_header_is_header (buf, "OpusHead", 8))
|
|
goto beach;
|
|
|
|
gst_buffer_map (buf, &map, GST_MAP_READ);
|
|
data = map.data;
|
|
size = map.size;
|
|
|
|
version = data[8];
|
|
if (version >= 0x0f) /* major version >=0 is what we grok */
|
|
goto beach;
|
|
|
|
channels = data[9];
|
|
|
|
if (channels == 0)
|
|
goto beach;
|
|
|
|
channel_mapping_family = data[18];
|
|
|
|
if (channel_mapping_family == 0) {
|
|
if (channels > 2)
|
|
goto beach;
|
|
} else {
|
|
channels = data[9];
|
|
if (size < 21 + channels)
|
|
goto beach;
|
|
n_streams = data[19];
|
|
n_stereo_streams = data[20];
|
|
if (n_streams == 0)
|
|
goto beach;
|
|
if (n_stereo_streams > n_streams)
|
|
goto beach;
|
|
if (n_streams + n_stereo_streams > 255)
|
|
goto beach;
|
|
}
|
|
ret = TRUE;
|
|
|
|
beach:
|
|
if (data)
|
|
gst_buffer_unmap (buf, &map);
|
|
return ret;
|
|
}
|
|
|
|
gboolean
|
|
gst_opus_header_is_comment_header (GstBuffer * buf)
|
|
{
|
|
return gst_opus_header_is_header (buf, "OpusTags", 8);
|
|
}
|