*/
/**
- * @file flac.h
+ * @file
* FLAC (Free Lossless Audio Codec) decoder/demuxer common functions
*/
#include "avcodec.h"
+#define FLAC_STREAMINFO_SIZE 34
+#define FLAC_MAX_CHANNELS 8
+#define FLAC_MIN_BLOCKSIZE 16
+#define FLAC_MAX_BLOCKSIZE 65535
+
+enum {
+ FLAC_CHMODE_INDEPENDENT = 0,
+ FLAC_CHMODE_LEFT_SIDE = 8,
+ FLAC_CHMODE_RIGHT_SIDE = 9,
+ FLAC_CHMODE_MID_SIDE = 10,
+};
+
+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 */
+} FLACFrameInfo;
+
/**
* Parse the Streaminfo metadata block
* @param[out] avctx codec context to set basic stream parameters
void 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,
+ 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
+ * @param ch number of channels
+ * @param bps bits-per-sample
+ */
+int ff_flac_get_max_frame_size(int blocksize, int ch, int bps);
+
#endif /* AVCODEC_FLAC_H */