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FFmpeg/libavfilter/vf_hwmap.c

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/*
* 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/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 *hwframes_ref;
int mode;
char *derive_device_type;
int reverse;
} HWMapContext;
static int hwmap_query_formats(AVFilterContext *avctx)
{
int ret;
if ((ret = ff_formats_ref(ff_all_formats(AVMEDIA_TYPE_VIDEO),
&avctx->inputs[0]->outcfg.formats)) < 0 ||
(ret = ff_formats_ref(ff_all_formats(AVMEDIA_TYPE_VIDEO),
&avctx->outputs[0]->incfg.formats)) < 0)
return ret;
return 0;
}
static int hwmap_config_output(AVFilterLink *outlink)
{
AVFilterContext *avctx = outlink->src;
HWMapContext *ctx = avctx->priv;
AVFilterLink *inlink = avctx->inputs[0];
AVHWFramesContext *hwfc;
AVBufferRef *device;
const AVPixFmtDescriptor *desc;
int err, device_is_derived;
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));
av_buffer_unref(&ctx->hwframes_ref);
device = avctx->hw_device_ctx;
device_is_derived = 0;
if (inlink->hw_frames_ctx) {
hwfc = (AVHWFramesContext*)inlink->hw_frames_ctx->data;
if (ctx->derive_device_type) {
enum AVHWDeviceType type;
type = av_hwdevice_find_type_by_name(ctx->derive_device_type);
if (type == AV_HWDEVICE_TYPE_NONE) {
av_log(avctx, AV_LOG_ERROR, "Invalid device type.\n");
err = AVERROR(EINVAL);
goto fail;
}
err = av_hwdevice_ctx_create_derived(&device, type,
hwfc->device_ref, 0);
if (err < 0) {
av_log(avctx, AV_LOG_ERROR, "Failed to created derived "
"device context: %d.\n", err);
goto fail;
}
device_is_derived = 1;
}
desc = av_pix_fmt_desc_get(outlink->format);
if (!desc) {
err = AVERROR(EINVAL);
goto fail;
}
if (inlink->format == hwfc->format &&
(desc->flags & AV_PIX_FMT_FLAG_HWACCEL) &&
!ctx->reverse) {
// Map between two hardware formats (including the case of
// undoing an existing mapping).
if (!device) {
av_log(avctx, AV_LOG_ERROR, "A device reference is "
"required to map to a hardware format.\n");
err = AVERROR(EINVAL);
goto fail;
}
err = av_hwframe_ctx_create_derived(&ctx->hwframes_ref,
outlink->format,
device,
inlink->hw_frames_ctx,
ctx->mode);
if (err < 0) {
av_log(avctx, AV_LOG_ERROR, "Failed to create derived "
"frames context: %d.\n", err);
goto fail;
}
} else if (inlink->format == hwfc->format &&
(desc->flags & AV_PIX_FMT_FLAG_HWACCEL) &&
ctx->reverse) {
// Map between two hardware formats, but do it in reverse.
// Make a new hwframe context for the target type, and then
// overwrite the input hwframe context with a derived context
// mapped from that back to the source type.
AVBufferRef *source;
AVHWFramesContext *frames;
ctx->hwframes_ref = av_hwframe_ctx_alloc(device);
if (!ctx->hwframes_ref) {
err = AVERROR(ENOMEM);
goto fail;
}
frames = (AVHWFramesContext*)ctx->hwframes_ref->data;
frames->format = outlink->format;
frames->sw_format = hwfc->sw_format;
frames->width = hwfc->width;
frames->height = hwfc->height;
if (avctx->extra_hw_frames >= 0)
frames->initial_pool_size = 2 + avctx->extra_hw_frames;
err = av_hwframe_ctx_init(ctx->hwframes_ref);
if (err < 0) {
av_log(avctx, AV_LOG_ERROR, "Failed to initialise "
"target frames context: %d.\n", err);
goto fail;
}
err = av_hwframe_ctx_create_derived(&source,
inlink->format,
hwfc->device_ref,
ctx->hwframes_ref,
ctx->mode);
if (err < 0) {
av_log(avctx, AV_LOG_ERROR, "Failed to create "
"derived source frames context: %d.\n", err);
goto fail;
}
// Here is the naughty bit. This overwriting changes what
// ff_get_video_buffer() in the previous filter returns -
// it will now give a frame allocated here mapped back to
// the format it expects. If there were any additional
// constraints on the output frames there then this may
// break nastily.
av_buffer_unref(&inlink->hw_frames_ctx);
inlink->hw_frames_ctx = source;
} 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->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.
if (!device) {
av_log(avctx, AV_LOG_ERROR, "A device reference is "
"required to create new frames with reverse "
"mapping.\n");
err = AVERROR(EINVAL);
goto fail;
}
ctx->reverse = 1;
ctx->hwframes_ref = av_hwframe_ctx_alloc(device);
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;
if (avctx->extra_hw_frames >= 0)
hwfc->initial_pool_size = 2 + avctx->extra_hw_frames;
err = av_hwframe_ctx_init(ctx->hwframes_ref);
if (err < 0) {
av_log(avctx, AV_LOG_ERROR, "Failed to create frame "
"context for reverse 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;
if (device_is_derived)
av_buffer_unref(&device);
return 0;
fail:
if (device_is_derived)
av_buffer_unref(&device);
av_buffer_unref(&ctx->hwframes_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->reverse && !inlink->hw_frames_ctx) {
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->reverse && !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);
}
#define OFFSET(x) offsetof(HWMapContext, x)
#define FLAGS (AV_OPT_FLAG_FILTERING_PARAM|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, .unit = "mode" },
{ "read", "Mapping should be readable",
0, AV_OPT_TYPE_CONST, { .i64 = AV_HWFRAME_MAP_READ },
INT_MIN, INT_MAX, FLAGS, .unit = "mode" },
{ "write", "Mapping should be writeable",
0, AV_OPT_TYPE_CONST, { .i64 = AV_HWFRAME_MAP_WRITE },
INT_MIN, INT_MAX, FLAGS, .unit = "mode" },
{ "overwrite", "Mapping will always overwrite the entire frame",
0, AV_OPT_TYPE_CONST, { .i64 = AV_HWFRAME_MAP_OVERWRITE },
INT_MIN, INT_MAX, FLAGS, .unit = "mode" },
{ "direct", "Mapping should not involve any copying",
0, AV_OPT_TYPE_CONST, { .i64 = AV_HWFRAME_MAP_DIRECT },
INT_MIN, INT_MAX, FLAGS, .unit = "mode" },
{ "derive_device", "Derive a new device of this type",
OFFSET(derive_device_type), AV_OPT_TYPE_STRING,
{ .str = NULL }, 0, 0, FLAGS },
{ "reverse", "Map in reverse (create and allocate in the sink)",
OFFSET(reverse), AV_OPT_TYPE_INT,
{ .i64 = 0 }, 0, 1, FLAGS },
{ NULL }
};
AVFILTER_DEFINE_CLASS(hwmap);
static const AVFilterPad hwmap_inputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.get_buffer.video = hwmap_get_buffer,
.filter_frame = hwmap_filter_frame,
},
};
static const AVFilterPad hwmap_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = hwmap_config_output,
},
};
const 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,
2021-08-12 13:05:31 +02:00
FILTER_INPUTS(hwmap_inputs),
FILTER_OUTPUTS(hwmap_outputs),
avfilter: Replace query_formats callback with union of list and callback If one looks at the many query_formats callbacks in existence, one will immediately recognize that there is one type of default callback for video and a slightly different default callback for audio: It is "return ff_set_common_formats_from_list(ctx, pix_fmts);" for video with a filter-specific pix_fmts list. For audio, it is the same with a filter-specific sample_fmts list together with ff_set_common_all_samplerates() and ff_set_common_all_channel_counts(). This commit allows to remove the boilerplate query_formats callbacks by replacing said callback with a union consisting the old callback and pointers for pixel and sample format arrays. For the not uncommon case in which these lists only contain a single entry (besides the sentinel) enum AVPixelFormat and enum AVSampleFormat fields are also added to the union to store them directly in the AVFilter, thereby avoiding a relocation. The state of said union will be contained in a new, dedicated AVFilter field (the nb_inputs and nb_outputs fields have been shrunk to uint8_t in order to create a hole for this new field; this is no problem, as the maximum of all the nb_inputs is four; for nb_outputs it is only two). The state's default value coincides with the earlier default of query_formats being unset, namely that the filter accepts all formats (and also sample rates and channel counts/layouts for audio) provided that these properties agree coincide for all inputs and outputs. By using different union members for audio and video filters the type-unsafety of using the same functions for audio and video lists will furthermore be more confined to formats.c than before. When the new fields are used, they will also avoid allocations: Currently something nearly equivalent to ff_default_query_formats() is called after every successful call to a query_formats callback; yet in the common case that the newly allocated AVFilterFormats are not used at all (namely if there are no free links) these newly allocated AVFilterFormats are freed again without ever being used. Filters no longer using the callback will not exhibit this any more. Reviewed-by: Paul B Mahol <onemda@gmail.com> Reviewed-by: Nicolas George <george@nsup.org> Signed-off-by: Andreas Rheinhardt <andreas.rheinhardt@outlook.com>
2021-09-27 12:07:35 +02:00
FILTER_QUERY_FUNC(hwmap_query_formats),
.flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE,
.flags = AVFILTER_FLAG_HWDEVICE,
};