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