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ffmpeg/libavfilter/vf_overlay_cuda.c

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/*
* Copyright (c) 2020 Yaroslav Pogrebnyak <yyyaroslav@gmail.com>
*
* 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
*/
/**
* @file
* Overlay one video on top of another using cuda hardware acceleration
*/
#include "libavutil/log.h"
#include "libavutil/opt.h"
#include "libavutil/pixdesc.h"
#include "libavutil/hwcontext.h"
#include "libavutil/hwcontext_cuda_internal.h"
#include "libavutil/cuda_check.h"
#include "libavutil/eval.h"
#include "avfilter.h"
#include "filters.h"
#include "framesync.h"
#include "internal.h"
#include "cuda/load_helper.h"
#define CHECK_CU(x) FF_CUDA_CHECK_DL(ctx, ctx->hwctx->internal->cuda_dl, x)
#define DIV_UP(a, b) ( ((a) + (b) - 1) / (b) )
#define BLOCK_X 32
#define BLOCK_Y 16
#define MAIN 0
#define OVERLAY 1
static const enum AVPixelFormat supported_main_formats[] = {
AV_PIX_FMT_NV12,
AV_PIX_FMT_YUV420P,
AV_PIX_FMT_NONE,
};
static const enum AVPixelFormat supported_overlay_formats[] = {
AV_PIX_FMT_NV12,
AV_PIX_FMT_YUV420P,
AV_PIX_FMT_YUVA420P,
AV_PIX_FMT_NONE,
};
enum var_name {
VAR_MAIN_W, VAR_MW,
VAR_MAIN_H, VAR_MH,
VAR_OVERLAY_W, VAR_OW,
VAR_OVERLAY_H, VAR_OH,
VAR_X,
VAR_Y,
VAR_N,
#if FF_API_FRAME_PKT
VAR_POS,
#endif
VAR_T,
VAR_VARS_NB
};
enum EvalMode {
EVAL_MODE_INIT,
EVAL_MODE_FRAME,
EVAL_MODE_NB
};
static const char *const var_names[] = {
"main_w", "W", ///< width of the main video
"main_h", "H", ///< height of the main video
"overlay_w", "w", ///< width of the overlay video
"overlay_h", "h", ///< height of the overlay video
"x",
"y",
"n", ///< number of frame
#if FF_API_FRAME_PKT
"pos", ///< position in the file
#endif
"t", ///< timestamp expressed in seconds
NULL
};
/**
* OverlayCUDAContext
*/
typedef struct OverlayCUDAContext {
const AVClass *class;
enum AVPixelFormat in_format_overlay;
enum AVPixelFormat in_format_main;
AVBufferRef *hw_device_ctx;
AVCUDADeviceContext *hwctx;
CUcontext cu_ctx;
CUmodule cu_module;
CUfunction cu_func;
CUstream cu_stream;
FFFrameSync fs;
int eval_mode;
int x_position;
int y_position;
double var_values[VAR_VARS_NB];
char *x_expr, *y_expr;
AVExpr *x_pexpr, *y_pexpr;
} OverlayCUDAContext;
/**
* Helper to find out if provided format is supported by filter
*/
static int format_is_supported(const enum AVPixelFormat formats[], enum AVPixelFormat fmt)
{
for (int i = 0; formats[i] != AV_PIX_FMT_NONE; i++)
if (formats[i] == fmt)
return 1;
return 0;
}
static inline int normalize_xy(double d, int chroma_sub)
{
if (isnan(d))
return INT_MAX;
return (int)d & ~((1 << chroma_sub) - 1);
}
static void eval_expr(AVFilterContext *ctx)
{
OverlayCUDAContext *s = ctx->priv;
s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, NULL);
s->var_values[VAR_Y] = av_expr_eval(s->y_pexpr, s->var_values, NULL);
/* necessary if x is expressed from y */
s->var_values[VAR_X] = av_expr_eval(s->x_pexpr, s->var_values, NULL);
s->x_position = normalize_xy(s->var_values[VAR_X], 1);
/* the cuda pixel format is using hwaccel, normalizing y is unnecessary */
s->y_position = s->var_values[VAR_Y];
}
static int set_expr(AVExpr **pexpr, const char *expr, const char *option, void *log_ctx)
{
int ret;
AVExpr *old = NULL;
if (*pexpr)
old = *pexpr;
ret = av_expr_parse(pexpr, expr, var_names,
NULL, NULL, NULL, NULL, 0, log_ctx);
if (ret < 0) {
av_log(log_ctx, AV_LOG_ERROR,
"Error when evaluating the expression '%s' for %s\n",
expr, option);
*pexpr = old;
return ret;
}
av_expr_free(old);
return 0;
}
/**
* Helper checks if we can process main and overlay pixel formats
*/
static int formats_match(const enum AVPixelFormat format_main, const enum AVPixelFormat format_overlay) {
switch(format_main) {
case AV_PIX_FMT_NV12:
return format_overlay == AV_PIX_FMT_NV12;
case AV_PIX_FMT_YUV420P:
return format_overlay == AV_PIX_FMT_YUV420P ||
format_overlay == AV_PIX_FMT_YUVA420P;
default:
return 0;
}
}
/**
* Call overlay kernell for a plane
*/
static int overlay_cuda_call_kernel(
OverlayCUDAContext *ctx,
int x_position, int y_position,
uint8_t* main_data, int main_linesize,
int main_width, int main_height,
uint8_t* overlay_data, int overlay_linesize,
int overlay_width, int overlay_height,
uint8_t* alpha_data, int alpha_linesize,
int alpha_adj_x, int alpha_adj_y) {
CudaFunctions *cu = ctx->hwctx->internal->cuda_dl;
void* kernel_args[] = {
&x_position, &y_position,
&main_data, &main_linesize,
&overlay_data, &overlay_linesize,
&overlay_width, &overlay_height,
&alpha_data, &alpha_linesize,
&alpha_adj_x, &alpha_adj_y,
};
return CHECK_CU(cu->cuLaunchKernel(
ctx->cu_func,
DIV_UP(main_width, BLOCK_X), DIV_UP(main_height, BLOCK_Y), 1,
BLOCK_X, BLOCK_Y, 1,
0, ctx->cu_stream, kernel_args, NULL));
}
/**
* Perform blend overlay picture over main picture
*/
static int overlay_cuda_blend(FFFrameSync *fs)
{
int ret;
AVFilterContext *avctx = fs->parent;
OverlayCUDAContext *ctx = avctx->priv;
AVFilterLink *outlink = avctx->outputs[0];
AVFilterLink *inlink = avctx->inputs[0];
CudaFunctions *cu = ctx->hwctx->internal->cuda_dl;
CUcontext dummy, cuda_ctx = ctx->hwctx->cuda_ctx;
AVFrame *input_main, *input_overlay;
ctx->cu_ctx = cuda_ctx;
// read main and overlay frames from inputs
ret = ff_framesync_dualinput_get(fs, &input_main, &input_overlay);
if (ret < 0)
return ret;
if (!input_main)
return AVERROR_BUG;
if (!input_overlay)
return ff_filter_frame(outlink, input_main);
ret = ff_inlink_make_frame_writable(inlink, &input_main);
if (ret < 0) {
av_frame_free(&input_main);
return ret;
}
// push cuda context
ret = CHECK_CU(cu->cuCtxPushCurrent(cuda_ctx));
if (ret < 0) {
av_frame_free(&input_main);
return ret;
}
if (ctx->eval_mode == EVAL_MODE_FRAME) {
ctx->var_values[VAR_N] = inlink->frame_count_out;
ctx->var_values[VAR_T] = input_main->pts == AV_NOPTS_VALUE ?
NAN : input_main->pts * av_q2d(inlink->time_base);
#if FF_API_FRAME_PKT
FF_DISABLE_DEPRECATION_WARNINGS
{
int64_t pos = input_main->pkt_pos;
ctx->var_values[VAR_POS] = pos == -1 ? NAN : pos;
}
FF_ENABLE_DEPRECATION_WARNINGS
#endif
ctx->var_values[VAR_OVERLAY_W] = ctx->var_values[VAR_OW] = input_overlay->width;
ctx->var_values[VAR_OVERLAY_H] = ctx->var_values[VAR_OH] = input_overlay->height;
ctx->var_values[VAR_MAIN_W ] = ctx->var_values[VAR_MW] = input_main->width;
ctx->var_values[VAR_MAIN_H ] = ctx->var_values[VAR_MH] = input_main->height;
eval_expr(avctx);
av_log(avctx, AV_LOG_DEBUG, "n:%f t:%f x:%f xi:%d y:%f yi:%d\n",
ctx->var_values[VAR_N], ctx->var_values[VAR_T],
ctx->var_values[VAR_X], ctx->x_position,
ctx->var_values[VAR_Y], ctx->y_position);
}
// overlay first plane
overlay_cuda_call_kernel(ctx,
ctx->x_position, ctx->y_position,
input_main->data[0], input_main->linesize[0],
input_main->width, input_main->height,
input_overlay->data[0], input_overlay->linesize[0],
input_overlay->width, input_overlay->height,
input_overlay->data[3], input_overlay->linesize[3], 1, 1);
// overlay rest planes depending on pixel format
switch(ctx->in_format_overlay) {
case AV_PIX_FMT_NV12:
overlay_cuda_call_kernel(ctx,
ctx->x_position, ctx->y_position / 2,
input_main->data[1], input_main->linesize[1],
input_main->width, input_main->height / 2,
input_overlay->data[1], input_overlay->linesize[1],
input_overlay->width, input_overlay->height / 2,
0, 0, 0, 0);
break;
case AV_PIX_FMT_YUV420P:
case AV_PIX_FMT_YUVA420P:
overlay_cuda_call_kernel(ctx,
ctx->x_position / 2 , ctx->y_position / 2,
input_main->data[1], input_main->linesize[1],
input_main->width / 2, input_main->height / 2,
input_overlay->data[1], input_overlay->linesize[1],
input_overlay->width / 2, input_overlay->height / 2,
input_overlay->data[3], input_overlay->linesize[3], 2, 2);
overlay_cuda_call_kernel(ctx,
ctx->x_position / 2 , ctx->y_position / 2,
input_main->data[2], input_main->linesize[2],
input_main->width / 2, input_main->height / 2,
input_overlay->data[2], input_overlay->linesize[2],
input_overlay->width / 2, input_overlay->height / 2,
input_overlay->data[3], input_overlay->linesize[3], 2, 2);
break;
default:
av_log(ctx, AV_LOG_ERROR, "Passed unsupported overlay pixel format\n");
av_frame_free(&input_main);
CHECK_CU(cu->cuCtxPopCurrent(&dummy));
return AVERROR_BUG;
}
CHECK_CU(cu->cuCtxPopCurrent(&dummy));
return ff_filter_frame(outlink, input_main);
}
static int config_input_overlay(AVFilterLink *inlink)
{
AVFilterContext *ctx = inlink->dst;
OverlayCUDAContext *s = inlink->dst->priv;
int ret;
/* Finish the configuration by evaluating the expressions
now when both inputs are configured. */
s->var_values[VAR_MAIN_W ] = s->var_values[VAR_MW] = ctx->inputs[MAIN ]->w;
s->var_values[VAR_MAIN_H ] = s->var_values[VAR_MH] = ctx->inputs[MAIN ]->h;
s->var_values[VAR_OVERLAY_W] = s->var_values[VAR_OW] = ctx->inputs[OVERLAY]->w;
s->var_values[VAR_OVERLAY_H] = s->var_values[VAR_OH] = ctx->inputs[OVERLAY]->h;
s->var_values[VAR_X] = NAN;
s->var_values[VAR_Y] = NAN;
s->var_values[VAR_N] = 0;
s->var_values[VAR_T] = NAN;
#if FF_API_FRAME_PKT
s->var_values[VAR_POS] = NAN;
#endif
if ((ret = set_expr(&s->x_pexpr, s->x_expr, "x", ctx)) < 0 ||
(ret = set_expr(&s->y_pexpr, s->y_expr, "y", ctx)) < 0)
return ret;
if (s->eval_mode == EVAL_MODE_INIT) {
eval_expr(ctx);
av_log(ctx, AV_LOG_VERBOSE, "x:%f xi:%d y:%f yi:%d\n",
s->var_values[VAR_X], s->x_position,
s->var_values[VAR_Y], s->y_position);
}
return 0;
}
/**
* Initialize overlay_cuda
*/
static av_cold int overlay_cuda_init(AVFilterContext *avctx)
{
OverlayCUDAContext* ctx = avctx->priv;
ctx->fs.on_event = &overlay_cuda_blend;
return 0;
}
/**
* Uninitialize overlay_cuda
*/
static av_cold void overlay_cuda_uninit(AVFilterContext *avctx)
{
OverlayCUDAContext* ctx = avctx->priv;
ff_framesync_uninit(&ctx->fs);
if (ctx->hwctx && ctx->cu_module) {
CUcontext dummy;
CudaFunctions *cu = ctx->hwctx->internal->cuda_dl;
CHECK_CU(cu->cuCtxPushCurrent(ctx->cu_ctx));
CHECK_CU(cu->cuModuleUnload(ctx->cu_module));
CHECK_CU(cu->cuCtxPopCurrent(&dummy));
}
av_expr_free(ctx->x_pexpr); ctx->x_pexpr = NULL;
av_expr_free(ctx->y_pexpr); ctx->y_pexpr = NULL;
av_buffer_unref(&ctx->hw_device_ctx);
ctx->hwctx = NULL;
}
/**
* Activate overlay_cuda
*/
static int overlay_cuda_activate(AVFilterContext *avctx)
{
OverlayCUDAContext *ctx = avctx->priv;
return ff_framesync_activate(&ctx->fs);
}
/**
* Configure output
*/
static int overlay_cuda_config_output(AVFilterLink *outlink)
{
extern const unsigned char ff_vf_overlay_cuda_ptx_data[];
extern const unsigned int ff_vf_overlay_cuda_ptx_len;
int err;
AVFilterContext* avctx = outlink->src;
OverlayCUDAContext* ctx = avctx->priv;
AVFilterLink *inlink = avctx->inputs[0];
AVHWFramesContext *frames_ctx = (AVHWFramesContext*)inlink->hw_frames_ctx->data;
AVFilterLink *inlink_overlay = avctx->inputs[1];
AVHWFramesContext *frames_ctx_overlay = (AVHWFramesContext*)inlink_overlay->hw_frames_ctx->data;
CUcontext dummy, cuda_ctx;
CudaFunctions *cu;
// check main input formats
if (!frames_ctx) {
av_log(ctx, AV_LOG_ERROR, "No hw context provided on main input\n");
return AVERROR(EINVAL);
}
ctx->in_format_main = frames_ctx->sw_format;
if (!format_is_supported(supported_main_formats, ctx->in_format_main)) {
av_log(ctx, AV_LOG_ERROR, "Unsupported main input format: %s\n",
av_get_pix_fmt_name(ctx->in_format_main));
return AVERROR(ENOSYS);
}
// check overlay input formats
if (!frames_ctx_overlay) {
av_log(ctx, AV_LOG_ERROR, "No hw context provided on overlay input\n");
return AVERROR(EINVAL);
}
ctx->in_format_overlay = frames_ctx_overlay->sw_format;
if (!format_is_supported(supported_overlay_formats, ctx->in_format_overlay)) {
av_log(ctx, AV_LOG_ERROR, "Unsupported overlay input format: %s\n",
av_get_pix_fmt_name(ctx->in_format_overlay));
return AVERROR(ENOSYS);
}
// check we can overlay pictures with those pixel formats
if (!formats_match(ctx->in_format_main, ctx->in_format_overlay)) {
av_log(ctx, AV_LOG_ERROR, "Can't overlay %s on %s \n",
av_get_pix_fmt_name(ctx->in_format_overlay), av_get_pix_fmt_name(ctx->in_format_main));
return AVERROR(EINVAL);
}
// initialize
ctx->hw_device_ctx = av_buffer_ref(frames_ctx->device_ref);
if (!ctx->hw_device_ctx)
return AVERROR(ENOMEM);
ctx->hwctx = ((AVHWDeviceContext*)ctx->hw_device_ctx->data)->hwctx;
cuda_ctx = ctx->hwctx->cuda_ctx;
ctx->fs.time_base = inlink->time_base;
ctx->cu_stream = ctx->hwctx->stream;
outlink->hw_frames_ctx = av_buffer_ref(inlink->hw_frames_ctx);
if (!outlink->hw_frames_ctx)
return AVERROR(ENOMEM);
// load functions
cu = ctx->hwctx->internal->cuda_dl;
err = CHECK_CU(cu->cuCtxPushCurrent(cuda_ctx));
if (err < 0) {
return err;
}
err = ff_cuda_load_module(ctx, ctx->hwctx, &ctx->cu_module, ff_vf_overlay_cuda_ptx_data, ff_vf_overlay_cuda_ptx_len);
if (err < 0) {
CHECK_CU(cu->cuCtxPopCurrent(&dummy));
return err;
}
err = CHECK_CU(cu->cuModuleGetFunction(&ctx->cu_func, ctx->cu_module, "Overlay_Cuda"));
if (err < 0) {
CHECK_CU(cu->cuCtxPopCurrent(&dummy));
return err;
}
CHECK_CU(cu->cuCtxPopCurrent(&dummy));
// init dual input
err = ff_framesync_init_dualinput(&ctx->fs, avctx);
if (err < 0) {
return err;
}
return ff_framesync_configure(&ctx->fs);
}
#define OFFSET(x) offsetof(OverlayCUDAContext, x)
#define FLAGS (AV_OPT_FLAG_FILTERING_PARAM | AV_OPT_FLAG_VIDEO_PARAM)
static const AVOption overlay_cuda_options[] = {
{ "x", "set the x expression of overlay", OFFSET(x_expr), AV_OPT_TYPE_STRING, { .str = "0" }, 0, 0, FLAGS },
{ "y", "set the y expression of overlay", OFFSET(y_expr), AV_OPT_TYPE_STRING, { .str = "0" }, 0, 0, FLAGS },
{ "eof_action", "Action to take when encountering EOF from secondary input ",
OFFSET(fs.opt_eof_action), AV_OPT_TYPE_INT, { .i64 = EOF_ACTION_REPEAT },
EOF_ACTION_REPEAT, EOF_ACTION_PASS, .flags = FLAGS, .unit = "eof_action" },
{ "repeat", "Repeat the previous frame.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_REPEAT }, .flags = FLAGS, .unit = "eof_action" },
{ "endall", "End both streams.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_ENDALL }, .flags = FLAGS, .unit = "eof_action" },
{ "pass", "Pass through the main input.", 0, AV_OPT_TYPE_CONST, { .i64 = EOF_ACTION_PASS }, .flags = FLAGS, .unit = "eof_action" },
{ "eval", "specify when to evaluate expressions", OFFSET(eval_mode), AV_OPT_TYPE_INT, { .i64 = EVAL_MODE_FRAME }, 0, EVAL_MODE_NB - 1, FLAGS, .unit = "eval" },
{ "init", "eval expressions once during initialization", 0, AV_OPT_TYPE_CONST, { .i64=EVAL_MODE_INIT }, .flags = FLAGS, .unit = "eval" },
{ "frame", "eval expressions per-frame", 0, AV_OPT_TYPE_CONST, { .i64=EVAL_MODE_FRAME }, .flags = FLAGS, .unit = "eval" },
{ "shortest", "force termination when the shortest input terminates", OFFSET(fs.opt_shortest), AV_OPT_TYPE_BOOL, { .i64 = 0 }, 0, 1, FLAGS },
{ "repeatlast", "repeat overlay of the last overlay frame", OFFSET(fs.opt_repeatlast), AV_OPT_TYPE_BOOL, {.i64=1}, 0, 1, FLAGS },
{ NULL },
};
FRAMESYNC_DEFINE_CLASS(overlay_cuda, OverlayCUDAContext, fs);
static const AVFilterPad overlay_cuda_inputs[] = {
{
.name = "main",
.type = AVMEDIA_TYPE_VIDEO,
},
{
.name = "overlay",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = config_input_overlay,
},
};
static const AVFilterPad overlay_cuda_outputs[] = {
{
.name = "default",
.type = AVMEDIA_TYPE_VIDEO,
.config_props = &overlay_cuda_config_output,
},
};
const AVFilter ff_vf_overlay_cuda = {
.name = "overlay_cuda",
.description = NULL_IF_CONFIG_SMALL("Overlay one video on top of another using CUDA"),
.priv_size = sizeof(OverlayCUDAContext),
.priv_class = &overlay_cuda_class,
.init = &overlay_cuda_init,
.uninit = &overlay_cuda_uninit,
.activate = &overlay_cuda_activate,
FILTER_INPUTS(overlay_cuda_inputs),
FILTER_OUTPUTS(overlay_cuda_outputs),
FILTER_SINGLE_PIXFMT(AV_PIX_FMT_CUDA),
.preinit = overlay_cuda_framesync_preinit,
.flags_internal = FF_FILTER_FLAG_HWFRAME_AWARE,
};
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