avcodec/ffv1: template functions to allow data types different from int16_t

This is required for >= 16bit RGB support
I tried it without templates but its too much duplicated code

Signed-off-by: Michael Niedermayer <michael@niedermayer.cc>

1 files changed, 160 insertions, 0 deletions

diff --git a/libavcodec/ffv1dec_template.c b/libavcodec/ffv1dec_template.c
new file mode 100644
index 0000000..5894f93
--- /dev/null
+++ b/libavcodec/ffv1dec_template.c
@@ -0,0 +1,160 @@
+/*
+ * FFV1 decoder template
+ *
+ * Copyright (c) 2003-2016 Michael Niedermayer <michaelni@gmx.at>
+ *
+ * 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
+ */
+
+static av_always_inline void RENAME(decode_line)(FFV1Context *s, int w,
+                                                 TYPE *sample[2],
+                                                 int plane_index, int bits)
+{
+    PlaneContext *const p = &s->plane[plane_index];
+    RangeCoder *const c   = &s->c;
+    int x;
+    int run_count = 0;
+    int run_mode  = 0;
+    int run_index = s->run_index;
+
+    if (s->slice_coding_mode == 1) {
+        int i;
+        for (x = 0; x < w; x++) {
+            int v = 0;
+            for (i=0; i<bits; i++) {
+                uint8_t state = 128;
+                v += v + get_rac(c, &state);
+            }
+            sample[1][x] = v;
+        }
+        return;
+    }
+
+    for (x = 0; x < w; x++) {
+        int diff, context, sign;
+
+        context = RENAME(get_context)(p, sample[1] + x, sample[0] + x, sample[1] + x);
+        if (context < 0) {
+            context = -context;
+            sign    = 1;
+        } else
+            sign = 0;
+
+        av_assert2(context < p->context_count);
+
+        if (s->ac != AC_GOLOMB_RICE) {
+            diff = get_symbol_inline(c, p->state[context], 1);
+        } else {
+            if (context == 0 && run_mode == 0)
+                run_mode = 1;
+
+            if (run_mode) {
+                if (run_count == 0 && run_mode == 1) {
+                    if (get_bits1(&s->gb)) {
+                        run_count = 1 << ff_log2_run[run_index];
+                        if (x + run_count <= w)
+                            run_index++;
+                    } else {
+                        if (ff_log2_run[run_index])
+                            run_count = get_bits(&s->gb, ff_log2_run[run_index]);
+                        else
+                            run_count = 0;
+                        if (run_index)
+                            run_index--;
+                        run_mode = 2;
+                    }
+                }
+                run_count--;
+                if (run_count < 0) {
+                    run_mode  = 0;
+                    run_count = 0;
+                    diff      = get_vlc_symbol(&s->gb, &p->vlc_state[context],
+                                               bits);
+                    if (diff >= 0)
+                        diff++;
+                } else
+                    diff = 0;
+            } else
+                diff = get_vlc_symbol(&s->gb, &p->vlc_state[context], bits);
+
+            ff_dlog(s->avctx, "count:%d index:%d, mode:%d, x:%d pos:%d\n",
+                    run_count, run_index, run_mode, x, get_bits_count(&s->gb));
+        }
+
+        if (sign)
+            diff = -diff;
+
+        sample[1][x] = av_mod_uintp2(RENAME(predict)(sample[1] + x, sample[0] + x) + diff, bits);
+    }
+    s->run_index = run_index;
+}
+
+static void RENAME(decode_rgb_frame)(FFV1Context *s, uint8_t *src[3], int w, int h, int stride[3])
+{
+    int x, y, p;
+    TYPE *sample[4][2];
+    int lbd    = s->avctx->bits_per_raw_sample <= 8;
+    int bits   = s->avctx->bits_per_raw_sample > 0 ? s->avctx->bits_per_raw_sample : 8;
+    int offset = 1 << bits;
+
+    for (x = 0; x < 4; x++) {
+        sample[x][0] = RENAME(s->sample_buffer) +  x * 2      * (w + 6) + 3;
+        sample[x][1] = RENAME(s->sample_buffer) + (x * 2 + 1) * (w + 6) + 3;
+    }
+
+    s->run_index = 0;
+
+    memset(RENAME(s->sample_buffer), 0, 8 * (w + 6) * sizeof(*RENAME(s->sample_buffer)));
+
+    for (y = 0; y < h; y++) {
+        for (p = 0; p < 3 + s->transparency; p++) {
+            TYPE *temp = sample[p][0]; // FIXME: try a normal buffer
+
+            sample[p][0] = sample[p][1];
+            sample[p][1] = temp;
+
+            sample[p][1][-1]= sample[p][0][0  ];
+            sample[p][0][ w]= sample[p][0][w-1];
+            if (lbd && s->slice_coding_mode == 0)
+                RENAME(decode_line)(s, w, sample[p], (p + 1)/2, 9);
+            else
+                RENAME(decode_line)(s, w, sample[p], (p + 1)/2, bits + (s->slice_coding_mode != 1));
+        }
+        for (x = 0; x < w; x++) {
+            int g = sample[0][1][x];
+            int b = sample[1][1][x];
+            int r = sample[2][1][x];
+            int a = sample[3][1][x];
+
+            if (s->slice_coding_mode != 1) {
+                b -= offset;
+                r -= offset;
+                g -= (b * s->slice_rct_by_coef + r * s->slice_rct_ry_coef) >> 2;
+                b += g;
+                r += g;
+            }
+
+            if (lbd)
+                *((uint32_t*)(src[0] + x*4 + stride[0]*y)) = b + (g<<8) + (r<<16) + (a<<24);
+            else {
+                *((uint16_t*)(src[0] + x*2 + stride[0]*y)) = b;
+                *((uint16_t*)(src[1] + x*2 + stride[1]*y)) = g;
+                *((uint16_t*)(src[2] + x*2 + stride[2]*y)) = r;
+            }
+        }
+    }
+}