mpeg4audio common code

Originally committed as revision 12662 to svn://svn.ffmpeg.org/ffmpeg/trunk

1 files changed, 49 insertions, 0 deletions

diff --git a/libavcodec/mpeg4audio.h b/libavcodec/mpeg4audio.h
new file mode 100644
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+++ b/libavcodec/mpeg4audio.h
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+/*
+ * MPEG-4 Audio common header
+ * Copyright (c) 2008 Baptiste Coudurier <baptiste.coudurier@free.fr>
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg 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
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef FFMPEG_MPEG4AUDIO_H
+#define FFMPEG_MPEG4AUDIO_H
+
+#include <stdint.h>
+
+typedef struct {
+    int object_type;
+    int sampling_index;
+    int sample_rate;
+    int chan_config;
+    int sbr; //< -1 implicit, 1 presence
+    int ext_object_type;
+    int ext_sampling_index;
+    int ext_sample_rate;
+} MPEG4AudioConfig;
+
+extern const int ff_mpeg4audio_sample_rates[16];
+extern const uint8_t ff_mpeg4audio_channels[8];
+/**
+ * Parse MPEG-4 systems extradata to retrieve audio configuration.
+ * @param[in] c        MPEG4AudioConfig structure to fill.
+ * @param[in] buf      Extradata from container.
+ * @param[in] buf_size Extradata size.
+ * @return On error -1 is returned, on success AudioSpecificConfig bit index in extradata.
+ */
+int ff_mpeg4audio_get_config(MPEG4AudioConfig *c, const uint8_t *buf, int buf_size);
+
+#endif /* FFMPEG_MPEGAUDIO_H */