MP3: Support decode mp3 by FFmpeg natively. (#296) (#3340)

trunk/3rdparty/ffmpeg-4-fit/libavcodec/dct.c

@@ -0,0 +1,225 @@
+/*
+ * (I)DCT Transforms
+ * Copyright (c) 2009 Peter Ross <pross@xvid.org>
+ * Copyright (c) 2010 Alex Converse <alex.converse@gmail.com>
+ * Copyright (c) 2010 Vitor Sessak
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
+ */
+
+/**
+ * @file
+ * (Inverse) Discrete Cosine Transforms. These are also known as the
+ * type II and type III DCTs respectively.
+ */
+
+#include <math.h>
+#include <string.h>
+
+#include "libavutil/mathematics.h"
+#include "dct.h"
+#include "dct32.h"
+
+/* sin((M_PI * x / (2 * n)) */
+#define SIN(s, n, x) (s->costab[(n) - (x)])
+
+/* cos((M_PI * x / (2 * n)) */
+#define COS(s, n, x) (s->costab[x])
+
+static void dst_calc_I_c(DCTContext *ctx, FFTSample *data)
+{
+    int n = 1 << ctx->nbits;
+    int i;
+
+    data[0] = 0;
+    for (i = 1; i < n / 2; i++) {
+        float tmp1   = data[i    ];
+        float tmp2   = data[n - i];
+        float s      = SIN(ctx, n, 2 * i);
+
+        s           *= tmp1 + tmp2;
+        tmp1         = (tmp1 - tmp2) * 0.5f;
+        data[i]      = s + tmp1;
+        data[n - i]  = s - tmp1;
+    }
+
+    data[n / 2] *= 2;
+    ctx->rdft.rdft_calc(&ctx->rdft, data);
+
+    data[0] *= 0.5f;
+
+    for (i = 1; i < n - 2; i += 2) {
+        data[i + 1] +=  data[i - 1];
+        data[i]      = -data[i + 2];
+    }
+
+    data[n - 1] = 0;
+}
+
+static void dct_calc_I_c(DCTContext *ctx, FFTSample *data)
+{
+    int n = 1 << ctx->nbits;
+    int i;
+    float next = -0.5f * (data[0] - data[n]);
+
+    for (i = 0; i < n / 2; i++) {
+        float tmp1 = data[i];
+        float tmp2 = data[n - i];
+        float s    = SIN(ctx, n, 2 * i);
+        float c    = COS(ctx, n, 2 * i);
+
+        c *= tmp1 - tmp2;
+        s *= tmp1 - tmp2;
+
+        next += c;
+
+        tmp1        = (tmp1 + tmp2) * 0.5f;
+        data[i]     = tmp1 - s;
+        data[n - i] = tmp1 + s;
+    }
+
+    ctx->rdft.rdft_calc(&ctx->rdft, data);
+    data[n] = data[1];
+    data[1] = next;
+
+    for (i = 3; i <= n; i += 2)
+        data[i] = data[i - 2] - data[i];
+}
+
+static void dct_calc_III_c(DCTContext *ctx, FFTSample *data)
+{
+    int n = 1 << ctx->nbits;
+    int i;
+
+    float next  = data[n - 1];
+    float inv_n = 1.0f / n;
+
+    for (i = n - 2; i >= 2; i -= 2) {
+        float val1 = data[i];
+        float val2 = data[i - 1] - data[i + 1];
+        float c    = COS(ctx, n, i);
+        float s    = SIN(ctx, n, i);
+
+        data[i]     = c * val1 + s * val2;
+        data[i + 1] = s * val1 - c * val2;
+    }
+
+    data[1] = 2 * next;
+
+    ctx->rdft.rdft_calc(&ctx->rdft, data);
+
+    for (i = 0; i < n / 2; i++) {
+        float tmp1 = data[i]         * inv_n;
+        float tmp2 = data[n - i - 1] * inv_n;
+        float csc  = ctx->csc2[i] * (tmp1 - tmp2);
+
+        tmp1            += tmp2;
+        data[i]          = tmp1 + csc;
+        data[n - i - 1]  = tmp1 - csc;
+    }
+}
+
+static void dct_calc_II_c(DCTContext *ctx, FFTSample *data)
+{
+    int n = 1 << ctx->nbits;
+    int i;
+    float next;
+
+    for (i = 0; i < n / 2; i++) {
+        float tmp1 = data[i];
+        float tmp2 = data[n - i - 1];
+        float s    = SIN(ctx, n, 2 * i + 1);
+
+        s    *= tmp1 - tmp2;
+        tmp1  = (tmp1 + tmp2) * 0.5f;
+
+        data[i]     = tmp1 + s;
+        data[n-i-1] = tmp1 - s;
+    }
+
+    ctx->rdft.rdft_calc(&ctx->rdft, data);
+
+    next     = data[1] * 0.5;
+    data[1] *= -1;
+
+    for (i = n - 2; i >= 0; i -= 2) {
+        float inr = data[i    ];
+        float ini = data[i + 1];
+        float c   = COS(ctx, n, i);
+        float s   = SIN(ctx, n, i);
+
+        data[i]     = c * inr + s * ini;
+        data[i + 1] = next;
+
+        next += s * inr - c * ini;
+    }
+}
+
+static void dct32_func(DCTContext *ctx, FFTSample *data)
+{
+    ctx->dct32(data, data);
+}
+
+av_cold int ff_dct_init(DCTContext *s, int nbits, enum DCTTransformType inverse)
+{
+    int n = 1 << nbits;
+    int i;
+    int ret;
+
+    memset(s, 0, sizeof(*s));
+
+    s->nbits   = nbits;
+    s->inverse = inverse;
+
+    if (inverse == DCT_II && nbits == 5) {
+        s->dct_calc = dct32_func;
+    } else {
+        ff_init_ff_cos_tabs(nbits + 2);
+
+        s->costab = ff_cos_tabs[nbits + 2];
+        s->csc2   = av_malloc_array(n / 2, sizeof(FFTSample));
+        if (!s->csc2)
+            return AVERROR(ENOMEM);
+
+        if ((ret = ff_rdft_init(&s->rdft, nbits, inverse == DCT_III)) < 0) {
+            av_freep(&s->csc2);
+            return ret;
+        }
+
+        for (i = 0; i < n / 2; i++)
+            s->csc2[i] = 0.5 / sin((M_PI / (2 * n) * (2 * i + 1)));
+
+        switch (inverse) {
+        case DCT_I  : s->dct_calc = dct_calc_I_c;   break;
+        case DCT_II : s->dct_calc = dct_calc_II_c;  break;
+        case DCT_III: s->dct_calc = dct_calc_III_c; break;
+        case DST_I  : s->dct_calc = dst_calc_I_c;   break;
+        }
+    }
+
+    s->dct32 = ff_dct32_float;
+    if (ARCH_X86)
+        ff_dct_init_x86(s);
+
+    return 0;
+}
+
+av_cold void ff_dct_end(DCTContext *s)
+{
+    ff_rdft_end(&s->rdft);
+    av_freep(&s->csc2);
+}

trunk/3rdparty/ffmpeg-4-fit/libavcodec/dct32.h

@@ -0,0 +1,25 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#ifndef AVCODEC_DCT32_H
+#define AVCODEC_DCT32_H
+
+void ff_dct32_float(float *dst, const float *src);
+void ff_dct32_fixed(int *dst, const int *src);
+
+#endif /* AVCODEC_DCT32_H */

trunk/3rdparty/ffmpeg-4-fit/libavcodec/dct32_fixed.c

@@ -0,0 +1,20 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#define DCT32_FLOAT 0
+#include "dct32_template.c"

trunk/3rdparty/ffmpeg-4-fit/libavcodec/dct32_float.c

@@ -0,0 +1,20 @@
+/*
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public
+ * License as published by the Free Software Foundation; either
+ * version 2.1 of the License, or (at your option) any later version.
+ *
+ * FFmpeg is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+ * Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public
+ * License along with FFmpeg; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#define DCT32_FLOAT 1
+#include "dct32_template.c"