/*
- * Common code between AC3 encoder and decoder
+ * Common code between the AC-3 encoder and decoder
* Copyright (c) 2000, 2001, 2002 Fabrice Bellard.
*
* This file is part of FFmpeg.
/**
* @file ac3.h
- * Common code between AC3 encoder and decoder.
+ * Common code between the AC-3 encoder and decoder.
*/
+#ifndef FFMPEG_AC3_H
+#define FFMPEG_AC3_H
+
+#include "ac3tab.h"
+
#define AC3_MAX_CODED_FRAME_SIZE 3840 /* in bytes */
#define AC3_MAX_CHANNELS 6 /* including LFE channel */
-#define NB_BLOCKS 6 /* number of PCM blocks inside an AC3 frame */
+#define NB_BLOCKS 6 /* number of PCM blocks inside an AC-3 frame */
#define AC3_FRAME_SIZE (NB_BLOCKS * 256)
/* exponent encoding strategy */
#define EXP_D25 2
#define EXP_D45 3
+/** Delta bit allocation strategy */
+typedef enum {
+ DBA_REUSE = 0,
+ DBA_NEW,
+ DBA_NONE,
+ DBA_RESERVED
+} AC3DeltaStrategy;
+
+/** Channel mode (audio coding mode) */
+typedef enum {
+ AC3_CHMODE_DUALMONO = 0,
+ AC3_CHMODE_MONO,
+ AC3_CHMODE_STEREO,
+ AC3_CHMODE_3F,
+ AC3_CHMODE_2F1R,
+ AC3_CHMODE_3F1R,
+ AC3_CHMODE_2F2R,
+ AC3_CHMODE_3F2R
+} AC3ChannelMode;
+
typedef struct AC3BitAllocParameters {
- int fscod; /* frequency */
- int halfratecod;
- int sgain, sdecay, fdecay, dbknee, floor;
- int cplfleak, cplsleak;
+ int sr_code;
+ int sr_shift;
+ int slow_gain, slow_decay, fast_decay, db_per_bit, floor;
+ int cpl_fast_leak, cpl_slow_leak;
} AC3BitAllocParameters;
/**
*/
uint16_t sync_word;
uint16_t crc1;
- uint8_t fscod;
- uint8_t frmsizecod;
- uint8_t bsid;
- uint8_t bsmod;
- uint8_t acmod;
- uint8_t cmixlev;
- uint8_t surmixlev;
- uint8_t dsurmod;
- uint8_t lfeon;
+ uint8_t sr_code;
+ uint8_t bitstream_id;
+ uint8_t channel_mode;
+ uint8_t lfe_on;
+ uint8_t frame_type;
+ int substreamid; ///< substream identification
+ int center_mix_level; ///< Center mix level index
+ int surround_mix_level; ///< Surround mix level index
+ uint16_t channel_map;
+ int num_blocks; ///< number of audio blocks
/** @} */
/** @defgroup derived Derived values
* @{
*/
- uint8_t halfratecod;
+ uint8_t sr_shift;
uint16_t sample_rate;
uint32_t bit_rate;
uint8_t channels;
/** @} */
} AC3HeaderInfo;
-/**
- * Parses AC-3 frame header.
- * Parses the header up to the lfeon element, which is the first 52 or 54 bits
- * depending on the audio coding mode.
- * @param buf[in] Array containing the first 7 bytes of the frame.
- * @param hdr[out] Pointer to struct where header info is written.
- * @return Returns 0 on success, -1 if there is a sync word mismatch,
- * -2 if the bsid (version) element is invalid, -3 if the fscod (sample rate)
- * element is invalid, or -4 if the frmsizecod (bit rate) element is invalid.
- */
-int ff_ac3_parse_header(const uint8_t buf[7], AC3HeaderInfo *hdr);
-
-extern const uint16_t ff_ac3_frame_sizes[38][3];
-extern const uint8_t ff_ac3_channels[8];
-extern const uint16_t ff_ac3_freqs[3];
-extern const uint16_t ff_ac3_bitratetab[19];
-extern const int16_t ff_ac3_window[256];
-extern const uint8_t ff_sdecaytab[4];
-extern const uint8_t ff_fdecaytab[4];
-extern const uint16_t ff_sgaintab[4];
-extern const uint16_t ff_dbkneetab[4];
-extern const int16_t ff_floortab[8];
-extern const uint16_t ff_fgaintab[8];
+typedef enum {
+ EAC3_FRAME_TYPE_INDEPENDENT = 0,
+ EAC3_FRAME_TYPE_DEPENDENT,
+ EAC3_FRAME_TYPE_AC3_CONVERT,
+ EAC3_FRAME_TYPE_RESERVED
+} EAC3FrameType;
void ac3_common_init(void);
* @param[in] start starting bin location
* @param[in] end ending bin location
* @param[out] psd signal power for each frequency bin
- * @param[out] bndpsd signal power for each critical band
+ * @param[out] band_psd signal power for each critical band
*/
void ff_ac3_bit_alloc_calc_psd(int8_t *exp, int start, int end, int16_t *psd,
- int16_t *bndpsd);
+ int16_t *band_psd);
/**
* Calculates the masking curve.
* allocation information is provided, it is used for adjusting the masking
* curve, usually to give a closer match to a better psychoacoustic model.
*
- * @param[in] s adjustable bit allocation parameters
- * @param[in] bndpsd signal power for each critical band
- * @param[in] start starting bin location
- * @param[in] end ending bin location
- * @param[in] fgain fast gain (estimated signal-to-mask ratio)
- * @param[in] is_lfe whether or not the channel being processed is the LFE
- * @param[in] deltbae delta bit allocation exists (none, reuse, or new)
- * @param[in] deltnseg number of delta segments
- * @param[in] deltoffst location offsets for each segment
- * @param[in] deltlen length of each segment
- * @param[in] deltba delta bit allocation for each segment
- * @param[out] mask calculated masking curve
+ * @param[in] s adjustable bit allocation parameters
+ * @param[in] band_psd signal power for each critical band
+ * @param[in] start starting bin location
+ * @param[in] end ending bin location
+ * @param[in] fast_gain fast gain (estimated signal-to-mask ratio)
+ * @param[in] is_lfe whether or not the channel being processed is the LFE
+ * @param[in] dba_mode delta bit allocation mode (none, reuse, or new)
+ * @param[in] dba_nsegs number of delta segments
+ * @param[in] dba_offsets location offsets for each segment
+ * @param[in] dba_lengths length of each segment
+ * @param[in] dba_values delta bit allocation for each segment
+ * @param[out] mask calculated masking curve
*/
-void ff_ac3_bit_alloc_calc_mask(AC3BitAllocParameters *s, int16_t *bndpsd,
- int start, int end, int fgain, int is_lfe,
- int deltbae, int deltnseg, uint8_t *deltoffst,
- uint8_t *deltlen, uint8_t *deltba,
+void ff_ac3_bit_alloc_calc_mask(AC3BitAllocParameters *s, int16_t *band_psd,
+ int start, int end, int fast_gain, int is_lfe,
+ int dba_mode, int dba_nsegs, uint8_t *dba_offsets,
+ uint8_t *dba_lengths, uint8_t *dba_values,
int16_t *mask);
/**
* @param[in] psd signal power for each frequency bin
* @param[in] start starting bin location
* @param[in] end ending bin location
- * @param[in] snroffset SNR adjustment
+ * @param[in] snr_offset SNR adjustment
* @param[in] floor noise floor
+ * @param[in] bap_tab look-up table for bit allocation pointers
* @param[out] bap bit allocation pointers
*/
void ff_ac3_bit_alloc_calc_bap(int16_t *mask, int16_t *psd, int start, int end,
- int snroffset, int floor, uint8_t *bap);
+ int snr_offset, int floor,
+ const uint8_t *bap_tab, uint8_t *bap);
void ac3_parametric_bit_allocation(AC3BitAllocParameters *s, uint8_t *bap,
int8_t *exp, int start, int end,
- int snroffset, int fgain, int is_lfe,
- int deltbae,int deltnseg,
- uint8_t *deltoffst, uint8_t *deltlen, uint8_t *deltba);
+ int snr_offset, int fast_gain, int is_lfe,
+ int dba_mode, int dba_nsegs,
+ uint8_t *dba_offsets, uint8_t *dba_lengths,
+ uint8_t *dba_values);
+
+#endif /* FFMPEG_AC3_H */
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