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| author | Justin Ruggles <justin.ruggles@gmail.com> | 2008-11-13 03:18:13 +0000 |
|---|---|---|
| committer | Justin Ruggles <justin.ruggles@gmail.com> | 2008-11-13 03:18:13 +0000 |
| commit | 0cc51734b20032a5fea3020e40db968c5da91d1f (patch) | |
| tree | 6052e9507c932776586f35c466a2b032061de8ae /libavcodec/ac3dec.h | |
| parent | 0c5d750df9d0293b2ce27b6821c3209952c4e6b8 (diff) | |
add support for spectral extension
Originally committed as revision 15812 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/ac3dec.h')
| -rw-r--r-- | libavcodec/ac3dec.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/libavcodec/ac3dec.h b/libavcodec/ac3dec.h index 617080910b..7d34837e0c 100644 --- a/libavcodec/ac3dec.h +++ b/libavcodec/ac3dec.h @@ -42,6 +42,11 @@ #define AC3_MAX_COEFS 256 #define AC3_BLOCK_SIZE 256 #define MAX_BLOCKS 6 +#define SPX_MAX_BANDS 17 + +#define INT24_MIN -8388608 +#define INT24_MAX 8388607 +#define M_SQRT_POW2_15 181 typedef struct { AVCodecContext *avctx; ///< parent context @@ -88,6 +93,26 @@ typedef struct { int cpl_coords[AC3_MAX_CHANNELS][18]; ///< coupling coordinates (cplco) ///@} +///@defgroup spx spectral extension +///@{ + int spx_in_use[MAX_BLOCKS]; ///< spectral extension in use (spxinu) + int channel_in_spx[AC3_MAX_CHANNELS]; ///< channel in spectral extension (chinspx) + int spx_atten_code[AC3_MAX_CHANNELS]; ///< spx attenuation code (spxattencod) + int spx_coords_exist[AC3_MAX_CHANNELS]; ///< indicates if a channel has spx coords (spxcoe) + int spx_start_subband; ///< spx beginning frequency band (spxbegf) + int spx_start_freq; ///< spx start frequency bin + int spx_end_freq; ///< spx end frequency bin + int spx_copy_start_freq; ///< spx starting frequency for copying (copystartmant) + int num_spx_subbands; ///< number of spectral extension subbands + int num_spx_bands; ///< number of spectral extension bands (nspxbnds) + uint8_t spx_band_struct[SPX_MAX_BANDS]; ///< spectral extension band structure (spxbndstrc) + int spx_band_sizes[SPX_MAX_BANDS]; ///< number of bins in each band (spxbndsztab) + int first_spx_coords[AC3_MAX_CHANNELS]; ///< first spx coordinates states (firstspxcos) + int spx_noise_blend[AC3_MAX_CHANNELS][SPX_MAX_BANDS]; ///< spx noise blending factor (nblendfact) + int spx_signal_blend[AC3_MAX_CHANNELS][SPX_MAX_BANDS]; ///< spx signal blending factor (sblendfact) + int spx_coords[AC3_MAX_CHANNELS][SPX_MAX_BANDS]; ///< spectral extension coordinates (spxco) +///@} + ///@defgroup aht adaptive hybrid transform int channel_uses_aht[AC3_MAX_CHANNELS]; ///< channel AHT in use (chahtinu) int pre_mantissa[AC3_MAX_CHANNELS][AC3_MAX_COEFS][MAX_BLOCKS]; ///< pre-IDCT mantissas @@ -179,4 +204,6 @@ int ff_eac3_parse_header(AC3DecodeContext *s); */ void ff_eac3_decode_transform_coeffs_aht_ch(AC3DecodeContext *s, int ch); +void ff_eac3_apply_spectral_extension(AC3DecodeContext *s); + #endif /* AVCODEC_AC3DEC_H */ |