On Mon, 2022-10-31 at 15:22 +0800, wenbin.chen-at-intel....@ffmpeg.org wrote:
> From: Wenbin Chen <wenbin.c...@intel.com>
>
> Add qsv_transcode example which shows how to use qsv to do hardware
> accelerated transcoding, also show how to dynamically set encoding
> parameters.
>
> examples:
> Normal usage:
> qsv_transcode input.mp4 h264_qsv output.mp4 "g 60"
>
> Dynamic setting usage:
> qsv_transcode input.mp4 hevc_qsv output.mp4 "g 60 asyne_depth 1"
> 100 "g 120"
> This command initializes codec with gop_size 60 and change it to
> 120 after 100 frames
>
> Signed-off-by: Wenbin Chen <wenbin.c...@intel.com>
> ---
> configure | 2 +
> doc/examples/.gitignore | 1 +
> doc/examples/Makefile | 1 +
> doc/examples/qsv_transcode.c | 440 +++++++++++++++++++++++++++++++++++
> 4 files changed, 444 insertions(+)
> create mode 100644 doc/examples/qsv_transcode.c
>
> diff --git a/configure b/configure
> index 70c9e41dcc..a8b4496465 100755
> --- a/configure
> +++ b/configure
> @@ -1748,6 +1748,7 @@ EXAMPLE_LIST="
> transcoding_example
> vaapi_encode_example
> vaapi_transcode_example
> + qsv_transcode_example
> "
>
> EXTERNAL_AUTODETECT_LIBRARY_LIST="
> @@ -3811,6 +3812,7 @@ transcode_aac_example_deps="avcodec avformat swresample"
> transcoding_example_deps="avfilter avcodec avformat avutil"
> vaapi_encode_example_deps="avcodec avutil h264_vaapi_encoder"
> vaapi_transcode_example_deps="avcodec avformat avutil h264_vaapi_encoder"
> +qsv_transcode_example_deps="avcodec avformat avutil h264_qsv_encoder"
>
> # EXTRALIBS_LIST
> cpu_init_extralibs="pthreads_extralibs"
> diff --git a/doc/examples/.gitignore b/doc/examples/.gitignore
> index 44960e1de7..d787afdd4c 100644
> --- a/doc/examples/.gitignore
> +++ b/doc/examples/.gitignore
> @@ -22,3 +22,4 @@
> /transcoding
> /vaapi_encode
> /vaapi_transcode
> +/qsv_transcode
> diff --git a/doc/examples/Makefile b/doc/examples/Makefile
> index 81bfd34d5d..f937fbefda 100644
> --- a/doc/examples/Makefile
> +++ b/doc/examples/Makefile
> @@ -21,6 +21,7 @@ EXAMPLES-$(CONFIG_TRANSCODE_AAC_EXAMPLE) +=
> transcode_aac
> EXAMPLES-$(CONFIG_TRANSCODING_EXAMPLE) += transcoding
> EXAMPLES-$(CONFIG_VAAPI_ENCODE_EXAMPLE) += vaapi_encode
> EXAMPLES-$(CONFIG_VAAPI_TRANSCODE_EXAMPLE) += vaapi_transcode
> +EXAMPLES-$(CONFIG_QSV_TRANSCODE_EXAMPLE) += qsv_transcode
>
> EXAMPLES := $(EXAMPLES-yes:%=doc/examples/%$(PROGSSUF)$(EXESUF))
> EXAMPLES_G := $(EXAMPLES-yes:%=doc/examples/%$(PROGSSUF)_g$(EXESUF))
> diff --git a/doc/examples/qsv_transcode.c b/doc/examples/qsv_transcode.c
> new file mode 100644
> index 0000000000..9b37bbea9f
> --- /dev/null
> +++ b/doc/examples/qsv_transcode.c
> @@ -0,0 +1,440 @@
> +/*
> + * Quick Sync Video (video transcoding) transcode sample
> + *
> + * 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 transcoding example.
> + *
> + * @example qsv_transcode.c
> + * This example shows how to do QSV-accelerated transcoding and how to
> + * dynamically change encoder's option.
> + * Usage: qsv_transcode input_stream codec output_stream initial option
> + * { frame_number new_option }
> + * e.g: - qsv_transcode input.mp4 h264_qsv output_h264.mp4 "g 60"
> + * - qsv_transcode input.mp4 hevc_qsv output_hevc.mp4 "g 60 async_depth
> 1"
> + * 100 "g 120"
> + * (initialize codec with gop_size 60 and change it to 120 after 100
> + * frames)
> + */
> +
> +#include <stdio.h>
> +#include <errno.h>
> +
> +#include <libavutil/hwcontext.h>
> +#include <libavcodec/avcodec.h>
> +#include <libavformat/avformat.h>
> +#include <libavutil/opt.h>
> +
> +static AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL;
> +static AVBufferRef *hw_device_ctx = NULL;
> +static AVCodecContext *decoder_ctx = NULL, *encoder_ctx = NULL;
> +static int video_stream = -1;
> +
> +typedef struct DynamicSetting {
> + int frame_number;
> + char* optstr;
> +} DynamicSetting;
> +static DynamicSetting *dynamic_setting;
> +static int setting_number;
> +static int current_setting_number;
> +
> +static int str_to_dict(char* optstr, AVDictionary **opt)
> +{
> + char *key, *value;
> + if (strlen(optstr) == 0)
> + return 0;
> + key = strtok(optstr, " ");
> + if (key == NULL)
> + return AVERROR(ENAVAIL);
> + value = strtok(NULL, " ");
> + if (value == NULL)
> + return AVERROR(ENAVAIL);
> + av_dict_set(opt, key, value, 0);
> + do {
> + key = strtok(NULL, " ");
> + if (key == NULL)
> + return 0;
> + value = strtok(NULL, " ");
> + if (value == NULL)
> + return AVERROR(ENAVAIL);
> + av_dict_set(opt, key, value, 0);
> + } while(key != NULL);
> + return 0;
> +}
> +
> +static int dynamic_set_parameter(AVCodecContext *avctx)
> +{
> + AVDictionary *opts = NULL;
> + int ret = 0;
> + static int frame_number = 0;
> + frame_number++;
> + if (current_setting_number < setting_number &&
> + frame_number == dynamic_setting[current_setting_number].frame_number)
> {
> + AVDictionaryEntry *e = NULL;
> + ret = str_to_dict(dynamic_setting[current_setting_number].optstr,
> &opts);
> + if (ret < 0) {
> + fprintf(stderr, "The dynamic parameter is wrong\n");
> + goto fail;
> + }
> + /* Set common option. The dictionary will be freed and replaced
> + * by a new one containing all options not found in common option
> list.
> + * Then this new dictionary is used to set private option. */
> + if ((ret = av_opt_set_dict(avctx, &opts)) < 0)
> + goto fail;
> + /* Set codec specific option */
> + if ((ret = av_opt_set_dict(avctx->priv_data, &opts)) < 0)
> + goto fail;
> + /* There is no "framerate" option in commom option list. Use "-r" to
> set
> + * framerate, which is compatible with ffmpeg commandline. The video
> is
> + * assumed to be average frame rate, so set time_base to 1/framerate.
> */
> + e = av_dict_get(opts, "r", NULL, 0);
> + if (e) {
> + avctx->framerate = av_d2q(atof(e->value), INT_MAX);
> + encoder_ctx->time_base = av_inv_q(encoder_ctx->framerate);
> + }
> + }
> +fail:
> + av_dict_free(&opts);
> + return ret;
> +}
> +
> +static int get_format(AVCodecContext *avctx, const enum AVPixelFormat
> *pix_fmts)
> +{
> + while (*pix_fmts != AV_PIX_FMT_NONE) {
> + if (*pix_fmts == AV_PIX_FMT_QSV) {
> + return AV_PIX_FMT_QSV;
> + }
> +
> + pix_fmts++;
> + }
> +
> + fprintf(stderr, "The QSV pixel format not offered in get_format()\n");
> +
> + return AV_PIX_FMT_NONE;
> +}
> +
> +static int open_input_file(char *filename)
> +{
> + int ret;
> + const AVCodec *decoder = NULL;
> + AVStream *video = NULL;
> +
> + if ((ret = avformat_open_input(&ifmt_ctx, filename, NULL, NULL)) < 0) {
> + fprintf(stderr, "Cannot open input file '%s', Error code: %s\n",
> + filename, av_err2str(ret));
> + return ret;
> + }
> +
> + if ((ret = avformat_find_stream_info(ifmt_ctx, NULL)) < 0) {
> + fprintf(stderr, "Cannot find input stream information. Error code:
> %s\n",
> + av_err2str(ret));
> + return ret;
> + }
> +
> + ret = av_find_best_stream(ifmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0);
> + if (ret < 0) {
> + fprintf(stderr, "Cannot find a video stream in the input file. "
> + "Error code: %s\n", av_err2str(ret));
> + return ret;
> + }
> + video_stream = ret;
> + video = ifmt_ctx->streams[video_stream];
> +
> + switch(video->codecpar->codec_id) {
> + case AV_CODEC_ID_H264:
> + decoder = avcodec_find_decoder_by_name("h264_qsv");
> + break;
> + case AV_CODEC_ID_HEVC:
> + decoder = avcodec_find_decoder_by_name("hevc_qsv");
> + break;
> + case AV_CODEC_ID_VP9:
> + decoder = avcodec_find_decoder_by_name("vp9_qsv");
> + break;
> + case AV_CODEC_ID_VP8:
> + decoder = avcodec_find_decoder_by_name("vp8_qsv");
> + break;
> + case AV_CODEC_ID_AV1:
> + decoder = avcodec_find_decoder_by_name("av1_qsv");
> + break;
> + case AV_CODEC_ID_MPEG2VIDEO:
> + decoder = avcodec_find_decoder_by_name("mpeg2_qsv");
> + break;
> + case AV_CODEC_ID_MJPEG:
> + decoder = avcodec_find_decoder_by_name("mjpeg_qsv");
> + break;
> + default:
> + fprintf(stderr, "Codec is not supportted by qsv\n");
> + return AVERROR(ENAVAIL);
> + }
> +
> + if (!(decoder_ctx = avcodec_alloc_context3(decoder)))
> + return AVERROR(ENOMEM);
> +
> + if ((ret = avcodec_parameters_to_context(decoder_ctx, video->codecpar)) <
> 0) {
> + fprintf(stderr, "avcodec_parameters_to_context error. Error code:
> %s\n",
> + av_err2str(ret));
> + return ret;
> + }
> + decoder_ctx->framerate = av_guess_frame_rate(ifmt_ctx, video, NULL);
> +
> + decoder_ctx->hw_device_ctx = av_buffer_ref(hw_device_ctx);
> + if (!decoder_ctx->hw_device_ctx) {
> + fprintf(stderr, "A hardware device reference create failed.\n");
> + return AVERROR(ENOMEM);
> + }
> + decoder_ctx->get_format = get_format;
> + decoder_ctx->pkt_timebase = video->time_base;
> + if ((ret = avcodec_open2(decoder_ctx, decoder, NULL)) < 0)
> + fprintf(stderr, "Failed to open codec for decoding. Error code:
> %s\n",
> + av_err2str(ret));
> +
> + return ret;
> +}
> +
> +static int encode_write(AVPacket *enc_pkt, AVFrame *frame)
> +{
> + int ret = 0;
> +
> + av_packet_unref(enc_pkt);
> +
> + if((ret = dynamic_set_parameter(encoder_ctx)) < 0) {
> + fprintf(stderr, "Failed to set dynamic parameter. Error code: %s\n",
> + av_err2str(ret));
> + goto end;
> + }
> +
> + if ((ret = avcodec_send_frame(encoder_ctx, frame)) < 0) {
> + fprintf(stderr, "Error during encoding. Error code: %s\n",
> av_err2str(ret));
> + goto end;
> + }
> + while (1) {
> + if (ret = avcodec_receive_packet(encoder_ctx, enc_pkt))
> + break;
> + enc_pkt->stream_index = 0;
> + av_packet_rescale_ts(enc_pkt, encoder_ctx->time_base,
> + ofmt_ctx->streams[0]->time_base);
> + if ((ret = av_interleaved_write_frame(ofmt_ctx, enc_pkt)) < 0) {
> + fprintf(stderr, "Error during writing data to output file. "
> + "Error code: %s\n", av_err2str(ret));
> + return ret;
> + }
> + }
> +
> +end:
> + if (ret == AVERROR_EOF)
> + return 0;
> + ret = ((ret == AVERROR(EAGAIN)) ? 0:-1);
> + return ret;
> +}
> +
> +static int dec_enc(AVPacket *pkt, const AVCodec *enc_codec, char *optstr)
> +{
> + AVFrame *frame;
> + int ret = 0;
> +
> + ret = avcodec_send_packet(decoder_ctx, pkt);
> + if (ret < 0) {
> + fprintf(stderr, "Error during decoding. Error code: %s\n",
> av_err2str(ret));
> + return ret;
> + }
> +
> + while (ret >= 0) {
> + if (!(frame = av_frame_alloc()))
> + return AVERROR(ENOMEM);
> +
> + ret = avcodec_receive_frame(decoder_ctx, frame);
> + if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
> + av_frame_free(&frame);
> + return 0;
> + } else if (ret < 0) {
> + fprintf(stderr, "Error while decoding. Error code: %s\n",
> av_err2str(ret));
> + goto fail;
> + }
> + if (!encoder_ctx->hw_frames_ctx) {
> + AVDictionaryEntry *e = NULL;
> + AVDictionary *opts = NULL;
> + AVStream *ost;
> + /* we need to ref hw_frames_ctx of decoder to initialize
> encoder's codec.
> + Only after we get a decoded frame, can we obtain its
> hw_frames_ctx */
> + encoder_ctx->hw_frames_ctx = av_buffer_ref(decoder_ctx-
> >hw_frames_ctx);
> + if (!encoder_ctx->hw_frames_ctx) {
> + ret = AVERROR(ENOMEM);
> + goto fail;
> + }
> + /* set AVCodecContext Parameters for encoder, here we keep them
> stay
> + * the same as decoder.
> + */
> + encoder_ctx->time_base = av_inv_q(decoder_ctx->framerate);
> + encoder_ctx->pix_fmt = AV_PIX_FMT_QSV;
> + encoder_ctx->width = decoder_ctx->width;
> + encoder_ctx->height = decoder_ctx->height;
> + if ((ret = str_to_dict(optstr, &opts)) < 0) {
> + fprintf(stderr, "Failed to set encoding parameter.\n");
> + goto fail;
> + }
> + /* There is no "framerate" option in commom option list. Use
> "-r"
> to
> + * set framerate, which is compatible with ffmpeg commandline. The
> + * video is assumed to be average frame rate, so set time_base to
> + * 1/framerate. */
> + e = av_dict_get(opts, "r", NULL, 0);
> + if (e) {
> + encoder_ctx->framerate = av_d2q(atof(e->value), INT_MAX);
> + encoder_ctx->time_base = av_inv_q(encoder_ctx->framerate);
> + }
> + if ((ret = avcodec_open2(encoder_ctx, enc_codec, &opts)) < 0) {
> + fprintf(stderr, "Failed to open encode codec. Error code:
> %s\n",
> + av_err2str(ret));
> + av_dict_free(&opts);
> + goto fail;
> + }
> + av_dict_free(&opts);
> +
> + if (!(ost = avformat_new_stream(ofmt_ctx, enc_codec))) {
> + fprintf(stderr, "Failed to allocate stream for output
> format.\n");
> + ret = AVERROR(ENOMEM);
> + goto fail;
> + }
> +
> + ost->time_base = encoder_ctx->time_base;
> + ret = avcodec_parameters_from_context(ost->codecpar,
> encoder_ctx);
> + if (ret < 0) {
> + fprintf(stderr, "Failed to copy the stream parameters. "
> + "Error code: %s\n", av_err2str(ret));
> + goto fail;
> + }
> +
> + /* write the stream header */
> + if ((ret = avformat_write_header(ofmt_ctx, NULL)) < 0) {
> + fprintf(stderr, "Error while writing stream header. "
> + "Error code: %s\n", av_err2str(ret));
> + goto fail;
> + }
> + }
> + frame->pts = av_rescale_q(frame->pts, decoder_ctx->pkt_timebase,
> + encoder_ctx->time_base);
> + if ((ret = encode_write(pkt, frame)) < 0)
> + fprintf(stderr, "Error during encoding and writing.\n");
> +
> +fail:
> + av_frame_free(&frame);
> + if (ret < 0)
> + return ret;
> + }
> + return 0;
> +}
> +
> +int main(int argc, char **argv)
> +{
> + const AVCodec *enc_codec;
> + int ret = 0;
> + AVPacket *dec_pkt;
> +
> + if (argc < 5 || (argc - 5) % 2) {
> + av_log(NULL, AV_LOG_ERROR, "Usage: %s <input file> <encoder> <output
> file>"
> + " <\"encoding option set 0\"> [<frame_number> <\"encoding
> options set 1\">]...\n", argv[0]);
> + return 1;
> + }
> + setting_number = (argc - 5) / 2;
> + dynamic_setting = av_malloc(setting_number * sizeof(*dynamic_setting));
> + current_setting_number = 0;
> + for (int i = 0; i < setting_number; i++) {
> + dynamic_setting[i].frame_number = atoi(argv[i*2 + 5]);
> + dynamic_setting[i].optstr = argv[i*2 + 6];
> + }
> +
> + ret = av_hwdevice_ctx_create(&hw_device_ctx, AV_HWDEVICE_TYPE_QSV, NULL,
> NULL, 0);
> + if (ret < 0) {
> + fprintf(stderr, "Failed to create a QSV device. Error code: %s\n",
> av_err2str(ret));
> + goto end;
> + }
> +
> + dec_pkt = av_packet_alloc();
> + if (!dec_pkt) {
> + fprintf(stderr, "Failed to allocate decode packet\n");
> + goto end;
> + }
> +
> + if ((ret = open_input_file(argv[1])) < 0)
> + goto end;
> +
> + if (!(enc_codec = avcodec_find_encoder_by_name(argv[2]))) {
> + fprintf(stderr, "Could not find encoder '%s'\n", argv[2]);
> + ret = -1;
> + goto end;
> + }
> +
> + if ((ret = (avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL,
> argv[3]))) < 0) {
> + fprintf(stderr, "Failed to deduce output format from file extension.
> Error code: "
> + "%s\n", av_err2str(ret));
> + goto end;
> + }
> +
> + if (!(encoder_ctx = avcodec_alloc_context3(enc_codec))) {
> + ret = AVERROR(ENOMEM);
> + goto end;
> + }
> +
> + ret = avio_open(&ofmt_ctx->pb, argv[3], AVIO_FLAG_WRITE);
> + if (ret < 0) {
> + fprintf(stderr, "Cannot open output file. "
> + "Error code: %s\n", av_err2str(ret));
> + goto end;
> + }
> +
> + /* read all packets and only transcoding video */
> + while (ret >= 0) {
> + if ((ret = av_read_frame(ifmt_ctx, dec_pkt)) < 0)
> + break;
> +
> + if (video_stream == dec_pkt->stream_index)
> + ret = dec_enc(dec_pkt, enc_codec, argv[4]);
> +
> + av_packet_unref(dec_pkt);
> + }
> +
> + /* flush decoder */
> + av_packet_unref(dec_pkt);
> + if ((ret = dec_enc(dec_pkt, enc_codec, argv[4])) < 0) {
> + fprintf(stderr, "Failed to flush decoder %s\n", av_err2str(ret));
> + goto end;
> + }
> +
> + /* flush encoder */
> + if ((ret = encode_write(dec_pkt, NULL)) < 0) {
> + fprintf(stderr, "Failed to flush encoder %s\n", av_err2str(ret));
> + goto end;
> + }
> +
> + /* write the trailer for output stream */
> + if ((ret = av_write_trailer(ofmt_ctx)) < 0)
> + fprintf(stderr, "Failed to write trailer %s\n", av_err2str(ret));
> +
> +end:
> + avformat_close_input(&ifmt_ctx);
> + avformat_close_input(&ofmt_ctx);
> + avcodec_free_context(&decoder_ctx);
> + avcodec_free_context(&encoder_ctx);
> + av_buffer_unref(&hw_device_ctx);
> + av_packet_free(&dec_pkt);
> + av_freep(&dynamic_setting);
> + return ret;
> +}
LGTM. Is there any comment for this example? I'll merge it if no comment /
objection.
Thanks
Haihao
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