lavfi: add pp filter.

Ported from MPlayer. Original author is A'rpi, with various
contributions from Michael Niedermayer. The original documentation was
mostly written by Diego Biurrun. See the MPlayer history for full
credits.

The filter is under GPL like the original filter, even if it differs
quite a lot. There is not much point in making it LGPL since pp is under
GPL.

1 files changed, 172 insertions, 0 deletions

diff --git a/libavfilter/vf_pp.c b/libavfilter/vf_pp.c
new file mode 100644
index 0000000000..bde5ebf3ce
--- /dev/null
+++ b/libavfilter/vf_pp.c
@@ -0,0 +1,172 @@
+/*
+ * Copyright (c) 2002 A'rpi
+ * Copyright (C) 2012 Clément Bœsch
+ *
+ * This file is part of FFmpeg.
+ *
+ * FFmpeg is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU 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.
+ */
+
+/**
+ * @file
+ * libpostproc filter, ported from MPlayer.
+ */
+
+#include "libavutil/avassert.h"
+#include "libavutil/opt.h"
+#include "internal.h"
+
+#include "libpostproc/postprocess.h"
+
+typedef struct {
+    int mode_id;
+    pp_mode *modes[PP_QUALITY_MAX + 1];
+    void *pp_ctx;
+} PPFilterContext;
+
+static av_cold int pp_init(AVFilterContext *ctx, const char *args)
+{
+    int i;
+    PPFilterContext *pp = ctx->priv;
+
+    if (!args || !*args)
+        args = "de";
+
+    for (i = 0; i <= PP_QUALITY_MAX; i++) {
+        pp->modes[i] = pp_get_mode_by_name_and_quality(args, i);
+        if (!pp->modes[i])
+            return AVERROR_EXTERNAL;
+    }
+    pp->mode_id = PP_QUALITY_MAX;
+    return 0;
+}
+
+static int pp_process_command(AVFilterContext *ctx, const char *cmd, const char *args,
+                              char *res, int res_len, int flags)
+{
+    PPFilterContext *pp = ctx->priv;
+
+    if (!strcmp(cmd, "quality")) {
+        pp->mode_id = av_clip(strtol(args, NULL, 10), 0, PP_QUALITY_MAX);
+        return 0;
+    }
+    return AVERROR(ENOSYS);
+}
+
+static int pp_query_formats(AVFilterContext *ctx)
+{
+    static const enum PixelFormat pix_fmts[] = {
+        AV_PIX_FMT_YUV420P, AV_PIX_FMT_YUVJ420P,
+        AV_PIX_FMT_YUV422P, AV_PIX_FMT_YUVJ422P,
+        AV_PIX_FMT_YUV411P,
+        AV_PIX_FMT_YUV444P, AV_PIX_FMT_YUVJ444P,
+        AV_PIX_FMT_NONE
+    };
+    ff_set_common_formats(ctx, ff_make_format_list(pix_fmts));
+    return 0;
+}
+
+static int pp_config_props(AVFilterLink *inlink)
+{
+    int flags = PP_CPU_CAPS_AUTO;
+    PPFilterContext *pp = inlink->dst->priv;
+
+    switch (inlink->format) {
+    case AV_PIX_FMT_YUVJ420P:
+    case AV_PIX_FMT_YUV420P: flags |= PP_FORMAT_420; break;
+    case AV_PIX_FMT_YUVJ422P:
+    case AV_PIX_FMT_YUV422P: flags |= PP_FORMAT_422; break;
+    case AV_PIX_FMT_YUV411P: flags |= PP_FORMAT_411; break;
+    case AV_PIX_FMT_YUVJ444P:
+    case AV_PIX_FMT_YUV444P: flags |= PP_FORMAT_444; break;
+    default: av_assert0(0);
+    }
+
+    pp->pp_ctx = pp_get_context(inlink->w, inlink->h, flags);
+    if (!pp->pp_ctx)
+        return AVERROR(ENOMEM);
+    return 0;
+}
+
+static int pp_filter_frame(AVFilterLink *inlink, AVFilterBufferRef *inbuf)
+{
+    AVFilterContext *ctx = inlink->dst;
+    PPFilterContext *pp = ctx->priv;
+    AVFilterLink *outlink = ctx->outputs[0];
+    const int aligned_w = FFALIGN(outlink->w, 8);
+    const int aligned_h = FFALIGN(outlink->h, 8);
+    AVFilterBufferRef *outbuf;
+
+    outbuf = ff_get_video_buffer(outlink, AV_PERM_WRITE, aligned_w, aligned_h);
+    if (!outbuf) {
+        avfilter_unref_buffer(inbuf);
+        return AVERROR(ENOMEM);
+    }
+    avfilter_copy_buffer_ref_props(outbuf, inbuf);
+
+    pp_postprocess((const uint8_t **)inbuf->data, inbuf->linesize,
+                   outbuf->data,                 outbuf->linesize,
+                   aligned_w, outlink->h,
+                   outbuf->video->qp_table,
+                   outbuf->video->qp_table_linesize,
+                   pp->modes[pp->mode_id],
+                   pp->pp_ctx,
+                   outbuf->video->pict_type);
+
+    avfilter_unref_buffer(inbuf);
+    return ff_filter_frame(outlink, outbuf);
+}
+
+static av_cold void pp_uninit(AVFilterContext *ctx)
+{
+    int i;
+    PPFilterContext *pp = ctx->priv;
+
+    for (i = 0; i <= PP_QUALITY_MAX; i++)
+        pp_free_mode(pp->modes[i]);
+    if (pp->pp_ctx)
+        pp_free_context(pp->pp_ctx);
+}
+
+static const AVFilterPad pp_inputs[] = {
+    {
+        .name         = "default",
+        .type         = AVMEDIA_TYPE_VIDEO,
+        .config_props = pp_config_props,
+        .filter_frame = pp_filter_frame,
+        .min_perms    = AV_PERM_READ,
+    },
+    { NULL }
+};
+
+static const AVFilterPad pp_outputs[] = {
+    {
+        .name = "default",
+        .type = AVMEDIA_TYPE_VIDEO,
+    },
+    { NULL }
+};
+
+AVFilter avfilter_vf_pp = {
+    .name            = "pp",
+    .description     = NULL_IF_CONFIG_SMALL("Filter video using libpostproc."),
+    .priv_size       = sizeof(PPFilterContext),
+    .init            = pp_init,
+    .uninit          = pp_uninit,
+    .query_formats   = pp_query_formats,
+    .inputs          = pp_inputs,
+    .outputs         = pp_outputs,
+    .process_command = pp_process_command,
+};