h264: use templates to avoid excessive inlining

Instead of inlining everything into ff_h264_hl_decode_mb(), use
explicit templating to create versions of the called functions
with constant parameters filled in.  This greatly speeds up
compilation of h264.c and reduces the code size without any
measurable impact on performance.

Compilation time for h264.c on an i7 goes from 30s to 5.5s.
Code size is reduced by 430kB.
Signed-off-by: Mans Rullgard <mans@mansr.com>

libavcodec/h264_mc_template.c

+/*
+ * H.26L/H.264/AVC/JVT/14496-10/... decoder
+ * Copyright (c) 2003 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * 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
+ */
+
+#undef MCFUNC
+
+#if   CHROMA_IDC == 1
+#   define MCFUNC(n) FUNC(n ## _420)
+#elif CHROMA_IDC == 2
+#   define MCFUNC(n) FUNC(n ## _422)
+#elif CHROMA_IDC == 3
+#   define MCFUNC(n) FUNC(n ## _444)
+#endif
+
+#undef  mc_part
+#define mc_part MCFUNC(mc_part)
+
+static void mc_part(H264Context *h, int n, int square,
+                    int height, int delta,
+                    uint8_t *dest_y, uint8_t *dest_cb,
+                    uint8_t *dest_cr,
+                    int x_offset, int y_offset,
+                    qpel_mc_func *qpix_put,
+                    h264_chroma_mc_func chroma_put,
+                    qpel_mc_func *qpix_avg,
+                    h264_chroma_mc_func chroma_avg,
+                    h264_weight_func *weight_op,
+                    h264_biweight_func *weight_avg,
+                    int list0, int list1)
+{
+    if ((h->use_weight == 2 && list0 && list1 &&
+         (h->implicit_weight[h->ref_cache[0][scan8[n]]][h->ref_cache[1][scan8[n]]][h->s.mb_y & 1] != 32)) ||
+        h->use_weight == 1)
+        mc_part_weighted(h, n, square, height, delta, dest_y, dest_cb, dest_cr,
+                         x_offset, y_offset, qpix_put, chroma_put,
+                         weight_op[0], weight_op[1], weight_avg[0],
+                         weight_avg[1], list0, list1, PIXEL_SHIFT, CHROMA_IDC);
+    else
+        mc_part_std(h, n, square, height, delta, dest_y, dest_cb, dest_cr,
+                    x_offset, y_offset, qpix_put, chroma_put, qpix_avg,
+                    chroma_avg, list0, list1, PIXEL_SHIFT, CHROMA_IDC);
+}
+
+static void MCFUNC(hl_motion)(H264Context *h, uint8_t *dest_y,
+                              uint8_t *dest_cb, uint8_t *dest_cr,
+                              qpel_mc_func(*qpix_put)[16],
+                              h264_chroma_mc_func(*chroma_put),
+                              qpel_mc_func(*qpix_avg)[16],
+                              h264_chroma_mc_func(*chroma_avg),
+                              h264_weight_func *weight_op,
+                              h264_biweight_func *weight_avg)
+{
+    MpegEncContext *const s = &h->s;
+    const int mb_xy   = h->mb_xy;
+    const int mb_type = s->current_picture.f.mb_type[mb_xy];
+
+    assert(IS_INTER(mb_type));
+
+    if (HAVE_THREADS && (s->avctx->active_thread_type & FF_THREAD_FRAME))
+        await_references(h);
+    prefetch_motion(h, 0, PIXEL_SHIFT, CHROMA_IDC);
+
+    if (IS_16X16(mb_type)) {
+        mc_part(h, 0, 1, 16, 0, dest_y, dest_cb, dest_cr, 0, 0,
+                qpix_put[0], chroma_put[0], qpix_avg[0], chroma_avg[0],
+                weight_op, weight_avg,
+                IS_DIR(mb_type, 0, 0), IS_DIR(mb_type, 0, 1));
+    } else if (IS_16X8(mb_type)) {
+        mc_part(h, 0, 0, 8, 8 << PIXEL_SHIFT, dest_y, dest_cb, dest_cr, 0, 0,
+                qpix_put[1], chroma_put[0], qpix_avg[1], chroma_avg[0],
+                weight_op, weight_avg,
+                IS_DIR(mb_type, 0, 0), IS_DIR(mb_type, 0, 1));
+        mc_part(h, 8, 0, 8, 8 << PIXEL_SHIFT, dest_y, dest_cb, dest_cr, 0, 4,
+                qpix_put[1], chroma_put[0], qpix_avg[1], chroma_avg[0],
+                weight_op, weight_avg,
+                IS_DIR(mb_type, 1, 0), IS_DIR(mb_type, 1, 1));
+    } else if (IS_8X16(mb_type)) {
+        mc_part(h, 0, 0, 16, 8 * h->mb_linesize, dest_y, dest_cb, dest_cr, 0, 0,
+                qpix_put[1], chroma_put[1], qpix_avg[1], chroma_avg[1],
+                &weight_op[1], &weight_avg[1],
+                IS_DIR(mb_type, 0, 0), IS_DIR(mb_type, 0, 1));
+        mc_part(h, 4, 0, 16, 8 * h->mb_linesize, dest_y, dest_cb, dest_cr, 4, 0,
+                qpix_put[1], chroma_put[1], qpix_avg[1], chroma_avg[1],
+                &weight_op[1], &weight_avg[1],
+                IS_DIR(mb_type, 1, 0), IS_DIR(mb_type, 1, 1));
+    } else {
+        int i;
+
+        assert(IS_8X8(mb_type));
+
+        for (i = 0; i < 4; i++) {
+            const int sub_mb_type = h->sub_mb_type[i];
+            const int n  = 4 * i;
+            int x_offset = (i & 1) << 2;
+            int y_offset = (i & 2) << 1;
+
+            if (IS_SUB_8X8(sub_mb_type)) {
+                mc_part(h, n, 1, 8, 0, dest_y, dest_cb, dest_cr,
+                        x_offset, y_offset,
+                        qpix_put[1], chroma_put[1], qpix_avg[1], chroma_avg[1],
+                        &weight_op[1], &weight_avg[1],
+                        IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1));
+            } else if (IS_SUB_8X4(sub_mb_type)) {
+                mc_part(h, n, 0, 4, 4 << PIXEL_SHIFT, dest_y, dest_cb, dest_cr,
+                        x_offset, y_offset,
+                        qpix_put[2], chroma_put[1], qpix_avg[2], chroma_avg[1],
+                        &weight_op[1], &weight_avg[1],
+                        IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1));
+                mc_part(h, n + 2, 0, 4, 4 << PIXEL_SHIFT,
+                        dest_y, dest_cb, dest_cr, x_offset, y_offset + 2,
+                        qpix_put[2], chroma_put[1], qpix_avg[2], chroma_avg[1],
+                        &weight_op[1], &weight_avg[1],
+                        IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1));
+            } else if (IS_SUB_4X8(sub_mb_type)) {
+                mc_part(h, n, 0, 8, 4 * h->mb_linesize,
+                        dest_y, dest_cb, dest_cr, x_offset, y_offset,
+                        qpix_put[2], chroma_put[2], qpix_avg[2], chroma_avg[2],
+                        &weight_op[2], &weight_avg[2],
+                        IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1));
+                mc_part(h, n + 1, 0, 8, 4 * h->mb_linesize,
+                        dest_y, dest_cb, dest_cr, x_offset + 2, y_offset,
+                        qpix_put[2], chroma_put[2], qpix_avg[2], chroma_avg[2],
+                        &weight_op[2], &weight_avg[2],
+                        IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1));
+            } else {
+                int j;
+                assert(IS_SUB_4X4(sub_mb_type));
+                for (j = 0; j < 4; j++) {
+                    int sub_x_offset = x_offset + 2 * (j & 1);
+                    int sub_y_offset = y_offset + (j & 2);
+                    mc_part(h, n + j, 1, 4, 0,
+                            dest_y, dest_cb, dest_cr, sub_x_offset, sub_y_offset,
+                            qpix_put[2], chroma_put[2], qpix_avg[2], chroma_avg[2],
+                            &weight_op[2], &weight_avg[2],
+                            IS_DIR(sub_mb_type, 0, 0), IS_DIR(sub_mb_type, 0, 1));
+                }
+            }
+        }
+    }
+
+    prefetch_motion(h, 1, PIXEL_SHIFT, CHROMA_IDC);
+}
+