[FFmpeg-cvslog] r16865 - in trunk: configure libavcodec/qdm2.c
alexc
subversion
Fri Jan 30 21:33:29 CET 2009
Author: alexc
Date: Fri Jan 30 21:33:29 2009
New Revision: 16865
Log:
Use the new RDFT code in the QDM2 decoder.
Modified:
trunk/configure
trunk/libavcodec/qdm2.c
Modified: trunk/configure
==============================================================================
--- trunk/configure Fri Jan 30 21:15:48 2009 (r16864)
+++ trunk/configure Fri Jan 30 21:33:29 2009 (r16865)
@@ -1018,7 +1018,7 @@ nellymoser_decoder_select="fft mdct"
nellymoser_encoder_select="fft mdct"
png_decoder_select="zlib"
png_encoder_select="zlib"
-qdm2_decoder_select="fft mdct"
+qdm2_decoder_select="fft mdct rdft"
rv10_encoder_select="aandct"
rv20_encoder_select="aandct"
shorten_decoder_select="golomb"
Modified: trunk/libavcodec/qdm2.c
==============================================================================
--- trunk/libavcodec/qdm2.c Fri Jan 30 21:15:48 2009 (r16864)
+++ trunk/libavcodec/qdm2.c Fri Jan 30 21:33:29 2009 (r16865)
@@ -98,9 +98,13 @@ typedef struct QDM2SubPNode {
} QDM2SubPNode;
typedef struct {
+ float re;
+ float im;
+} QDM2Complex;
+
+typedef struct {
float level;
- float *samples_im;
- float *samples_re;
+ QDM2Complex *complex;
const float *table;
int phase;
int phase_shift;
@@ -118,14 +122,7 @@ typedef struct {
} FFTCoefficient;
typedef struct {
- float re;
- float im;
-} QDM2Complex;
-
-typedef struct {
- DECLARE_ALIGNED_16(QDM2Complex, complex[256 + 1]);
- float samples_im[MPA_MAX_CHANNELS][256];
- float samples_re[MPA_MAX_CHANNELS][256];
+ DECLARE_ALIGNED_16(QDM2Complex, complex[MPA_MAX_CHANNELS][256]);
} QDM2FFT;
/**
@@ -166,8 +163,7 @@ typedef struct {
int fft_coefs_min_index[5];
int fft_coefs_max_index[5];
int fft_level_exp[6];
- FFTContext fft_ctx;
- FFTComplex exptab[128];
+ RDFTContext rdft_ctx;
QDM2FFT fft;
/// I/O data
@@ -1507,10 +1503,10 @@ static void qdm2_fft_generate_tone (QDM2
/* generate FFT coefficients for tone */
if (tone->duration >= 3 || tone->cutoff >= 3) {
- tone->samples_im[0] += c.im;
- tone->samples_re[0] += c.re;
- tone->samples_im[1] -= c.im;
- tone->samples_re[1] -= c.re;
+ tone->complex[0].im += c.im;
+ tone->complex[0].re += c.re;
+ tone->complex[1].im -= c.im;
+ tone->complex[1].re -= c.re;
} else {
f[1] = -tone->table[4];
f[0] = tone->table[3] - tone->table[0];
@@ -1519,12 +1515,12 @@ static void qdm2_fft_generate_tone (QDM2
f[4] = tone->table[0] - tone->table[1];
f[5] = tone->table[2];
for (i = 0; i < 2; i++) {
- tone->samples_re[fft_cutoff_index_table[tone->cutoff][i]] += c.re * f[i];
- tone->samples_im[fft_cutoff_index_table[tone->cutoff][i]] += c.im *((tone->cutoff <= i) ? -f[i] : f[i]);
+ tone->complex[fft_cutoff_index_table[tone->cutoff][i]].re += c.re * f[i];
+ tone->complex[fft_cutoff_index_table[tone->cutoff][i]].im += c.im *((tone->cutoff <= i) ? -f[i] : f[i]);
}
for (i = 0; i < 4; i++) {
- tone->samples_re[i] += c.re * f[i+2];
- tone->samples_im[i] += c.im * f[i+2];
+ tone->complex[i].re += c.re * f[i+2];
+ tone->complex[i].im += c.im * f[i+2];
}
}
@@ -1542,8 +1538,7 @@ static void qdm2_fft_tone_synthesizer (Q
const double iscale = 0.25 * M_PI;
for (ch = 0; ch < q->channels; ch++) {
- memset(q->fft.samples_im[ch], 0, q->fft_size * sizeof(float));
- memset(q->fft.samples_re[ch], 0, q->fft_size * sizeof(float));
+ memset(q->fft.complex[ch], 0, q->fft_size * sizeof(QDM2Complex));
}
@@ -1561,10 +1556,10 @@ static void qdm2_fft_tone_synthesizer (Q
c.re = level * cos(q->fft_coefs[i].phase * iscale);
c.im = level * sin(q->fft_coefs[i].phase * iscale);
- q->fft.samples_re[ch][q->fft_coefs[i].offset + 0] += c.re;
- q->fft.samples_im[ch][q->fft_coefs[i].offset + 0] += c.im;
- q->fft.samples_re[ch][q->fft_coefs[i].offset + 1] -= c.re;
- q->fft.samples_im[ch][q->fft_coefs[i].offset + 1] -= c.im;
+ q->fft.complex[ch][q->fft_coefs[i].offset + 0].re += c.re;
+ q->fft.complex[ch][q->fft_coefs[i].offset + 0].im += c.im;
+ q->fft.complex[ch][q->fft_coefs[i].offset + 1].re -= c.re;
+ q->fft.complex[ch][q->fft_coefs[i].offset + 1].im -= c.im;
}
/* generate existing FFT tones */
@@ -1594,8 +1589,7 @@ static void qdm2_fft_tone_synthesizer (Q
tone.cutoff = (offset >= 60) ? 3 : 2;
tone.level = (q->fft_coefs[j].exp < 0) ? 0.0 : fft_tone_level_table[q->superblocktype_2_3 ? 0 : 1][q->fft_coefs[j].exp & 63];
- tone.samples_im = &q->fft.samples_im[ch][offset];
- tone.samples_re = &q->fft.samples_re[ch][offset];
+ tone.complex = &q->fft.complex[ch][offset];
tone.table = fft_tone_sample_table[i][q->fft_coefs[j].offset - (offset << four_i)];
tone.phase = 64 * q->fft_coefs[j].phase - (offset << 8) - 128;
tone.phase_shift = (2 * q->fft_coefs[j].offset + 1) << (7 - four_i);
@@ -1612,37 +1606,14 @@ static void qdm2_fft_tone_synthesizer (Q
static void qdm2_calculate_fft (QDM2Context *q, int channel, int sub_packet)
{
- const int n = 1 << (q->fft_order - 1);
- const int n2 = n >> 1;
- const float gain = (q->channels == 1 && q->nb_channels == 2) ? 0.25f : 0.50f;
- float c, s, f0, f1, f2, f3;
- int i, j;
-
- /* prerotation (or something like that) */
- for (i=1; i < n2; i++) {
- j = (n - i);
- c = q->exptab[i].re;
- s = -q->exptab[i].im;
- f0 = (q->fft.samples_re[channel][i] - q->fft.samples_re[channel][j]) * gain;
- f1 = (q->fft.samples_im[channel][i] + q->fft.samples_im[channel][j]) * gain;
- f2 = (q->fft.samples_re[channel][i] + q->fft.samples_re[channel][j]) * gain;
- f3 = (q->fft.samples_im[channel][i] - q->fft.samples_im[channel][j]) * gain;
- q->fft.complex[i].re = s * f0 - c * f1 + f2;
- q->fft.complex[i].im = c * f0 + s * f1 + f3;
- q->fft.complex[j].re = -s * f0 + c * f1 + f2;
- q->fft.complex[j].im = c * f0 + s * f1 - f3;
- }
-
- q->fft.complex[ 0].re = q->fft.samples_re[channel][ 0] * gain * 2.0;
- q->fft.complex[ 0].im = q->fft.samples_re[channel][ 0] * gain * 2.0;
- q->fft.complex[n2].re = q->fft.samples_re[channel][n2] * gain * 2.0;
- q->fft.complex[n2].im = -q->fft.samples_im[channel][n2] * gain * 2.0;
-
- ff_fft_permute(&q->fft_ctx, (FFTComplex *) q->fft.complex);
- ff_fft_calc (&q->fft_ctx, (FFTComplex *) q->fft.complex);
+ const float gain = (q->channels == 1 && q->nb_channels == 2) ? 0.5f : 1.0f;
+ int i;
+ q->fft.complex[channel][0].re *= 2.0f;
+ q->fft.complex[channel][0].im = 0.0f;
+ ff_rdft_calc(&q->rdft_ctx, (FFTSample *)q->fft.complex[channel]);
/* add samples to output buffer */
for (i = 0; i < ((q->fft_frame_size + 15) & ~15); i++)
- q->output_buffer[q->channels * i + channel] += ((float *) q->fft.complex)[i];
+ q->output_buffer[q->channels * i + channel] += ((float *) q->fft.complex[channel])[i] * gain;
}
@@ -1761,8 +1732,6 @@ static int qdm2_decode_init(AVCodecConte
uint8_t *extradata;
int extradata_size;
int tmp_val, tmp, size;
- int i;
- float alpha;
/* extradata parsing
@@ -1910,19 +1879,13 @@ static int qdm2_decode_init(AVCodecConte
else
s->coeff_per_sb_select = 2;
- // Fail on unknown fft order, if it's > 9 it can overflow s->exptab[]
+ // Fail on unknown fft order
if ((s->fft_order < 7) || (s->fft_order > 9)) {
av_log(avctx, AV_LOG_ERROR, "Unknown FFT order (%d), contact the developers!\n", s->fft_order);
return -1;
}
- ff_fft_init(&s->fft_ctx, s->fft_order - 1, 1);
-
- for (i = 1; i < (1 << (s->fft_order - 2)); i++) {
- alpha = 2 * M_PI * (float)i / (float)(1 << (s->fft_order - 1));
- s->exptab[i].re = cos(alpha);
- s->exptab[i].im = sin(alpha);
- }
+ ff_rdft_init(&s->rdft_ctx, s->fft_order, IRDFT);
qdm2_init(s);
@@ -1937,7 +1900,7 @@ static int qdm2_decode_close(AVCodecCont
{
QDM2Context *s = avctx->priv_data;
- ff_fft_end(&s->fft_ctx);
+ ff_rdft_end(&s->rdft_ctx);
return 0;
}
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