ffmpeg и Intel Quick Sync Video

Я пытаюсь использовать Intel Quick Sync Video, но у меня есть нарушение прав доступа, когда выполняем av_hwdevice_ctx_create () с типом == AV_HWDEVICE_TYPE_QSV. Это работает, если я использую AV_HWDEVICE_TYPE_D3D11VA, например, без каких-либо проблем. Я не знаю что делать. Кто-нибудь может мне помочь? Я использую пример из ffmpeg, но немного его модифицировал:

#include <stdio.h>
extern "C" {
#include <libavcodec/avcodec.h>
#include <libavformat/avformat.h>
#include <libavutil/pixdesc.h>
#include <libavutil/hwcontext.h>
#include <libavutil/opt.h>
#include <libavutil/avassert.h>
#include <libavutil/imgutils.h>
}

static AVBufferRef *hw_device_ctx = NULL;
static enum AVPixelFormat hw_pix_fmt;
static FILE *output_file = NULL;

static enum AVPixelFormat find_fmt_by_hw_type(const enum AVHWDeviceType type)
{
enum AVPixelFormat fmt;

switch (type) {
case AV_HWDEVICE_TYPE_VAAPI:
fmt = AV_PIX_FMT_VAAPI;
break;
case AV_HWDEVICE_TYPE_DXVA2:
fmt = AV_PIX_FMT_DXVA2_VLD;
break;
case AV_HWDEVICE_TYPE_D3D11VA:
fmt = AV_PIX_FMT_D3D11;
break;
case AV_HWDEVICE_TYPE_VDPAU:
fmt = AV_PIX_FMT_VDPAU;
break;
case AV_HWDEVICE_TYPE_VIDEOTOOLBOX:
fmt = AV_PIX_FMT_VIDEOTOOLBOX;
break;
case AV_HWDEVICE_TYPE_QSV://thise i added by myself
fmt = AV_PIX_FMT_QSV;
break;
default:
fmt = AV_PIX_FMT_NONE;
break;
}

return fmt;
}

static int hw_decoder_init(AVCodecContext *ctx, const enum AVHWDeviceType type)
{
int err = 0;

if ((err = av_hwdevice_ctx_create(&hw_device_ctx, type,
NULL, NULL, 0)) < 0) {
fprintf(stderr, "Failed to create specified HW device.\n");
return err;
}
ctx->hw_device_ctx = av_buffer_ref(hw_device_ctx);

return err;
}

static enum AVPixelFormat get_hw_format(AVCodecContext *ctx,
const enum AVPixelFormat *pix_fmts)
{
const enum AVPixelFormat *p;

for (p = pix_fmts; *p != -1; p++) {
if (*p == hw_pix_fmt)
return *p;
}

fprintf(stderr, "Failed to get HW surface format.\n");
return AV_PIX_FMT_NONE;
}

static int decode_write(AVCodecContext *avctx, AVPacket *packet)
{
AVFrame *frame = NULL, *sw_frame = NULL;
AVFrame *tmp_frame = NULL;
uint8_t *buffer = NULL;
int size;
int ret = 0;

ret = avcodec_send_packet(avctx, packet);
if (ret < 0) {
fprintf(stderr, "Error during decoding\n");
return ret;
}

while (ret >= 0) {
if (!(frame = av_frame_alloc()) || !(sw_frame = av_frame_alloc())) {
fprintf(stderr, "Can not alloc frame\n");
ret = AVERROR(ENOMEM);
goto fail;
}

ret = avcodec_receive_frame(avctx, frame);
if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
av_frame_free(&frame);
av_frame_free(&sw_frame);
return 0;
}
else if (ret < 0) {
fprintf(stderr, "Error while decoding\n");
goto fail;
}

if (frame->format == hw_pix_fmt) {
/* retrieve data from GPU to CPU */
if ((ret = av_hwframe_transfer_data(sw_frame, frame, 0)) < 0) {
fprintf(stderr, "Error transferring the data to system memory\n");
goto fail;
}
tmp_frame = sw_frame;
}
else
tmp_frame = frame;

size = av_image_get_buffer_size((AVPixelFormat)tmp_frame->format, tmp_frame->width,
tmp_frame->height, 1);
buffer = (uint8_t*)av_malloc(size);
if (!buffer) {
fprintf(stderr, "Can not alloc buffer\n");
ret = AVERROR(ENOMEM);
goto fail;
}
ret = av_image_copy_to_buffer(buffer, size,
(const uint8_t * const *)tmp_frame->data,
(const int *)tmp_frame->linesize, (AVPixelFormat)tmp_frame->format,
tmp_frame->width, tmp_frame->height, 1);
if (ret < 0) {
fprintf(stderr, "Can not copy image to buffer\n");
goto fail;
}

if ((ret = fwrite(buffer, 1, size, output_file)) < 0) {
fprintf(stderr, "Failed to dump raw data.\n");
goto fail;
}

fail:
av_frame_free(&frame);
av_frame_free(&sw_frame);
if (buffer)
av_freep(&buffer);
if (ret < 0)
return ret;
}

return 0;
}

int main(int argc, char *argv[])
{
AVFormatContext *input_ctx = NULL;
int video_stream, ret;
AVStream *video = NULL;
AVCodecContext *decoder_ctx = NULL;
AVCodec *decoder = NULL;
AVPacket packet;
enum AVHWDeviceType type;

if (argc < 4) {
fprintf(stderr, "Usage: %s <vaapi|vdpau|dxva2|d3d11va> <input file> <output file>\n", argv[0]);
return -1;
}

av_register_all();

type = av_hwdevice_find_type_by_name(argv[1]);
hw_pix_fmt = find_fmt_by_hw_type(type);
if (hw_pix_fmt == -1) {
fprintf(stderr, "Cannot support '%s' in this example.\n", argv[1]);
return -1;
}

/* open the input file */
if (avformat_open_input(&input_ctx, argv[2], NULL, NULL) != 0) {
fprintf(stderr, "Cannot open input file '%s'\n", argv[2]);
return -1;
}

if (avformat_find_stream_info(input_ctx, NULL) < 0) {
fprintf(stderr, "Cannot find input stream information.\n");
return -1;
}

/* find the video stream information */
ret = av_find_best_stream(input_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, &decoder, 0);
if (ret < 0) {
fprintf(stderr, "Cannot find a video stream in the input file\n");
return -1;
}
video_stream = ret;

if (!(decoder_ctx = avcodec_alloc_context3(decoder)))
return AVERROR(ENOMEM);

video = input_ctx->streams[video_stream];
if (avcodec_parameters_to_context(decoder_ctx, video->codecpar) < 0)
return -1;

decoder_ctx->get_format = get_hw_format;
av_opt_set_int(decoder_ctx, "refcounted_frames", 1, 0);

if (hw_decoder_init(decoder_ctx, type) < 0)
return -1;

if ((ret = avcodec_open2(decoder_ctx, decoder, NULL)) < 0) {
fprintf(stderr, "Failed to open codec for stream #%u\n", video_stream);
return -1;
}

/* open the file to dump raw data */
output_file = fopen(argv[3], "w+");

/* actual decoding and dump the raw data */
while (ret >= 0) {
if ((ret = av_read_frame(input_ctx, &packet)) < 0)
break;

if (video_stream == packet.stream_index)
ret = decode_write(decoder_ctx, &packet);

av_packet_unref(&packet);
}

/* flush the decoder */
packet.data = NULL;
packet.size = 0;
ret = decode_write(decoder_ctx, &packet);
av_packet_unref(&packet);

if (output_file)
fclose(output_file);
avcodec_free_context(&decoder_ctx);
avformat_close_input(&input_ctx);
av_buffer_unref(&hw_device_ctx);

return 0;
}