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qdm2: Use floating point synthesis filter.

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This avoid needlessly convertion from floating point to fixed point and back.

Signed-off-by: Ronald S. Bultje <rsbultje@gmail.com>
This commit is contained in:
Vitor Sessak 2011-05-19 21:33:27 +02:00 committed by Ronald S. Bultje
parent 4e987f8282
commit 984ece7503
1 changed files with 12 additions and 17 deletions
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29
libavcodec/qdm2.c
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@ -172,9 +172,9 @@ typedef struct {
/// Synthesis filter /// Synthesis filter
MPADSPContext mpadsp; MPADSPContext mpadsp;
DECLARE_ALIGNED(16, MPA_INT, synth_buf)[MPA_MAX_CHANNELS][512*2]; DECLARE_ALIGNED(32, float, synth_buf)[MPA_MAX_CHANNELS][512*2];
int synth_buf_offset[MPA_MAX_CHANNELS]; int synth_buf_offset[MPA_MAX_CHANNELS];
DECLARE_ALIGNED(16, int32_t, sb_samples)[MPA_MAX_CHANNELS][128][SBLIMIT]; DECLARE_ALIGNED(32, float, sb_samples)[MPA_MAX_CHANNELS][128][SBLIMIT];
/// Mixed temporary data used in decoding /// Mixed temporary data used in decoding
float tone_level[MPA_MAX_CHANNELS][30][64]; float tone_level[MPA_MAX_CHANNELS][30][64];
@ -331,11 +331,6 @@ static av_cold void qdm2_init_vlc(void)
} }
} }
/* for floating point to fixed point conversion */
static const float f2i_scale = (float) (1 << (FRAC_BITS - 15));
static int qdm2_get_vlc (GetBitContext *gb, VLC *vlc, int flag, int depth) static int qdm2_get_vlc (GetBitContext *gb, VLC *vlc, int flag, int depth)
{ {
int value; int value;
@ -484,8 +479,8 @@ static void build_sb_samples_from_noise (QDM2Context *q, int sb)
for (ch = 0; ch < q->nb_channels; ch++) for (ch = 0; ch < q->nb_channels; ch++)
for (j = 0; j < 64; j++) { for (j = 0; j < 64; j++) {
q->sb_samples[ch][j * 2][sb] = (int32_t)(f2i_scale * SB_DITHERING_NOISE(sb,q->noise_idx) * q->tone_level[ch][sb][j] + .5); q->sb_samples[ch][j * 2][sb] = SB_DITHERING_NOISE(sb,q->noise_idx) * q->tone_level[ch][sb][j];
q->sb_samples[ch][j * 2 + 1][sb] = (int32_t)(f2i_scale * SB_DITHERING_NOISE(sb,q->noise_idx) * q->tone_level[ch][sb][j] + .5); q->sb_samples[ch][j * 2 + 1][sb] = SB_DITHERING_NOISE(sb,q->noise_idx) * q->tone_level[ch][sb][j];
} }
} }
@ -925,11 +920,11 @@ static void synthfilt_build_sb_samples (QDM2Context *q, GetBitContext *gb, int l
for (chs = 0; chs < q->nb_channels; chs++) for (chs = 0; chs < q->nb_channels; chs++)
for (k = 0; k < run; k++) for (k = 0; k < run; k++)
if ((j + k) < 128) if ((j + k) < 128)
q->sb_samples[chs][j + k][sb] = (int32_t)(f2i_scale * q->tone_level[chs][sb][((j + k)/2)] * tmp[k][chs] + .5); q->sb_samples[chs][j + k][sb] = q->tone_level[chs][sb][((j + k)/2)] * tmp[k][chs];
} else { } else {
for (k = 0; k < run; k++) for (k = 0; k < run; k++)
if ((j + k) < 128) if ((j + k) < 128)
q->sb_samples[ch][j + k][sb] = (int32_t)(f2i_scale * q->tone_level[ch][sb][(j + k)/2] * samples[k] + .5); q->sb_samples[ch][j + k][sb] = q->tone_level[ch][sb][(j + k)/2] * samples[k];
} }
j += run; j += run;
@ -1603,7 +1598,7 @@ static void qdm2_calculate_fft (QDM2Context *q, int channel, int sub_packet)
*/ */
static void qdm2_synthesis_filter (QDM2Context *q, int index) static void qdm2_synthesis_filter (QDM2Context *q, int index)
{ {
OUT_INT samples[MPA_MAX_CHANNELS * MPA_FRAME_SIZE]; float samples[MPA_MAX_CHANNELS * MPA_FRAME_SIZE];
int i, k, ch, sb_used, sub_sampling, dither_state = 0; int i, k, ch, sb_used, sub_sampling, dither_state = 0;
/* copy sb_samples */ /* copy sb_samples */
@ -1615,12 +1610,12 @@ static void qdm2_synthesis_filter (QDM2Context *q, int index)
q->sb_samples[ch][(8 * index) + i][k] = 0; q->sb_samples[ch][(8 * index) + i][k] = 0;
for (ch = 0; ch < q->nb_channels; ch++) { for (ch = 0; ch < q->nb_channels; ch++) {
OUT_INT *samples_ptr = samples + ch; float *samples_ptr = samples + ch;
for (i = 0; i < 8; i++) { for (i = 0; i < 8; i++) {
ff_mpa_synth_filter_fixed(&q->mpadsp, ff_mpa_synth_filter_float(&q->mpadsp,
q->synth_buf[ch], &(q->synth_buf_offset[ch]), q->synth_buf[ch], &(q->synth_buf_offset[ch]),
ff_mpa_synth_window_fixed, &dither_state, ff_mpa_synth_window_float, &dither_state,
samples_ptr, q->nb_channels, samples_ptr, q->nb_channels,
q->sb_samples[ch][(8 * index) + i]); q->sb_samples[ch][(8 * index) + i]);
samples_ptr += 32 * q->nb_channels; samples_ptr += 32 * q->nb_channels;
@ -1632,7 +1627,7 @@ static void qdm2_synthesis_filter (QDM2Context *q, int index)
for (ch = 0; ch < q->channels; ch++) for (ch = 0; ch < q->channels; ch++)
for (i = 0; i < q->frame_size; i++) for (i = 0; i < q->frame_size; i++)
q->output_buffer[q->channels * i + ch] += (float)(samples[q->nb_channels * sub_sampling * i + ch] >> (sizeof(OUT_INT)*8-16)); q->output_buffer[q->channels * i + ch] += (1 << 23) * samples[q->nb_channels * sub_sampling * i + ch];
} }
@ -1649,7 +1644,7 @@ static av_cold void qdm2_init(QDM2Context *q) {
initialized = 1; initialized = 1;
qdm2_init_vlc(); qdm2_init_vlc();
ff_mpa_synth_init_fixed(ff_mpa_synth_window_fixed); ff_mpa_synth_init_float(ff_mpa_synth_window_float);
softclip_table_init(); softclip_table_init();
rnd_table_init(); rnd_table_init();
init_noise_samples(); init_noise_samples();