* FLAC (Free Lossless Audio Codec) decoder/demuxer common functions
* Copyright (c) 2008 Justin Ruggles
*
- * This file is part of FFmpeg.
+ * This file is part of Libav.
*
- * FFmpeg is free software; you can redistribute it and/or
+ * Libav 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,
+ * Libav 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
+ * License along with Libav; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
/**
- * @file flac.h
+ * @file
* FLAC (Free Lossless Audio Codec) decoder/demuxer common functions
*/
-#ifndef FFMPEG_FLAC_H
-#define FFMPEG_FLAC_H
+#ifndef AVCODEC_FLAC_H
+#define AVCODEC_FLAC_H
+
+#include "avcodec.h"
+#include "bytestream.h"
+#include "get_bits.h"
+
+#define FLAC_STREAMINFO_SIZE 34
+#define FLAC_MAX_CHANNELS 8
+#define FLAC_MIN_BLOCKSIZE 16
+#define FLAC_MAX_BLOCKSIZE 65535
+#define FLAC_MIN_FRAME_SIZE 11
+
+enum {
+ FLAC_CHMODE_INDEPENDENT = 0,
+ FLAC_CHMODE_LEFT_SIDE = 1,
+ FLAC_CHMODE_RIGHT_SIDE = 2,
+ FLAC_CHMODE_MID_SIDE = 3,
+};
+
+enum {
+ FLAC_METADATA_TYPE_STREAMINFO = 0,
+ FLAC_METADATA_TYPE_PADDING,
+ FLAC_METADATA_TYPE_APPLICATION,
+ FLAC_METADATA_TYPE_SEEKTABLE,
+ FLAC_METADATA_TYPE_VORBIS_COMMENT,
+ FLAC_METADATA_TYPE_CUESHEET,
+ FLAC_METADATA_TYPE_PICTURE,
+ FLAC_METADATA_TYPE_INVALID = 127
+};
+
+enum FLACExtradataFormat {
+ FLAC_EXTRADATA_FORMAT_STREAMINFO = 0,
+ FLAC_EXTRADATA_FORMAT_FULL_HEADER = 1
+};
+
+#define FLACCOMMONINFO \
+ int samplerate; /**< sample rate */\
+ int channels; /**< number of channels */\
+ int bps; /**< bits-per-sample */\
/**
* Data needed from the Streaminfo header for use by the raw FLAC demuxer
* and/or the FLAC decoder.
*/
#define FLACSTREAMINFO \
- int min_blocksize; /**< minimum block size, in samples */\
+ FLACCOMMONINFO \
int max_blocksize; /**< maximum block size, in samples */\
int max_framesize; /**< maximum frame size, in bytes */\
- int samplerate; /**< sample rate */\
- int channels; /**< number of channels */\
- int bps; /**< bits-per-sample */\
+ int64_t samples; /**< total number of samples */\
+
+typedef struct FLACStreaminfo {
+ FLACSTREAMINFO
+} FLACStreaminfo;
+
+typedef struct FLACFrameInfo {
+ FLACCOMMONINFO
+ 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
+ */
+void ff_flac_parse_streaminfo(AVCodecContext *avctx, struct FLACStreaminfo *s,
+ const uint8_t *buffer);
+
+#if LIBAVCODEC_VERSION_MAJOR < 57
+void avpriv_flac_parse_streaminfo(AVCodecContext *avctx, struct FLACStreaminfo *s,
+ const uint8_t *buffer);
+int avpriv_flac_is_extradata_valid(AVCodecContext *avctx,
+ enum FLACExtradataFormat *format,
+ uint8_t **streaminfo_start);
+#endif
+
+/**
+ * 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,
+ enum FLACExtradataFormat *format,
+ uint8_t **streaminfo_start);
+
+/**
+ * Calculate an estimate for the maximum frame size based on verbatim mode.
+ * @param blocksize block size, in samples
+ * @param ch number of channels
+ * @param bps bits-per-sample
+ */
+int ff_flac_get_max_frame_size(int blocksize, int ch, int bps);
+
+/**
+ * Validate and decode a frame header.
+ * @param avctx AVCodecContext to use as av_log() context
+ * @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(AVCodecContext *avctx, GetBitContext *gb,
+ FLACFrameInfo *fi, int log_level_offset);
+
+void ff_flac_set_channel_layout(AVCodecContext *avctx);
+
+/**
+ * Parse the metadata block parameters from the header.
+ * @param[in] block_header header data, at least 4 bytes
+ * @param[out] last indicator for last metadata block
+ * @param[out] type metadata block type
+ * @param[out] size metadata block size
+ */
+static av_always_inline void flac_parse_block_header(const uint8_t *block_header,
+ int *last, int *type, int *size)
+{
+ int tmp = bytestream_get_byte(&block_header);
+ if (last)
+ *last = tmp & 0x80;
+ if (type)
+ *type = tmp & 0x7F;
+ if (size)
+ *size = bytestream_get_be24(&block_header);
+}
-#endif /* FFMPEG_FLAC_H */
+#endif /* AVCODEC_FLAC_H */
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