Diffstat (limited to 'core/multimedia/opieplayer/libmpeg3/audio/synthesizers.c') (more/less context) (ignore whitespace changes)
| -rw-r--r-- | core/multimedia/opieplayer/libmpeg3/audio/synthesizers.c | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/core/multimedia/opieplayer/libmpeg3/audio/synthesizers.c b/core/multimedia/opieplayer/libmpeg3/audio/synthesizers.c new file mode 100644 index 0000000..71a74b3 --- a/dev/null +++ b/core/multimedia/opieplayer/libmpeg3/audio/synthesizers.c @@ -0,0 +1,174 @@ +#include "mpeg3audio.h" +#include "../libmpeg3.h" +#include "../mpeg3protos.h" +#include "tables.h" + +#define WRITE_SAMPLE(samples, sum) \ +{ \ + (*samples) = (sum); \ +} + +int mpeg3audio_synth_stereo(mpeg3audio_t *audio, mpeg3_real_t *bandPtr, int channel, mpeg3_real_t *out, int *pnt) +{ + const int step = 2; + mpeg3_real_t *samples = out + *pnt; + register mpeg3_real_t sum; + mpeg3_real_t *b0, (*buf)[0x110]; + int bo1; + + if(!channel) + { + audio->bo--; + audio->bo &= 0xf; + buf = audio->synth_stereo_buffs[0]; + } + else + { + samples++; + buf = audio->synth_stereo_buffs[1]; + } + + if(audio->bo & 0x1) + { + b0 = buf[0]; + bo1 = audio->bo; + mpeg3audio_dct64(buf[1] + ((audio->bo + 1) & 0xf), buf[0] + audio->bo, bandPtr); + } + else + { + b0 = buf[1]; + bo1 = audio->bo + 1; + mpeg3audio_dct64(buf[0] + audio->bo, buf[1] + audio->bo + 1, bandPtr); + } + +/*printf("%f %f %f\n", buf[0][0], buf[1][0], bandPtr[0]); */ + + { + register int j; + mpeg3_real_t *window = mpeg3_decwin + 16 - bo1; + + for(j = 16; j; j--, b0 += 0x10, window += 0x20, samples += step) + { + sum = window[0x0] * b0[0x0]; + sum -= window[0x1] * b0[0x1]; + sum += window[0x2] * b0[0x2]; + sum -= window[0x3] * b0[0x3]; + sum += window[0x4] * b0[0x4]; + sum -= window[0x5] * b0[0x5]; + sum += window[0x6] * b0[0x6]; + sum -= window[0x7] * b0[0x7]; + sum += window[0x8] * b0[0x8]; + sum -= window[0x9] * b0[0x9]; + sum += window[0xA] * b0[0xA]; + sum -= window[0xB] * b0[0xB]; + sum += window[0xC] * b0[0xC]; + sum -= window[0xD] * b0[0xD]; + sum += window[0xE] * b0[0xE]; + sum -= window[0xF] * b0[0xF]; + + WRITE_SAMPLE(samples, sum); + } + + sum = window[0x0] * b0[0x0]; + sum += window[0x2] * b0[0x2]; + sum += window[0x4] * b0[0x4]; + sum += window[0x6] * b0[0x6]; + sum += window[0x8] * b0[0x8]; + sum += window[0xA] * b0[0xA]; + sum += window[0xC] * b0[0xC]; + sum += window[0xE] * b0[0xE]; + WRITE_SAMPLE(samples, sum); + b0 -= 0x10; + window -= 0x20; + samples += step; + window += bo1 << 1; + + for(j = 15; j; j--, b0 -= 0x10, window -= 0x20, samples += step) + { + sum = -window[-0x1] * b0[0x0]; + sum -= window[-0x2] * b0[0x1]; + sum -= window[-0x3] * b0[0x2]; + sum -= window[-0x4] * b0[0x3]; + sum -= window[-0x5] * b0[0x4]; + sum -= window[-0x6] * b0[0x5]; + sum -= window[-0x7] * b0[0x6]; + sum -= window[-0x8] * b0[0x7]; + sum -= window[-0x9] * b0[0x8]; + sum -= window[-0xA] * b0[0x9]; + sum -= window[-0xB] * b0[0xA]; + sum -= window[-0xC] * b0[0xB]; + sum -= window[-0xD] * b0[0xC]; + sum -= window[-0xE] * b0[0xD]; + sum -= window[-0xF] * b0[0xE]; + sum -= window[-0x0] * b0[0xF]; + + WRITE_SAMPLE(samples, sum); + } + } + *pnt += 64; + + return 0; +} + +int mpeg3audio_synth_mono(mpeg3audio_t *audio, mpeg3_real_t *bandPtr, mpeg3_real_t *samples, int *pnt) +{ + mpeg3_real_t *samples_tmp = audio->synth_mono_buff; + mpeg3_real_t *tmp1 = samples_tmp; + int i, ret; + int pnt1 = 0; + + ret = mpeg3audio_synth_stereo(audio, bandPtr, 0, samples_tmp, &pnt1); + samples += *pnt; + + for(i = 0; i < 32; i++) + { + *samples = *tmp1; + samples++; + tmp1 += 2; + } + *pnt += 32; + + return ret; +} + + +/* Call this after every seek to reset the buffers */ +int mpeg3audio_reset_synths(mpeg3audio_t *audio) +{ + int i, j, k; + for(i = 0; i < 2; i++) + { + for(j = 0; j < 2; j++) + { + for(k = 0; k < 0x110; k++) + { + audio->synth_stereo_buffs[i][j][k] = 0; + } + } + } + for(i = 0; i < 64; i++) + { + audio->synth_mono_buff[i] = 0; + audio->layer2_scfsi_buf[i] = 0; + } + for(i = 0; i < 2; i++) + { + for(j = 0; j < 2; j++) + { + for(k = 0; k < SBLIMIT * SSLIMIT; k++) + { + audio->mp3_block[i][j][k] = 0; + } + } + } + audio->mp3_blc[0] = 0; + audio->mp3_blc[1] = 0; + for(i = 0; i < audio->channels; i++) + { + for(j = 0; j < AC3_N / 2; j++) + { + audio->ac3_delay[i][j] = 0; + } + } + return 0; +} |