[FFmpeg-devel] [PATCH V2] doc/examples: Add a qsv encoder example

Steven Liu lingjiujianke at gmail.com
Wed Aug 2 09:01:11 EEST 2017


2017-08-03 1:27 GMT+08:00 Zhong Li <zhong.li at intel.com>:
> It is an evolution from the exmaple "encode_video.c" to support qsv encoder.
>
> V1->V2: Split to a separated qsv encoding example, instead of a patch
> based on encode_video.c
>
> Signed-off-by: Zhong Li <zhong.li at intel.com>
> ---
>  configure             |   2 +
>  doc/Makefile          |   1 +
>  doc/examples/qsvenc.c | 211 ++++++++++++++++++++++++++++++++++++++++++++++++++
>  3 files changed, 214 insertions(+)
>  create mode 100644 doc/examples/qsvenc.c
>
> diff --git a/configure b/configure
> index 66c7b94..676cd85 100755
> --- a/configure
> +++ b/configure
> @@ -1472,6 +1472,7 @@ EXAMPLE_LIST="
>      metadata_example
>      muxing_example
>      qsvdec_example
> +    qsvenc_example
>      remuxing_example
>      resampling_audio_example
>      scaling_video_example
> @@ -3213,6 +3214,7 @@ hw_decode_example_deps="avcodec avformat avutil"
>  metadata_example_deps="avformat avutil"
>  muxing_example_deps="avcodec avformat avutil swscale"
>  qsvdec_example_deps="avcodec avutil libmfx h264_qsv_decoder"
> +qsvenc_example_deps="avcodec avutil libmfx"
>  remuxing_example_deps="avcodec avformat avutil"
>  resampling_audio_example_deps="avutil swresample"
>  scaling_video_example_deps="avutil swscale"
> diff --git a/doc/Makefile b/doc/Makefile
> index b670f0b..ed41763 100644
> --- a/doc/Makefile
> +++ b/doc/Makefile
> @@ -52,6 +52,7 @@ DOC_EXAMPLES-$(CONFIG_HW_DECODE_EXAMPLE)         += hw_decode
>  DOC_EXAMPLES-$(CONFIG_METADATA_EXAMPLE)          += metadata
>  DOC_EXAMPLES-$(CONFIG_MUXING_EXAMPLE)            += muxing
>  DOC_EXAMPLES-$(CONFIG_QSVDEC_EXAMPLE)            += qsvdec
> +DOC_EXAMPLES-$(CONFIG_QSVENC_EXAMPLE)            += qsvenc
>  DOC_EXAMPLES-$(CONFIG_REMUXING_EXAMPLE)          += remuxing
>  DOC_EXAMPLES-$(CONFIG_RESAMPLING_AUDIO_EXAMPLE)  += resampling_audio
>  DOC_EXAMPLES-$(CONFIG_SCALING_VIDEO_EXAMPLE)     += scaling_video
> diff --git a/doc/examples/qsvenc.c b/doc/examples/qsvenc.c
> new file mode 100644
> index 0000000..3b94cc8
> --- /dev/null
> +++ b/doc/examples/qsvenc.c
> @@ -0,0 +1,211 @@
> +/*
> + * Copyright (c) 2017 Fabrice Bellard, Zhong Li
> + *
> + * Permission is hereby granted, free of charge, to any person obtaining a copy
> + * of this software and associated documentation files (the "Software"), to deal
> + * in the Software without restriction, including without limitation the rights
> + * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
> + * copies of the Software, and to permit persons to whom the Software is
> + * furnished to do so, subject to the following conditions:
> + *
> + * The above copyright notice and this permission notice shall be included in
> + * all copies or substantial portions of the Software.
> + *
> + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
> + * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
> + * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
> + * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
> + * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
> + * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
> + * THE SOFTWARE.
> + */
> +
> +/**
> + * @file
> + * Intel QSV-accelerated encoding example
> + *
> + * @example qsvenc.c
> + */
> +
> +#include <stdio.h>
> +#include <stdlib.h>
> +#include <string.h>
> +
> +#include <libavcodec/avcodec.h>
> +
> +#include <libavutil/opt.h>
> +#include <libavutil/imgutils.h>
> +#include "libavutil/buffer.h"
> +#include "libavutil/hwcontext.h"
> +
> +static void encode(AVCodecContext *enc_ctx, AVFrame *frame, AVPacket *pkt,
> +                   FILE *outfile)
> +{
> +    int ret;
> +
> +    /* send the frame to the encoder */
> +    if (frame)
> +        printf("Send frame %3"PRId64"\n", frame->pts);
> +
> +    ret = avcodec_send_frame(enc_ctx, frame);
> +    if (ret < 0) {
> +        fprintf(stderr, "Error sending a frame for encoding\n");
> +        exit(1);
> +    }
> +
> +    while (ret >= 0) {
> +        ret = avcodec_receive_packet(enc_ctx, pkt);
> +        if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
> +            return;
> +        else if (ret < 0) {
> +            fprintf(stderr, "Error during encoding\n");
> +            exit(1);
> +        }
> +
> +        printf("Write packet %3"PRId64" (size=%5d)\n", pkt->pts, pkt->size);
> +        fwrite(pkt->data, 1, pkt->size, outfile);
> +        av_packet_unref(pkt);
> +    }
> +}
> +
> +int main(int argc, char **argv)
> +{
> +    const char *filename, *codec_name;
> +    const AVCodec *codec;
> +    AVCodecContext *c= NULL;
Why don't use AVCodecParameters?
> +    int i, ret, x, y;
> +    FILE *f;
> +    AVFrame *frame;
> +    AVPacket *pkt;
> +    AVBufferRef *encode_device = NULL;
> +
> +    if (argc <= 2) {
> +        fprintf(stderr, "Usage: %s <output file> <codec name>\n", argv[0]);
> +        exit(0);
> +    }
> +    filename = argv[1];
> +    codec_name = argv[2];
> +
> +    if (!strstr(codec_name, "qsv")) {
> +        fprintf(stderr, "no qsv codec found\n");
> +        exit(0);
> +    }
> +
> +    avcodec_register_all();
> +
> +    /* open the qsv hardware device */
> +    ret = av_hwdevice_ctx_create(&encode_device, AV_HWDEVICE_TYPE_QSV,
> +                                 NULL, NULL, 0);
> +    if (ret < 0) {
> +        fprintf(stderr, "Cannot open the hardware device\n");
> +        exit(1);
> +    }
> +
> +    /* find the encoder */
> +    codec = avcodec_find_encoder_by_name(codec_name);
> +    if (!codec) {
> +        fprintf(stderr, "Codec '%s' not found\n", codec_name);
> +        exit(1);
> +    }
> +
> +    c = avcodec_alloc_context3(codec);
> +    if (!c) {
> +        fprintf(stderr, "Could not allocate video codec context\n");
> +        exit(1);
> +    }
> +
> +    pkt = av_packet_alloc();
> +    if (!pkt)
> +        exit(1);
> +
> +    /* put sample parameters */
> +    c->bit_rate = 400000;
> +    /* resolution must be a multiple of two */
> +    c->width = 352;
> +    c->height = 288;
> +    /* frames per second */
> +    c->time_base = (AVRational){1, 25};
> +    c->framerate = (AVRational){25, 1};
> +
> +    /* emit one intra frame every ten frames
> +     * check frame pict_type before passing frame
> +     * to encoder, if frame->pict_type is AV_PICTURE_TYPE_I
> +     * then gop_size is ignored and the output of encoder
> +     * will always be I frame irrespective to gop_size
> +     */
> +    c->gop_size = 10;
> +    c->max_b_frames = 1;
> +    c->pix_fmt = AV_PIX_FMT_NV12;
> +    c->hw_device_ctx = av_buffer_ref(encode_device);
> +
> +    /* open it */
> +    ret = avcodec_open2(c, codec, NULL);
> +    if (ret < 0) {
> +        fprintf(stderr, "Could not open codec: %s\n", av_err2str(ret));
> +        exit(1);
> +    }
> +
> +    f = fopen(filename, "wb");
> +    if (!f) {
> +        fprintf(stderr, "Could not open %s\n", filename);
> +        exit(1);
> +    }
> +
> +    frame = av_frame_alloc();
> +    if (!frame) {
> +        fprintf(stderr, "Could not allocate video frame\n");
> +        exit(1);
> +    }
> +    frame->format = c->pix_fmt;
> +    frame->width  = c->width;
> +    frame->height = c->height;
> +
> +    ret = av_frame_get_buffer(frame, 32);
> +    if (ret < 0) {
> +        fprintf(stderr, "Could not allocate the video frame data\n");
> +        exit(1);
> +    }
> +
> +    /* encode 1 second of video */
> +    for (i = 0; i < 25; i++) {
> +        fflush(stdout);
> +
> +        /* make sure the frame data is writable */
> +        ret = av_frame_make_writable(frame);
> +        if (ret < 0)
> +            exit(1);
> +
> +        /* prepare a dummy image */
> +        /* Y */
> +        for (y = 0; y < c->height; y++) {
> +            for (x = 0; x < c->width; x++) {
> +                frame->data[0][y * frame->linesize[0] + x] = x + y + i * 3;
> +            }
> +        }
> +
> +        /* Cb and Cr */
> +        for (y = 0; y < c->height/2; y++) {
> +            for (x = 0; x < c->width/2; x++) {
> +                frame->data[1][y * frame->linesize[1] + 2 * x] = 128 + y + i * 2;
> +                frame->data[1][y * frame->linesize[1] + 2 * x + 1] = 64 + x + i * 5;
> +            }
> +        }
> +
> +        frame->pts = i;
> +
> +        /* encode the image */
> +        encode(c, frame, pkt, f);
> +    }
> +
> +    /* flush the encoder */
> +    encode(c, NULL, pkt, f);
> +
> +    fclose(f);
> +
> +    avcodec_free_context(&c);
> +    av_frame_free(&frame);
> +    av_packet_free(&pkt);
> +    av_buffer_unref(&encode_device);
> +
> +    return 0;
> +}
> --
> 1.8.3.1
>
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