diff options
author | Benjamin Larsson <banan@ludd.ltu.se> | 2009-09-08 23:25:54 +0400 |
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committer | Benjamin Larsson <banan@ludd.ltu.se> | 2009-09-08 23:25:54 +0400 |
commit | 0e1baedec302e6d952bc46708753aaa586b33651 (patch) | |
tree | f96645ecdd0233af15544cbe8c3b0d4a68631c01 /libavcodec/atrac3.c | |
parent | b057170f324da3657cc8723f97086c2c756a85b8 (diff) |
Split out common routines needed in the atrac1 decoder from atrac3.c to atrac.c.
Originally committed as revision 19796 to svn://svn.ffmpeg.org/ffmpeg/trunk
Diffstat (limited to 'libavcodec/atrac3.c')
-rw-r--r-- | libavcodec/atrac3.c | 70 |
1 files changed, 7 insertions, 63 deletions
diff --git a/libavcodec/atrac3.c b/libavcodec/atrac3.c index 9aa725b2a2..91dc80bfd4 100644 --- a/libavcodec/atrac3.c +++ b/libavcodec/atrac3.c @@ -41,6 +41,7 @@ #include "dsputil.h" #include "bytestream.h" +#include "atrac.h" #include "atrac3data.h" #define JOINT_STEREO 0x12 @@ -119,68 +120,13 @@ typedef struct { } ATRAC3Context; static DECLARE_ALIGNED_16(float,mdct_window[512]); -static float qmf_window[48]; static VLC spectral_coeff_tab[7]; -static float SFTable[64]; static float gain_tab1[16]; static float gain_tab2[31]; static MDCTContext mdct_ctx; static DSPContext dsp; -/* quadrature mirror synthesis filter */ - -/** - * Quadrature mirror synthesis filter. - * - * @param inlo lower part of spectrum - * @param inhi higher part of spectrum - * @param nIn size of spectrum buffer - * @param pOut out buffer - * @param delayBuf delayBuf buffer - * @param temp temp buffer - */ - - -static void iqmf (float *inlo, float *inhi, unsigned int nIn, float *pOut, float *delayBuf, float *temp) -{ - int i, j; - float *p1, *p3; - - memcpy(temp, delayBuf, 46*sizeof(float)); - - p3 = temp + 46; - - /* loop1 */ - for(i=0; i<nIn; i+=2){ - p3[2*i+0] = inlo[i ] + inhi[i ]; - p3[2*i+1] = inlo[i ] - inhi[i ]; - p3[2*i+2] = inlo[i+1] + inhi[i+1]; - p3[2*i+3] = inlo[i+1] - inhi[i+1]; - } - - /* loop2 */ - p1 = temp; - for (j = nIn; j != 0; j--) { - float s1 = 0.0; - float s2 = 0.0; - - for (i = 0; i < 48; i += 2) { - s1 += p1[i] * qmf_window[i]; - s2 += p1[i+1] * qmf_window[i+1]; - } - - pOut[0] = s2; - pOut[1] = s1; - - p1 += 2; - pOut += 2; - } - - /* Update the delay buffer. */ - memcpy(delayBuf, temp + nIn*2, 46*sizeof(float)); -} - /** * Regular 512 points IMDCT without overlapping, with the exception of the swapping of odd bands * caused by the reverse spectra of the QMF. @@ -386,7 +332,7 @@ static int decodeSpectrum (GetBitContext *gb, float *pOut) readQuantSpectralCoeffs (gb, subband_vlc_index[cnt], codingMode, mantissas, subbWidth); /* Decode the scale factor for this subband. */ - SF = SFTable[SF_idxs[cnt]] * iMaxQuant[subband_vlc_index[cnt]]; + SF = sf_table[SF_idxs[cnt]] * iMaxQuant[subband_vlc_index[cnt]]; /* Inverse quantize the coefficients. */ for (pIn=mantissas ; first<last; first++, pIn++) @@ -459,7 +405,7 @@ static int decodeTonalComponents (GetBitContext *gb, tonal_component *pComponent coded_values = coded_values_per_component + 1; coded_values = FFMIN(max_coded_values,coded_values); - scalefactor = SFTable[sfIndx] * iMaxQuant[quant_step_index]; + scalefactor = sf_table[sfIndx] * iMaxQuant[quant_step_index]; readQuantSpectralCoeffs(gb, quant_step_index, coding_mode, mantissa, coded_values); @@ -860,9 +806,9 @@ static int decodeFrame(ATRAC3Context *q, const uint8_t* databuf) p2= p1+256; p3= p2+256; p4= p3+256; - iqmf (p1, p2, 256, p1, q->pUnits[i].delayBuf1, q->tempBuf); - iqmf (p4, p3, 256, p3, q->pUnits[i].delayBuf2, q->tempBuf); - iqmf (p1, p3, 512, p1, q->pUnits[i].delayBuf3, q->tempBuf); + atrac_iqmf (p1, p2, 256, p1, q->pUnits[i].delayBuf1, q->tempBuf); + atrac_iqmf (p4, p3, 256, p3, q->pUnits[i].delayBuf2, q->tempBuf); + atrac_iqmf (p1, p3, 512, p1, q->pUnits[i].delayBuf3, q->tempBuf); p1 +=1024; } @@ -1038,9 +984,7 @@ static av_cold int atrac3_decode_init(AVCodecContext *avctx) init_atrac3_transforms(q); - /* Generate the scale factors. */ - for (i=0 ; i<64 ; i++) - SFTable[i] = pow(2.0, (i - 15) / 3.0); + atrac_generate_tables(); /* Generate gain tables. */ for (i=0 ; i<16 ; i++) |