forked from KolibriOS/kolibrios
213 lines
6.3 KiB
C
213 lines
6.3 KiB
C
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#include "layer3.h"
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extern MPEG_DECODE_OPTION m_option;
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extern SAMPLE m_sample[2][2][576];
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extern int m_frequency;
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extern SBT_PROC m_sbt_proc;
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extern XFORM_PROC m_xform_proc;
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extern int m_channels;
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extern int m_sfBandIndex[2][22];// [long/short][cb]
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extern int m_nBand[2][22];
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extern int m_band_limit;
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extern int m_band_limit21; // limit for sf band 21
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extern int m_band_limit12; // limit for sf band 12 short
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extern int m_band_limit_nsb;
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extern int m_ncbl_mixed;
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extern int m_nsb_limit;
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extern int m_gr;
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extern int m_buf_ptr0, m_buf_ptr1;
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extern float m_yout[576];
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//extern "l3sbt.c"
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void sbt_mono_L3(float *sample, signed short *pcm, int ch);
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void sbt_dual_L3(float *sample, signed short *pcm, int ch);
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void sbt16_mono_L3(float *sample, signed short *pcm, int ch);
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void sbt16_dual_L3(float *sample, signed short *pcm, int ch);
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void sbt8_mono_L3(float *sample, signed short *pcm, int ch);
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void sbt8_dual_L3(float *sample, signed short *pcm, int ch);
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void sbtB_mono_L3(float *sample, unsigned char *pcm, int ch);
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void sbtB_dual_L3(float *sample, unsigned char *pcm, int ch);
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void sbtB16_mono_L3(float *sample, unsigned char *pcm, int ch);
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void sbtB16_dual_L3(float *sample, unsigned char *pcm, int ch);
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void sbtB8_mono_L3(float *sample, unsigned char *pcm, int ch);
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void sbtB8_dual_L3(float *sample, unsigned char *pcm, int ch);
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//extern "l3dec.c"
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void xform_mono(void *pcm, int igr);
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void xform_dual(void *pcm, int igr);
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void xform_dual_mono(void *pcm, int igr);
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void xform_dual_right(void *pcm, int igr);
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static const SBT_PROC sbt_table[2][3][2] =
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{
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sbt_mono_L3,
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sbt_dual_L3,
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sbt16_mono_L3,
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sbt16_dual_L3,
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sbt8_mono_L3,
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sbt8_dual_L3,
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// 8 bit output
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sbtB_mono_L3,
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sbtB_dual_L3,
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sbtB16_mono_L3,
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sbtB16_dual_L3,
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sbtB8_mono_L3,
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sbtB8_dual_L3,
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};
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static const XFORM_PROC xform_table[5] =
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{
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xform_mono,
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xform_dual,
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xform_dual_mono,
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xform_mono, /* left */
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xform_dual_right,
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};
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static const struct {
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int l[23];
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int s[14];
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} sfBandTable[3][3] = {
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// MPEG-1
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{{
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{0, 4, 8, 12, 16, 20, 24, 30, 36, 44, 52, 62, 74, 90, 110, 134, 162, 196, 238, 288, 342, 418, 576},
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{0, 4, 8, 12, 16, 22, 30, 40, 52, 66, 84, 106, 136, 192}
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},{
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{0, 4, 8, 12, 16, 20, 24, 30, 36, 42, 50, 60, 72, 88, 106, 128, 156, 190, 230, 276, 330, 384, 576},
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{0, 4, 8, 12, 16, 22, 28, 38, 50, 64, 80, 100, 126, 192}
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},{
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{0, 4, 8, 12, 16, 20, 24, 30, 36, 44, 54, 66, 82, 102, 126, 156, 194, 240, 296, 364, 448, 550, 576},
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{0, 4, 8, 12, 16, 22, 30, 42, 58, 78, 104, 138, 180, 192}
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}},
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// MPEG-2
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{{
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{0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 116, 140, 168, 200, 238, 284, 336, 396, 464, 522, 576},
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{0, 4, 8, 12, 18, 24, 32, 42, 56, 74, 100, 132, 174, 192}
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},{
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{0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 114, 136, 162, 194, 232, 278, 332, 394, 464, 540, 576},
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{0, 4, 8, 12, 18, 26, 36, 48, 62, 80, 104, 136, 180, 192}
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},{
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{0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 116, 140, 168, 200, 238, 284, 336, 396, 464, 522, 576},
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{0, 4, 8, 12, 18, 26, 36, 48, 62, 80, 104, 134, 174, 192}
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}},
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// MPEG-2.5, 11 & 12 KHz seem ok, 8 ok
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{{
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{0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 116, 140, 168, 200, 238, 284, 336, 396, 464, 522, 576},
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{0, 4, 8, 12, 18, 26, 36, 48, 62, 80, 104, 134, 174, 192}
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},{
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{0, 6, 12, 18, 24, 30, 36, 44, 54, 66, 80, 96, 116, 140, 168, 200, 238, 284, 336, 396, 464, 522, 576},
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{0, 4, 8, 12, 18, 26, 36, 48, 62, 80, 104, 134, 174, 192}
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},{
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// this 8khz table, and only 8khz, from mpeg123)
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{0, 12, 24, 36, 48, 60, 72, 88, 108, 132, 160, 192, 232, 280, 336, 400, 476, 566, 568, 570, 572, 574, 576},
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{0, 8, 16, 24, 36, 52, 72, 96, 124, 160, 162, 164, 166, 192}
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}},
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};
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void quant_init();
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void alias_init();
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void msis_init();
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void fdct_init();
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void imdct_init();
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void hwin_init();
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void L3table_init()
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{
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quant_init();
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alias_init();
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msis_init();
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fdct_init();
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imdct_init();
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hwin_init();
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}
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int L3decode_start(MPEG_HEADER* h)
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{
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int i, j, k, v;
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int channels, limit;
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int bit_code;
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m_buf_ptr0 = 0;
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m_buf_ptr1 = 0;
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m_gr = 0;
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v = h->version - 1;
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if (h->version == 1) //MPEG-1
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m_ncbl_mixed = 8;
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else //MPEG-2, MPEG-2.5
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m_ncbl_mixed = 6;
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// compute nsb_limit
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m_nsb_limit = (m_option.freqLimit * 64L + m_frequency / 2) / m_frequency;
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// caller limit
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limit = (32 >> m_option.reduction);
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if (limit > 8)
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limit--;
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if (m_nsb_limit > limit)
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m_nsb_limit = limit;
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limit = 18 * m_nsb_limit;
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if (h->version == 1) {
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//MPEG-1
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m_band_limit12 = 3 * sfBandTable[v][h->fr_index].s[13];
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m_band_limit = m_band_limit21 = sfBandTable[v][h->fr_index].l[22];
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}
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else {
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//MPEG-2, MPEG-2.5
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m_band_limit12 = 3 * sfBandTable[v][h->fr_index].s[12];
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m_band_limit = m_band_limit21 = sfBandTable[v][h->fr_index].l[21];
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}
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m_band_limit += 8; // allow for antialias
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if (m_band_limit > limit)
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m_band_limit = limit;
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if (m_band_limit21 > m_band_limit)
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m_band_limit21 = m_band_limit;
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if (m_band_limit12 > m_band_limit)
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m_band_limit12 = m_band_limit;
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m_band_limit_nsb = (m_band_limit + 17) / 18; // limit nsb's rounded up
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/*
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gain_adjust = 0; // adjust gain e.g. cvt to mono sum channel
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if ((h->mode != 3) && (m_option.convert == 1))
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gain_adjust = -4;
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*/
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m_channels = (h->mode == 3) ? 1 : 2;
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if (m_option.convert) channels = 1;
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else channels = m_channels;
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bit_code = (m_option.convert & 8) ? 1 : 0;
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m_sbt_proc = sbt_table[bit_code][m_option.reduction][channels - 1];//[2][3][2]
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k = (h->mode != 3) ? (1 + m_option.convert) : 0;
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m_xform_proc = xform_table[k];//[5]
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/*
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if (bit_code)
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zero_level_pcm = 128;// 8 bit output
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else
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zero_level_pcm = 0;
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*/
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// init band tables
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for (i = 0; i < 22; i ++)
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m_sfBandIndex[0][i] = sfBandTable[v][h->fr_index].l[i + 1];
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for (i = 0; i < 13; i ++)
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m_sfBandIndex[1][i] = 3 * sfBandTable[v][h->fr_index].s[i + 1];
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for (i = 0; i < 22; i ++)
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m_nBand[0][i] = sfBandTable[v][h->fr_index].l[i + 1]
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- sfBandTable[v][h->fr_index].l[i];
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for (i = 0; i < 13; i ++)
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m_nBand[1][i] = sfBandTable[v][h->fr_index].s[i + 1]
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- sfBandTable[v][h->fr_index].s[i];
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// clear buffers
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for (i = 0; i < 576; i++)
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m_yout[i] = 0.0f;
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for (i = 0; i < 2; i ++)
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{ for (j = 0; j < 2; j ++)
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{ for (k = 0; k < 576; k++)
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{ m_sample[i][j][k].x = 0.0f;
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m_sample[i][j][k].s = 0;
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}
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}
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}
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return 1;
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}
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