avfilter: rename vf_reverse.c to f_reverse.c

Signed-off-by: Paul B Mahol <onemda@gmail.com>

1 files changed, 259 insertions, 0 deletions

diff --git a/libavfilter/f_reverse.c b/libavfilter/f_reverse.c
new file mode 100644
index 0000000000..10529dfc5b
--- /dev/null
+++ b/libavfilter/f_reverse.c
@@ -0,0 +1,259 @@
+/*
+ * Copyright (c) 2015 Derek Buitenhuis
+ *
+ * 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
+ */
+
+#include "libavutil/opt.h"
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+#define DEFAULT_LENGTH 300
+
+typedef struct ReverseContext {
+    int nb_frames;
+    AVFrame **frames;
+    unsigned int frames_size;
+    unsigned int pts_size;
+    int64_t *pts;
+    int flush_idx;
+} ReverseContext;
+
+static av_cold int init(AVFilterContext *ctx)
+{
+    ReverseContext *s = ctx->priv;
+
+    s->pts = av_fast_realloc(NULL, &s->pts_size,
+                             DEFAULT_LENGTH * sizeof(*(s->pts)));
+    if (!s->pts)
+        return AVERROR(ENOMEM);
+
+    s->frames = av_fast_realloc(NULL, &s->frames_size,
+                                DEFAULT_LENGTH * sizeof(*(s->frames)));
+    if (!s->frames) {
+        av_freep(&s->pts);
+        return AVERROR(ENOMEM);
+    }
+
+    return 0;
+}
+
+static av_cold void uninit(AVFilterContext *ctx)
+{
+    ReverseContext *s = ctx->priv;
+
+    av_freep(&s->pts);
+    av_freep(&s->frames);
+}
+
+static int config_output(AVFilterLink *outlink)
+{
+    outlink->flags |= FF_LINK_FLAG_REQUEST_LOOP;
+    return 0;
+}
+
+static int filter_frame(AVFilterLink *inlink, AVFrame *in)
+{
+    AVFilterContext *ctx = inlink->dst;
+    ReverseContext *s    = ctx->priv;
+    void *ptr;
+
+    if (s->nb_frames + 1 > s->pts_size / sizeof(*(s->pts))) {
+        ptr = av_fast_realloc(s->pts, &s->pts_size, s->pts_size * 2);
+        if (!ptr)
+            return AVERROR(ENOMEM);
+        s->pts = ptr;
+    }
+
+    if (s->nb_frames + 1 > s->frames_size / sizeof(*(s->frames))) {
+        ptr = av_fast_realloc(s->frames, &s->frames_size, s->frames_size * 2);
+        if (!ptr)
+            return AVERROR(ENOMEM);
+        s->frames = ptr;
+    }
+
+    s->frames[s->nb_frames] = in;
+    s->pts[s->nb_frames]    = in->pts;
+    s->nb_frames++;
+
+    return 0;
+}
+
+#if CONFIG_REVERSE_FILTER
+
+static int request_frame(AVFilterLink *outlink)
+{
+    AVFilterContext *ctx = outlink->src;
+    ReverseContext *s = ctx->priv;
+    int ret;
+
+    ret = ff_request_frame(ctx->inputs[0]);
+
+    if (ret == AVERROR_EOF && s->nb_frames > 0) {
+        AVFrame *out = s->frames[s->nb_frames - 1];
+        out->pts     = s->pts[s->flush_idx++];
+        ret          = ff_filter_frame(outlink, out);
+        s->nb_frames--;
+    }
+
+    return ret;
+}
+
+static const AVFilterPad reverse_inputs[] = {
+    {
+        .name         = "default",
+        .type         = AVMEDIA_TYPE_VIDEO,
+        .filter_frame = filter_frame,
+    },
+    { NULL }
+};
+
+static const AVFilterPad reverse_outputs[] = {
+    {
+        .name          = "default",
+        .type          = AVMEDIA_TYPE_VIDEO,
+        .request_frame = request_frame,
+        .config_props  = config_output,
+    },
+    { NULL }
+};
+
+AVFilter ff_vf_reverse = {
+    .name        = "reverse",
+    .description = NULL_IF_CONFIG_SMALL("Reverse a clip."),
+    .priv_size   = sizeof(ReverseContext),
+    .init        = init,
+    .uninit      = uninit,
+    .inputs      = reverse_inputs,
+    .outputs     = reverse_outputs,
+};
+
+#endif /* CONFIG_REVERSE_FILTER */
+
+#if CONFIG_AREVERSE_FILTER
+
+static int query_formats(AVFilterContext *ctx)
+{
+    AVFilterFormats *formats;
+    AVFilterChannelLayouts *layouts;
+    int ret;
+
+    layouts = ff_all_channel_layouts();
+    if (!layouts)
+        return AVERROR(ENOMEM);
+    ret = ff_set_common_channel_layouts(ctx, layouts);
+    if (ret < 0)
+        return ret;
+
+    ret = ff_set_common_formats(ctx, ff_planar_sample_fmts());
+    if (ret < 0)
+        return ret;
+
+    formats = ff_all_samplerates();
+    if (!formats)
+        return AVERROR(ENOMEM);
+    return ff_set_common_samplerates(ctx, formats);
+}
+
+static int areverse_request_frame(AVFilterLink *outlink)
+{
+    AVFilterContext *ctx = outlink->src;
+    ReverseContext *s = ctx->priv;
+    int ret, p, i, j;
+
+    ret = ff_request_frame(ctx->inputs[0]);
+
+    if (ret == AVERROR_EOF && s->nb_frames > 0) {
+        AVFrame *out = s->frames[s->nb_frames - 1];
+        out->pts     = s->pts[s->flush_idx++];
+
+        for (p = 0; p < outlink->channels; p++) {
+            switch (outlink->format) {
+            case AV_SAMPLE_FMT_U8P: {
+                uint8_t *dst = (uint8_t *)out->extended_data[p];
+                for (i = 0, j = out->nb_samples - 1; i < j; i++, j--)
+                    FFSWAP(uint8_t, dst[i], dst[j]);
+            }
+                break;
+            case AV_SAMPLE_FMT_S16P: {
+                int16_t *dst = (int16_t *)out->extended_data[p];
+                for (i = 0, j = out->nb_samples - 1; i < j; i++, j--)
+                    FFSWAP(int16_t, dst[i], dst[j]);
+            }
+                break;
+            case AV_SAMPLE_FMT_S32P: {
+                int32_t *dst = (int32_t *)out->extended_data[p];
+                for (i = 0, j = out->nb_samples - 1; i < j; i++, j--)
+                    FFSWAP(int32_t, dst[i], dst[j]);
+            }
+                break;
+            case AV_SAMPLE_FMT_FLTP: {
+                float *dst = (float *)out->extended_data[p];
+                for (i = 0, j = out->nb_samples - 1; i < j; i++, j--)
+                    FFSWAP(float, dst[i], dst[j]);
+            }
+                break;
+            case AV_SAMPLE_FMT_DBLP: {
+                double *dst = (double *)out->extended_data[p];
+                for (i = 0, j = out->nb_samples - 1; i < j; i++, j--)
+                    FFSWAP(double, dst[i], dst[j]);
+            }
+                break;
+            }
+        }
+
+        ret = ff_filter_frame(outlink, out);
+        s->nb_frames--;
+    }
+
+    return ret;
+}
+
+static const AVFilterPad areverse_inputs[] = {
+    {
+        .name           = "default",
+        .type           = AVMEDIA_TYPE_AUDIO,
+        .filter_frame   = filter_frame,
+        .needs_writable = 1,
+    },
+    { NULL }
+};
+
+static const AVFilterPad areverse_outputs[] = {
+    {
+        .name          = "default",
+        .type          = AVMEDIA_TYPE_AUDIO,
+        .request_frame = areverse_request_frame,
+        .config_props  = config_output,
+    },
+    { NULL }
+};
+
+AVFilter ff_af_areverse = {
+    .name          = "areverse",
+    .description   = NULL_IF_CONFIG_SMALL("Reverse an audio clip."),
+    .query_formats = query_formats,
+    .priv_size     = sizeof(ReverseContext),
+    .init          = init,
+    .uninit        = uninit,
+    .inputs        = areverse_inputs,
+    .outputs       = areverse_outputs,
+};
+
+#endif /* CONFIG_AREVERSE_FILTER */