dsputil: Split off IDCT bits into their own context

1 files changed, 197 insertions, 0 deletions

diff --git a/libavcodec/idctdsp.c b/libavcodec/idctdsp.c
new file mode 100644
index 0000000000..8542ab35aa
--- /dev/null
+++ b/libavcodec/idctdsp.c
@@ -0,0 +1,197 @@
+/*
+ * This file is part of Libav.
+ *
+ * Libav 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.
+ *
+ * Libav 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 Libav; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+
+#include "config.h"
+#include "libavutil/attributes.h"
+#include "libavutil/common.h"
+#include "avcodec.h"
+#include "dct.h"
+#include "faanidct.h"
+#include "idctdsp.h"
+#include "simple_idct.h"
+
+av_cold void ff_init_scantable(uint8_t *permutation, ScanTable *st,
+                               const uint8_t *src_scantable)
+{
+    int i, end;
+
+    st->scantable = src_scantable;
+
+    for (i = 0; i < 64; i++) {
+        int j = src_scantable[i];
+        st->permutated[i] = permutation[j];
+    }
+
+    end = -1;
+    for (i = 0; i < 64; i++) {
+        int j = st->permutated[i];
+        if (j > end)
+            end = j;
+        st->raster_end[i] = end;
+    }
+}
+
+av_cold void ff_init_scantable_permutation(uint8_t *idct_permutation,
+                                           int idct_permutation_type)
+{
+    int i;
+
+    if (ARCH_X86)
+        if (ff_init_scantable_permutation_x86(idct_permutation,
+                                              idct_permutation_type))
+            return;
+
+    switch (idct_permutation_type) {
+    case FF_NO_IDCT_PERM:
+        for (i = 0; i < 64; i++)
+            idct_permutation[i] = i;
+        break;
+    case FF_LIBMPEG2_IDCT_PERM:
+        for (i = 0; i < 64; i++)
+            idct_permutation[i] = (i & 0x38) | ((i & 6) >> 1) | ((i & 1) << 2);
+        break;
+    case FF_TRANSPOSE_IDCT_PERM:
+        for (i = 0; i < 64; i++)
+            idct_permutation[i] = ((i & 7) << 3) | (i >> 3);
+        break;
+    case FF_PARTTRANS_IDCT_PERM:
+        for (i = 0; i < 64; i++)
+            idct_permutation[i] = (i & 0x24) | ((i & 3) << 3) | ((i >> 3) & 3);
+        break;
+    default:
+        av_log(NULL, AV_LOG_ERROR,
+               "Internal error, IDCT permutation not set\n");
+    }
+}
+
+static void put_pixels_clamped_c(const int16_t *block, uint8_t *restrict pixels,
+                                 int line_size)
+{
+    int i;
+
+    /* read the pixels */
+    for (i = 0; i < 8; i++) {
+        pixels[0] = av_clip_uint8(block[0]);
+        pixels[1] = av_clip_uint8(block[1]);
+        pixels[2] = av_clip_uint8(block[2]);
+        pixels[3] = av_clip_uint8(block[3]);
+        pixels[4] = av_clip_uint8(block[4]);
+        pixels[5] = av_clip_uint8(block[5]);
+        pixels[6] = av_clip_uint8(block[6]);
+        pixels[7] = av_clip_uint8(block[7]);
+
+        pixels += line_size;
+        block  += 8;
+    }
+}
+
+static void put_signed_pixels_clamped_c(const int16_t *block,
+                                        uint8_t *restrict pixels,
+                                        int line_size)
+{
+    int i, j;
+
+    for (i = 0; i < 8; i++) {
+        for (j = 0; j < 8; j++) {
+            if (*block < -128)
+                *pixels = 0;
+            else if (*block > 127)
+                *pixels = 255;
+            else
+                *pixels = (uint8_t) (*block + 128);
+            block++;
+            pixels++;
+        }
+        pixels += (line_size - 8);
+    }
+}
+
+static void add_pixels_clamped_c(const int16_t *block, uint8_t *restrict pixels,
+                                 int line_size)
+{
+    int i;
+
+    /* read the pixels */
+    for (i = 0; i < 8; i++) {
+        pixels[0] = av_clip_uint8(pixels[0] + block[0]);
+        pixels[1] = av_clip_uint8(pixels[1] + block[1]);
+        pixels[2] = av_clip_uint8(pixels[2] + block[2]);
+        pixels[3] = av_clip_uint8(pixels[3] + block[3]);
+        pixels[4] = av_clip_uint8(pixels[4] + block[4]);
+        pixels[5] = av_clip_uint8(pixels[5] + block[5]);
+        pixels[6] = av_clip_uint8(pixels[6] + block[6]);
+        pixels[7] = av_clip_uint8(pixels[7] + block[7]);
+        pixels   += line_size;
+        block    += 8;
+    }
+}
+
+static void jref_idct_put(uint8_t *dest, int line_size, int16_t *block)
+{
+    ff_j_rev_dct(block);
+    put_pixels_clamped_c(block, dest, line_size);
+}
+
+static void jref_idct_add(uint8_t *dest, int line_size, int16_t *block)
+{
+    ff_j_rev_dct(block);
+    add_pixels_clamped_c(block, dest, line_size);
+}
+
+av_cold void ff_idctdsp_init(IDCTDSPContext *c, AVCodecContext *avctx)
+{
+    const unsigned high_bit_depth = avctx->bits_per_raw_sample > 8;
+
+    if (avctx->bits_per_raw_sample == 10) {
+        c->idct_put              = ff_simple_idct_put_10;
+        c->idct_add              = ff_simple_idct_add_10;
+        c->idct                  = ff_simple_idct_10;
+        c->idct_permutation_type = FF_NO_IDCT_PERM;
+    } else {
+        if (avctx->idct_algo == FF_IDCT_INT) {
+            c->idct_put              = jref_idct_put;
+            c->idct_add              = jref_idct_add;
+            c->idct                  = ff_j_rev_dct;
+            c->idct_permutation_type = FF_LIBMPEG2_IDCT_PERM;
+        } else if (avctx->idct_algo == FF_IDCT_FAAN) {
+            c->idct_put              = ff_faanidct_put;
+            c->idct_add              = ff_faanidct_add;
+            c->idct                  = ff_faanidct;
+            c->idct_permutation_type = FF_NO_IDCT_PERM;
+        } else { // accurate/default
+            c->idct_put              = ff_simple_idct_put_8;
+            c->idct_add              = ff_simple_idct_add_8;
+            c->idct                  = ff_simple_idct_8;
+            c->idct_permutation_type = FF_NO_IDCT_PERM;
+        }
+    }
+
+    c->put_pixels_clamped        = put_pixels_clamped_c;
+    c->put_signed_pixels_clamped = put_signed_pixels_clamped_c;
+    c->add_pixels_clamped        = add_pixels_clamped_c;
+
+    if (ARCH_ARM)
+        ff_idctdsp_init_arm(c, avctx, high_bit_depth);
+    if (ARCH_PPC)
+        ff_idctdsp_init_ppc(c, avctx, high_bit_depth);
+    if (ARCH_X86)
+        ff_idctdsp_init_x86(c, avctx, high_bit_depth);
+
+    ff_init_scantable_permutation(c->idct_permutation,
+                                  c->idct_permutation_type);
+}