diff options
author | Daniil Cherednik <dan.cherednik@gmail.com> | 2018-01-08 01:39:22 +0300 |
---|---|---|
committer | Rostislav Pehlivanov <atomnuker@gmail.com> | 2018-01-13 21:13:58 +0300 |
commit | ec6e389c753ba7de0303e8094a494a981b927b77 (patch) | |
tree | 2d92c7239fd4ec40ec4fe9f24c407b48c0ddf9b6 /libavcodec/dcaenc.c | |
parent | 56e11ebf55a5e51a8a7131d382c2020e35d34f42 (diff) |
avcodec/dcaenc: Use ffmpeg mdct instead of own implementation
Signed-off-by: Daniil Cherednik <dan.cherednik@gmail.com>
Diffstat (limited to 'libavcodec/dcaenc.c')
-rw-r--r-- | libavcodec/dcaenc.c | 118 |
1 files changed, 31 insertions, 87 deletions
diff --git a/libavcodec/dcaenc.c b/libavcodec/dcaenc.c index 7ba2346ef1..0967c56396 100644 --- a/libavcodec/dcaenc.c +++ b/libavcodec/dcaenc.c @@ -21,6 +21,9 @@ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA */ +#define FFT_FLOAT 0 +#define FFT_FIXED_32 1 + #include "libavutil/avassert.h" #include "libavutil/channel_layout.h" #include "libavutil/common.h" @@ -33,6 +36,7 @@ #include "dca_core.h" #include "dcadata.h" #include "dcaenc.h" +#include "fft.h" #include "internal.h" #include "mathops.h" #include "put_bits.h" @@ -56,6 +60,7 @@ typedef struct DCAEncContext { AVClass *class; PutBitContext pb; DCAADPCMEncContext adpcm_ctx; + FFTContext mdct; CompressionOptions options; int frame_size; int frame_bits; @@ -154,6 +159,7 @@ static int encode_init(AVCodecContext *avctx) DCAEncContext *c = avctx->priv_data; uint64_t layout = avctx->channel_layout; int i, j, min_frame_bits; + int ret; if (subband_bufer_alloc(c)) return AVERROR(ENOMEM); @@ -231,6 +237,9 @@ static int encode_init(AVCodecContext *avctx) avctx->frame_size = 32 * SUBBAND_SAMPLES; + if ((ret = ff_mdct_init(&c->mdct, 9, 0, 1.0)) < 0) + return ret; + if (!cos_table[0]) { int j, k; @@ -296,6 +305,7 @@ static int encode_init(AVCodecContext *avctx) static av_cold int encode_close(AVCodecContext *avctx) { DCAEncContext *c = avctx->priv_data; + ff_mdct_end(&c->mdct); subband_bufer_free(c); ff_dcaadpcm_free(&c->adpcm_ctx); @@ -307,16 +317,6 @@ static inline int32_t cos_t(int x) return cos_table[x & 2047]; } -static inline int32_t sin_t(int x) -{ - return cos_t(x - 512); -} - -static inline int32_t half32(int32_t a) -{ - return (a + 1) >> 1; -} - static void subband_transform(DCAEncContext *c, const int32_t *input) { int ch, subs, i, k, j; @@ -397,78 +397,6 @@ static void lfe_downsample(DCAEncContext *c, const int32_t *input) } } -typedef struct { - int32_t re; - int32_t im; -} cplx32; - -static void fft(const int32_t in[2 * 256], cplx32 out[256]) -{ - cplx32 buf[256], rin[256], rout[256]; - int i, j, k, l; - - /* do two transforms in parallel */ - for (i = 0; i < 256; i++) { - /* Apply the Hann window */ - rin[i].re = mul32(in[2 * i], 0x3fffffff - (cos_t(8 * i + 2) >> 1)); - rin[i].im = mul32(in[2 * i + 1], 0x3fffffff - (cos_t(8 * i + 6) >> 1)); - } - /* pre-rotation */ - for (i = 0; i < 256; i++) { - buf[i].re = mul32(cos_t(4 * i + 2), rin[i].re) - - mul32(sin_t(4 * i + 2), rin[i].im); - buf[i].im = mul32(cos_t(4 * i + 2), rin[i].im) - + mul32(sin_t(4 * i + 2), rin[i].re); - } - - for (j = 256, l = 1; j != 1; j >>= 1, l <<= 1) { - for (k = 0; k < 256; k += j) { - for (i = k; i < k + j / 2; i++) { - cplx32 sum, diff; - int t = 8 * l * i; - - sum.re = buf[i].re + buf[i + j / 2].re; - sum.im = buf[i].im + buf[i + j / 2].im; - - diff.re = buf[i].re - buf[i + j / 2].re; - diff.im = buf[i].im - buf[i + j / 2].im; - - buf[i].re = half32(sum.re); - buf[i].im = half32(sum.im); - - buf[i + j / 2].re = mul32(diff.re, cos_t(t)) - - mul32(diff.im, sin_t(t)); - buf[i + j / 2].im = mul32(diff.im, cos_t(t)) - + mul32(diff.re, sin_t(t)); - } - } - } - /* post-rotation */ - for (i = 0; i < 256; i++) { - int b = ff_reverse[i]; - rout[i].re = mul32(buf[b].re, cos_t(4 * i)) - - mul32(buf[b].im, sin_t(4 * i)); - rout[i].im = mul32(buf[b].im, cos_t(4 * i)) - + mul32(buf[b].re, sin_t(4 * i)); - } - for (i = 0; i < 256; i++) { - /* separate the results of the two transforms */ - cplx32 o1, o2; - - o1.re = rout[i].re - rout[255 - i].re; - o1.im = rout[i].im + rout[255 - i].im; - - o2.re = rout[i].im - rout[255 - i].im; - o2.im = -rout[i].re - rout[255 - i].re; - - /* combine them into one long transform */ - out[i].re = mul32( o1.re + o2.re, cos_t(2 * i + 1)) - + mul32( o1.im - o2.im, sin_t(2 * i + 1)); - out[i].im = mul32( o1.im + o2.im, cos_t(2 * i + 1)) - + mul32(-o1.re + o2.re, sin_t(2 * i + 1)); - } -} - static int32_t get_cb(int32_t in) { int i, res; @@ -493,21 +421,37 @@ static int32_t add_cb(int32_t a, int32_t b) return a + cb_to_add[a - b]; } -static void adjust_jnd(int samplerate_index, +static void calc_power(DCAEncContext *c, + const int32_t in[2 * 256], int32_t power[256]) +{ + int i; + LOCAL_ALIGNED_32(int32_t, data, [512]); + LOCAL_ALIGNED_32(int32_t, coeff, [256]); + + for (i = 0; i < 512; i++) { + data[i] = norm__(mul32(in[i], 0x3fffffff - (cos_t(4 * i + 2) >> 1)), 4); + } + c->mdct.mdct_calc(&c->mdct, coeff, data); + for (i = 0; i < 256; i++) { + const int32_t cb = get_cb(coeff[i]); + power[i] = add_cb(cb, cb); + } +} + +static void adjust_jnd(DCAEncContext *c, const int32_t in[512], int32_t out_cb[256]) { int32_t power[256]; - cplx32 out[256]; int32_t out_cb_unnorm[256]; int32_t denom; const int32_t ca_cb = -1114; const int32_t cs_cb = 928; + const int samplerate_index = c->samplerate_index; int i, j; - fft(in, out); + calc_power(c, in, power); for (j = 0; j < 256; j++) { - power[j] = add_cb(get_cb(out[j].re), get_cb(out[j].im)); out_cb_unnorm[j] = -2047; /* and can only grow */ } @@ -585,7 +529,7 @@ static void calc_masking(DCAEncContext *c, const int32_t *input) data[i] = c->history[ch][k]; for (k -= 512; i < 512; i++, k++) data[i] = input[k * c->channels + chi]; - adjust_jnd(c->samplerate_index, data, c->masking_curve_cb[ssf]); + adjust_jnd(c, data, c->masking_curve_cb[ssf]); } for (i = 0; i < 256; i++) { int32_t m = 2048; |