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+/*
+ * FLAC (Free Lossless Audio Codec) decoder/parser common functions
+ * Copyright (c) 2008 Justin Ruggles
+ *
+ * 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
+ */
+
+/**
+ * @file
+ * FLAC (Free Lossless Audio Codec) decoder/parser common functions
+ */
+
+#ifndef AVCODEC_FLAC_PARSE_H
+#define AVCODEC_FLAC_PARSE_H
+
+#include "avcodec.h"
+#include "get_bits.h"
+
+typedef struct FLACStreaminfo {
+ int samplerate; /**< sample rate */
+ int channels; /**< number of channels */
+ int bps; /**< bits-per-sample */
+ int max_blocksize; /**< maximum block size, in samples */
+ int max_framesize; /**< maximum frame size, in bytes */
+ int64_t samples; /**< total number of samples */
+} FLACStreaminfo;
+
+typedef struct FLACFrameInfo {
+ int samplerate; /**< sample rate */
+ int channels; /**< number of channels */
+ int bps; /**< bits-per-sample */
+ int blocksize; /**< block size of the frame */
+ int ch_mode; /**< channel decorrelation mode */
+ int64_t frame_or_sample_num; /**< frame number or sample number */
+ int is_var_size; /**< specifies if the stream uses variable
+ block sizes or a fixed block size;
+ also determines the meaning of
+ frame_or_sample_num */
+} FLACFrameInfo;
+
+/**
+ * Parse the Streaminfo metadata block
+ * @param[out] avctx codec context to set basic stream parameters
+ * @param[out] s where parsed information is stored
+ * @param[in] buffer pointer to start of 34-byte streaminfo data
+ *
+ * @return negative error code on faiure or >= 0 on success
+ */
+int ff_flac_parse_streaminfo(AVCodecContext *avctx, struct FLACStreaminfo *s,
+ const uint8_t *buffer);
+
+/**
+ * Validate the FLAC extradata.
+ * @param[in] avctx codec context containing the extradata.
+ * @param[out] format extradata format.
+ * @param[out] streaminfo_start pointer to start of 34-byte STREAMINFO data.
+ * @return 1 if valid, 0 if not valid.
+ */
+int ff_flac_is_extradata_valid(AVCodecContext *avctx,
+ uint8_t **streaminfo_start);
+
+/**
+ * Validate and decode a frame header.
+ * @param logctx context for logging
+ * @param gb GetBitContext from which to read frame header
+ * @param[out] fi frame information
+ * @param log_level_offset log level offset. can be used to silence error messages.
+ * @return non-zero on error, 0 if ok
+ */
+int ff_flac_decode_frame_header(void *logctx, GetBitContext *gb,
+ FLACFrameInfo *fi, int log_level_offset);
+
+void ff_flac_set_channel_layout(AVCodecContext *avctx, int channels);
+
+#endif /* AVCODEC_FLAC_PARSE_H */