swr: split out DSP functions.

DSP bits of swri_resample go into their own mini-DSP functions; DSP
init goes from a per-call branch in multiple_resample to a proper
DSP init routine; x86 bits go into x86/; swri_resample() moves out of
resample_template.c into resample.c because it's independent of DSP
code or sample type; multiple_resample() is simplified.

Signed-off-by: Michael Niedermayer <michaelni@gmx.at>

1 files changed, 66 insertions, 0 deletions

diff --git a/libswresample/resample.h b/libswresample/resample.h
new file mode 100644
index 0000000000..b159c7b432
--- /dev/null
+++ b/libswresample/resample.h
@@ -0,0 +1,66 @@
+/*
+ * audio resampling
+ * Copyright (c) 2004-2012 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
+ */
+
+#ifndef SWRESAMPLE_RESAMPLE_H
+#define SWRESAMPLE_RESAMPLE_H
+
+#include "libavutil/log.h"
+#include "libavutil/samplefmt.h"
+
+#include "swresample_internal.h"
+
+typedef void (*resample_one_fn)(uint8_t *dst, const uint8_t *src,
+                                int n, int64_t index, int64_t incr);
+typedef int (*resample_fn)(struct ResampleContext *c, uint8_t *dst,
+                           const uint8_t *src, int n, int update_ctx);
+
+typedef struct ResampleContext {
+    const AVClass *av_class;
+    uint8_t *filter_bank;
+    int filter_length;
+    int filter_alloc;
+    int ideal_dst_incr;
+    int dst_incr;
+    int index;
+    int frac;
+    int src_incr;
+    int compensation_distance;
+    int phase_shift;
+    int phase_mask;
+    int linear;
+    enum SwrFilterType filter_type;
+    int kaiser_beta;
+    double factor;
+    enum AVSampleFormat format;
+    int felem_size;
+    int filter_shift;
+
+    struct {
+        resample_one_fn resample_one[AV_SAMPLE_FMT_NB - AV_SAMPLE_FMT_S16P];
+        resample_fn resample_common[AV_SAMPLE_FMT_NB - AV_SAMPLE_FMT_S16P];
+        resample_fn resample_linear[AV_SAMPLE_FMT_NB - AV_SAMPLE_FMT_S16P];
+    } dsp;
+} ResampleContext;
+
+void swresample_dsp_init(ResampleContext *c);
+void swresample_dsp_x86_init(ResampleContext *c);
+
+#endif /* SWRESAMPLE_RESAMPLE_H */