lavfi: generic hardware surface upload and download filters

Signed-off-by: Anton Khirnov <anton@khirnov.net>

1 files changed, 241 insertions, 0 deletions

diff --git a/libavfilter/vf_hwupload.c b/libavfilter/vf_hwupload.c
new file mode 100644
index 0000000000..c438d5aac9
--- /dev/null
+++ b/libavfilter/vf_hwupload.c
@@ -0,0 +1,241 @@
+/*
+ * 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
+ */
+
+#include "libavutil/buffer.h"
+#include "libavutil/hwcontext.h"
+#include "libavutil/hwcontext_internal.h"
+#include "libavutil/log.h"
+#include "libavutil/pixdesc.h"
+#include "libavutil/opt.h"
+
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+typedef struct HWUploadContext {
+    const AVClass *class;
+
+    AVBufferRef       *hwdevice_ref;
+    AVHWDeviceContext *hwdevice;
+
+    AVBufferRef       *hwframes_ref;
+    AVHWFramesContext *hwframes;
+} HWUploadContext;
+
+static int hwupload_query_formats(AVFilterContext *avctx)
+{
+    HWUploadContext *ctx = avctx->priv;
+    AVHWFramesConstraints *constraints = NULL;
+    const enum AVPixelFormat *input_pix_fmts, *output_pix_fmts;
+    AVFilterFormats *input_formats = NULL;
+    int err, i;
+
+    if (!avctx->hw_device_ctx) {
+        av_log(ctx, AV_LOG_ERROR, "A hardware device reference is required "
+               "to upload frames to.\n");
+        return AVERROR(EINVAL);
+    }
+
+    ctx->hwdevice_ref = av_buffer_ref(avctx->hw_device_ctx);
+    if (!ctx->hwdevice_ref)
+        return AVERROR(ENOMEM);
+    ctx->hwdevice = (AVHWDeviceContext*)ctx->hwdevice_ref->data;
+
+    constraints = av_hwdevice_get_hwframe_constraints(ctx->hwdevice_ref, NULL);
+    if (!constraints) {
+        err = AVERROR(EINVAL);
+        goto fail;
+    }
+
+    input_pix_fmts  = constraints->valid_sw_formats;
+    output_pix_fmts = constraints->valid_hw_formats;
+
+    input_formats = ff_make_format_list(output_pix_fmts);
+    if (!input_formats) {
+        err = AVERROR(ENOMEM);
+        goto fail;
+    }
+    if (input_pix_fmts) {
+        for (i = 0; input_pix_fmts[i] != AV_PIX_FMT_NONE; i++) {
+            err = ff_add_format(&input_formats, input_pix_fmts[i]);
+            if (err < 0) {
+                ff_formats_unref(&input_formats);
+                goto fail;
+            }
+        }
+    }
+
+    ff_formats_ref(input_formats, &avctx->inputs[0]->out_formats);
+
+    ff_formats_ref(ff_make_format_list(output_pix_fmts),
+                   &avctx->outputs[0]->in_formats);
+
+    av_hwframe_constraints_free(&constraints);
+    return 0;
+
+fail:
+    av_buffer_unref(&ctx->hwdevice_ref);
+    av_hwframe_constraints_free(&constraints);
+    return err;
+}
+
+static int hwupload_config_output(AVFilterLink *outlink)
+{
+    AVFilterContext *avctx = outlink->src;
+    AVFilterLink   *inlink = avctx->inputs[0];
+    HWUploadContext   *ctx = avctx->priv;
+    int err;
+
+    av_buffer_unref(&ctx->hwframes_ref);
+
+    if (inlink->format == outlink->format) {
+        // The input is already a hardware format, so we just want to
+        // pass through the input frames in their own hardware context.
+        if (!inlink->hw_frames_ctx) {
+            av_log(ctx, AV_LOG_ERROR, "No input hwframe context.\n");
+            return AVERROR(EINVAL);
+        }
+
+        outlink->hw_frames_ctx = av_buffer_ref(inlink->hw_frames_ctx);
+        if (!outlink->hw_frames_ctx)
+            return AVERROR(ENOMEM);
+
+        return 0;
+    }
+
+    ctx->hwframes_ref = av_hwframe_ctx_alloc(ctx->hwdevice_ref);
+    if (!ctx->hwframes_ref)
+        return AVERROR(ENOMEM);
+
+    ctx->hwframes = (AVHWFramesContext*)ctx->hwframes_ref->data;
+
+    av_log(ctx, AV_LOG_DEBUG, "Surface format is %s.\n",
+           av_get_pix_fmt_name(inlink->format));
+
+    ctx->hwframes->format    = outlink->format;
+    ctx->hwframes->sw_format = inlink->format;
+    ctx->hwframes->width     = inlink->w;
+    ctx->hwframes->height    = inlink->h;
+
+    err = av_hwframe_ctx_init(ctx->hwframes_ref);
+    if (err < 0)
+        goto fail;
+
+    outlink->hw_frames_ctx = av_buffer_ref(ctx->hwframes_ref);
+    if (!outlink->hw_frames_ctx) {
+        err = AVERROR(ENOMEM);
+        goto fail;
+    }
+
+    return 0;
+
+fail:
+    av_buffer_unref(&ctx->hwframes_ref);
+    return err;
+}
+
+static int hwupload_filter_frame(AVFilterLink *link, AVFrame *input)
+{
+    AVFilterContext *avctx = link->dst;
+    AVFilterLink  *outlink = avctx->outputs[0];
+    HWUploadContext   *ctx = avctx->priv;
+    AVFrame *output = NULL;
+    int err;
+
+    if (input->format == outlink->format)
+        return ff_filter_frame(outlink, input);
+
+    output = av_frame_alloc();
+    if (!output) {
+        err = AVERROR(ENOMEM);
+        goto fail;
+    }
+
+    err = av_hwframe_get_buffer(ctx->hwframes_ref, output, 0);
+    if (err < 0) {
+        av_log(ctx, AV_LOG_ERROR, "Failed to allocate frame to upload to.\n");
+        goto fail;
+    }
+
+    output->width  = input->width;
+    output->height = input->height;
+
+    err = av_hwframe_transfer_data(output, input, 0);
+    if (err < 0) {
+        av_log(ctx, AV_LOG_ERROR, "Failed to upload frame: %d.\n", err);
+        goto fail;
+    }
+
+    err = av_frame_copy_props(output, input);
+    if (err < 0)
+        goto fail;
+
+    av_frame_free(&input);
+
+    return ff_filter_frame(outlink, output);
+
+fail:
+    av_frame_free(&input);
+    av_frame_free(&output);
+    return err;
+}
+
+static av_cold void hwupload_uninit(AVFilterContext *avctx)
+{
+    HWUploadContext *ctx = avctx->priv;
+
+    av_buffer_unref(&ctx->hwframes_ref);
+    av_buffer_unref(&ctx->hwdevice_ref);
+}
+
+static const AVClass hwupload_class = {
+    .class_name = "hwupload",
+    .item_name  = av_default_item_name,
+    .option     = NULL,
+    .version    = LIBAVUTIL_VERSION_INT,
+};
+
+static const AVFilterPad hwupload_inputs[] = {
+    {
+        .name         = "default",
+        .type         = AVMEDIA_TYPE_VIDEO,
+        .filter_frame = hwupload_filter_frame,
+    },
+    { NULL }
+};
+
+static const AVFilterPad hwupload_outputs[] = {
+    {
+        .name         = "default",
+        .type         = AVMEDIA_TYPE_VIDEO,
+        .config_props = hwupload_config_output,
+    },
+    { NULL }
+};
+
+AVFilter ff_vf_hwupload = {
+    .name          = "hwupload",
+    .description   = NULL_IF_CONFIG_SMALL("Upload a normal frame to a hardware frame"),
+    .uninit        = hwupload_uninit,
+    .query_formats = hwupload_query_formats,
+    .priv_size     = sizeof(HWUploadContext),
+    .priv_class    = &hwupload_class,
+    .inputs        = hwupload_inputs,
+    .outputs       = hwupload_outputs,
+};