diff options
Diffstat (limited to 'contrib/ffmpeg/libavcodec/ac3.h')
| -rw-r--r-- | contrib/ffmpeg/libavcodec/ac3.h | 120 |
1 files changed, 60 insertions, 60 deletions
diff --git a/contrib/ffmpeg/libavcodec/ac3.h b/contrib/ffmpeg/libavcodec/ac3.h index ae53a80c3..b5fa789c4 100644 --- a/contrib/ffmpeg/libavcodec/ac3.h +++ b/contrib/ffmpeg/libavcodec/ac3.h @@ -24,6 +24,11 @@ * Common code between AC3 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 */ @@ -38,11 +43,31 @@ #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; /** @@ -55,21 +80,16 @@ typedef struct { */ 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; /** @} */ /** @defgroup derived Derived values * @{ */ - uint8_t halfratecod; + uint8_t sr_shift; uint16_t sample_rate; uint32_t bit_rate; uint8_t channels; @@ -77,29 +97,6 @@ typedef struct { /** @} */ } 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]; void ac3_common_init(void); @@ -115,10 +112,10 @@ 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. @@ -128,23 +125,23 @@ void ff_ac3_bit_alloc_calc_psd(int8_t *exp, int start, int end, int16_t *psd, * 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); /** @@ -157,15 +154,18 @@ void ff_ac3_bit_alloc_calc_mask(AC3BitAllocParameters *s, int16_t *bndpsd, * @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[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, 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 */ |