* 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 libavcodec/flac.h
+ * @file
* FLAC (Free Lossless Audio Codec) decoder/demuxer common functions
*/
#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 = 8,
- FLAC_CHMODE_RIGHT_SIDE = 9,
- FLAC_CHMODE_MID_SIDE = 10,
+ FLAC_CHMODE_INDEPENDENT = 0,
+ FLAC_CHMODE_LEFT_SIDE = 1,
+ FLAC_CHMODE_RIGHT_SIDE = 2,
+ FLAC_CHMODE_MID_SIDE = 3,
};
enum {
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;
/**
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.
enum FLACExtradataFormat *format,
uint8_t **streaminfo_start);
-/**
- * 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
- */
-void ff_flac_parse_block_header(const uint8_t *block_header,
- int *last, int *type, int *size);
-
/**
* Calculate an estimate for the maximum frame size based on verbatim mode.
* @param blocksize block size, in samples
*/
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 /* AVCODEC_FLAC_H */