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-rw-r--r--libavfilter/vf_hwmap.c335
1 files changed, 335 insertions, 0 deletions
diff --git a/libavfilter/vf_hwmap.c b/libavfilter/vf_hwmap.c
new file mode 100644
index 0000000000..11595bd6ca
--- /dev/null
+++ b/libavfilter/vf_hwmap.c
@@ -0,0 +1,335 @@
+/*
+ * 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/log.h"
+#include "libavutil/opt.h"
+#include "libavutil/pixdesc.h"
+
+#include "avfilter.h"
+#include "formats.h"
+#include "internal.h"
+#include "video.h"
+
+typedef struct HWMapContext {
+ const AVClass *class;
+
+ AVBufferRef *hwdevice_ref;
+ AVBufferRef *hwframes_ref;
+
+ int mode;
+ int map_backwards;
+} HWMapContext;
+
+static int hwmap_query_formats(AVFilterContext *avctx)
+{
+ ff_formats_ref(ff_all_formats(AVMEDIA_TYPE_VIDEO),
+ &avctx->inputs[0]->out_formats);
+ ff_formats_ref(ff_all_formats(AVMEDIA_TYPE_VIDEO),
+ &avctx->outputs[0]->in_formats);
+ return 0;
+}
+
+static int hwmap_config_output(AVFilterLink *outlink)
+{
+ AVFilterContext *avctx = outlink->src;
+ HWMapContext *ctx = avctx->priv;
+ AVFilterLink *inlink = avctx->inputs[0];
+ AVHWFramesContext *hwfc;
+ const AVPixFmtDescriptor *desc;
+ int err;
+
+ av_log(avctx, AV_LOG_DEBUG, "Configure hwmap %s -> %s.\n",
+ av_get_pix_fmt_name(inlink->format),
+ av_get_pix_fmt_name(outlink->format));
+
+ if (inlink->hw_frames_ctx) {
+ hwfc = (AVHWFramesContext*)inlink->hw_frames_ctx->data;
+
+ desc = av_pix_fmt_desc_get(outlink->format);
+ if (!desc)
+ return AVERROR(EINVAL);
+
+ if (inlink->format == hwfc->format &&
+ (desc->flags & AV_PIX_FMT_FLAG_HWACCEL)) {
+ // Map between two hardware formats (including the case of
+ // undoing an existing mapping).
+
+ ctx->hwdevice_ref = av_buffer_ref(avctx->hw_device_ctx);
+ if (!ctx->hwdevice_ref) {
+ err = AVERROR(ENOMEM);
+ goto fail;
+ }
+
+ err = av_hwframe_ctx_create_derived(&ctx->hwframes_ref,
+ outlink->format,
+ ctx->hwdevice_ref,
+ inlink->hw_frames_ctx, 0);
+ if (err < 0)
+ goto fail;
+
+ } else if ((outlink->format == hwfc->format &&
+ inlink->format == hwfc->sw_format) ||
+ inlink->format == hwfc->format) {
+ // Map from a hardware format to a software format, or
+ // undo an existing such mapping.
+
+ ctx->hwdevice_ref = NULL;
+
+ ctx->hwframes_ref = av_buffer_ref(inlink->hw_frames_ctx);
+ if (!ctx->hwframes_ref) {
+ err = AVERROR(ENOMEM);
+ goto fail;
+ }
+
+ } else {
+ // Non-matching formats - not supported.
+
+ av_log(avctx, AV_LOG_ERROR, "Unsupported formats for "
+ "hwmap: from %s (%s) to %s.\n",
+ av_get_pix_fmt_name(inlink->format),
+ av_get_pix_fmt_name(hwfc->format),
+ av_get_pix_fmt_name(outlink->format));
+ err = AVERROR(EINVAL);
+ goto fail;
+ }
+ } else if (avctx->hw_device_ctx) {
+ // Map from a software format to a hardware format. This
+ // creates a new hwframe context like hwupload, but then
+ // returns frames mapped from that to the previous link in
+ // order to fill them without an additional copy.
+
+ ctx->map_backwards = 1;
+
+ ctx->hwdevice_ref = av_buffer_ref(avctx->hw_device_ctx);
+ if (!ctx->hwdevice_ref) {
+ err = AVERROR(ENOMEM);
+ goto fail;
+ }
+
+ ctx->hwframes_ref = av_hwframe_ctx_alloc(ctx->hwdevice_ref);
+ if (!ctx->hwframes_ref) {
+ err = AVERROR(ENOMEM);
+ goto fail;
+ }
+ hwfc = (AVHWFramesContext*)ctx->hwframes_ref->data;
+
+ hwfc->format = outlink->format;
+ hwfc->sw_format = inlink->format;
+ hwfc->width = inlink->w;
+ hwfc->height = inlink->h;
+
+ err = av_hwframe_ctx_init(ctx->hwframes_ref);
+ if (err < 0) {
+ av_log(avctx, AV_LOG_ERROR, "Failed to create frame "
+ "context for backward mapping: %d.\n", err);
+ goto fail;
+ }
+
+ } else {
+ av_log(avctx, AV_LOG_ERROR, "Mapping requires a hardware "
+ "context (a device, or frames on input).\n");
+ return AVERROR(EINVAL);
+ }
+
+ outlink->hw_frames_ctx = av_buffer_ref(ctx->hwframes_ref);
+ if (!outlink->hw_frames_ctx) {
+ err = AVERROR(ENOMEM);
+ goto fail;
+ }
+
+ outlink->w = inlink->w;
+ outlink->h = inlink->h;
+
+ return 0;
+
+fail:
+ av_buffer_unref(&ctx->hwframes_ref);
+ av_buffer_unref(&ctx->hwdevice_ref);
+ return err;
+}
+
+static AVFrame *hwmap_get_buffer(AVFilterLink *inlink, int w, int h)
+{
+ AVFilterContext *avctx = inlink->dst;
+ AVFilterLink *outlink = avctx->outputs[0];
+ HWMapContext *ctx = avctx->priv;
+
+ if (ctx->map_backwards) {
+ AVFrame *src, *dst;
+ int err;
+
+ src = ff_get_video_buffer(outlink, w, h);
+ if (!src) {
+ av_log(avctx, AV_LOG_ERROR, "Failed to allocate source "
+ "frame for software mapping.\n");
+ return NULL;
+ }
+
+ dst = av_frame_alloc();
+ if (!dst) {
+ av_frame_free(&src);
+ return NULL;
+ }
+
+ err = av_hwframe_map(dst, src, ctx->mode);
+ if (err) {
+ av_log(avctx, AV_LOG_ERROR, "Failed to map frame to "
+ "software: %d.\n", err);
+ av_frame_free(&src);
+ av_frame_free(&dst);
+ return NULL;
+ }
+
+ av_frame_free(&src);
+ return dst;
+ } else {
+ return ff_default_get_video_buffer(inlink, w, h);
+ }
+}
+
+static int hwmap_filter_frame(AVFilterLink *link, AVFrame *input)
+{
+ AVFilterContext *avctx = link->dst;
+ AVFilterLink *outlink = avctx->outputs[0];
+ HWMapContext *ctx = avctx->priv;
+ AVFrame *map = NULL;
+ int err;
+
+ av_log(ctx, AV_LOG_DEBUG, "Filter input: %s, %ux%u (%"PRId64").\n",
+ av_get_pix_fmt_name(input->format),
+ input->width, input->height, input->pts);
+
+ map = av_frame_alloc();
+ if (!map) {
+ err = AVERROR(ENOMEM);
+ goto fail;
+ }
+
+ map->format = outlink->format;
+ map->hw_frames_ctx = av_buffer_ref(ctx->hwframes_ref);
+ if (!map->hw_frames_ctx) {
+ err = AVERROR(ENOMEM);
+ goto fail;
+ }
+
+ if (ctx->map_backwards && !input->hw_frames_ctx) {
+ // If we mapped backwards from hardware to software, we need
+ // to attach the hardware frame context to the input frame to
+ // make the mapping visible to av_hwframe_map().
+ input->hw_frames_ctx = av_buffer_ref(ctx->hwframes_ref);
+ if (!input->hw_frames_ctx) {
+ err = AVERROR(ENOMEM);
+ goto fail;
+ }
+ }
+
+ err = av_hwframe_map(map, input, ctx->mode);
+ if (err < 0) {
+ av_log(avctx, AV_LOG_ERROR, "Failed to map frame: %d.\n", err);
+ goto fail;
+ }
+
+ err = av_frame_copy_props(map, input);
+ if (err < 0)
+ goto fail;
+
+ av_frame_free(&input);
+
+ av_log(ctx, AV_LOG_DEBUG, "Filter output: %s, %ux%u (%"PRId64").\n",
+ av_get_pix_fmt_name(map->format),
+ map->width, map->height, map->pts);
+
+ return ff_filter_frame(outlink, map);
+
+fail:
+ av_frame_free(&input);
+ av_frame_free(&map);
+ return err;
+}
+
+static av_cold void hwmap_uninit(AVFilterContext *avctx)
+{
+ HWMapContext *ctx = avctx->priv;
+
+ av_buffer_unref(&ctx->hwframes_ref);
+ av_buffer_unref(&ctx->hwdevice_ref);
+}
+
+#define OFFSET(x) offsetof(HWMapContext, x)
+#define FLAGS (AV_OPT_FLAG_VIDEO_PARAM)
+static const AVOption hwmap_options[] = {
+ { "mode", "Frame mapping mode",
+ OFFSET(mode), AV_OPT_TYPE_FLAGS,
+ { .i64 = AV_HWFRAME_MAP_READ | AV_HWFRAME_MAP_WRITE },
+ 0, INT_MAX, FLAGS, "mode" },
+
+ { "read", "Mapping should be readable",
+ 0, AV_OPT_TYPE_CONST, { .i64 = AV_HWFRAME_MAP_READ },
+ INT_MIN, INT_MAX, FLAGS, "mode" },
+ { "write", "Mapping should be writeable",
+ 0, AV_OPT_TYPE_CONST, { .i64 = AV_HWFRAME_MAP_WRITE },
+ INT_MIN, INT_MAX, FLAGS, "mode" },
+ { "overwrite", "Mapping will always overwrite the entire frame",
+ 0, AV_OPT_TYPE_CONST, { .i64 = AV_HWFRAME_MAP_OVERWRITE },
+ INT_MIN, INT_MAX, FLAGS, "mode" },
+ { "direct", "Mapping should not involve any copying",
+ 0, AV_OPT_TYPE_CONST, { .i64 = AV_HWFRAME_MAP_DIRECT },
+ INT_MIN, INT_MAX, FLAGS, "mode" },
+
+ { NULL },
+};
+
+static const AVClass hwmap_class = {
+ .class_name = "hwmap",
+ .item_name = av_default_item_name,
+ .option = hwmap_options,
+ .version = LIBAVUTIL_VERSION_INT,
+};
+
+static const AVFilterPad hwmap_inputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .get_video_buffer = &hwmap_get_buffer,
+ .filter_frame = &hwmap_filter_frame,
+ },
+ { NULL }
+};
+
+static const AVFilterPad hwmap_outputs[] = {
+ {
+ .name = "default",
+ .type = AVMEDIA_TYPE_VIDEO,
+ .config_props = &hwmap_config_output,
+ },
+ { NULL }
+};
+
+AVFilter ff_vf_hwmap = {
+ .name = "hwmap",
+ .description = NULL_IF_CONFIG_SMALL("Map hardware frames"),
+ .uninit = &hwmap_uninit,
+ .priv_size = sizeof(HWMapContext),
+ .priv_class = &hwmap_class,
+ .query_formats = &hwmap_query_formats,
+ .inputs = hwmap_inputs,
+ .outputs = hwmap_outputs,
+ .flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE,
+};
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-07 07:37:30 +0000