439 lines
15 KiB
C
439 lines
15 KiB
C
/*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
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* THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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/**
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* @file Intel QSV-accelerated video transcoding API usage example
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* @example qsv_transcode.c
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*
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* Perform QSV-accelerated transcoding and show to dynamically change
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* encoder's options.
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*
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* Usage: qsv_transcode input_stream codec output_stream initial option
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* { frame_number new_option }
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* e.g: - qsv_transcode input.mp4 h264_qsv output_h264.mp4 "g 60"
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* - qsv_transcode input.mp4 hevc_qsv output_hevc.mp4 "g 60 async_depth 1"
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* 100 "g 120"
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* (initialize codec with gop_size 60 and change it to 120 after 100
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* frames)
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*/
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#include <stdio.h>
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#include <errno.h>
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#include <libavutil/hwcontext.h>
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#include <libavcodec/avcodec.h>
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#include <libavformat/avformat.h>
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#include <libavutil/opt.h>
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static AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL;
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static AVBufferRef *hw_device_ctx = NULL;
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static AVCodecContext *decoder_ctx = NULL, *encoder_ctx = NULL;
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static int video_stream = -1;
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typedef struct DynamicSetting {
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int frame_number;
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char* optstr;
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} DynamicSetting;
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static DynamicSetting *dynamic_setting;
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static int setting_number;
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static int current_setting_number;
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static int str_to_dict(char* optstr, AVDictionary **opt)
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{
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char *key, *value;
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if (strlen(optstr) == 0)
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return 0;
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key = strtok(optstr, " ");
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if (key == NULL)
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return AVERROR(ENAVAIL);
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value = strtok(NULL, " ");
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if (value == NULL)
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return AVERROR(ENAVAIL);
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av_dict_set(opt, key, value, 0);
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do {
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key = strtok(NULL, " ");
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if (key == NULL)
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return 0;
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value = strtok(NULL, " ");
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if (value == NULL)
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return AVERROR(ENAVAIL);
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av_dict_set(opt, key, value, 0);
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} while(key != NULL);
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return 0;
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}
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static int dynamic_set_parameter(AVCodecContext *avctx)
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{
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AVDictionary *opts = NULL;
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int ret = 0;
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static int frame_number = 0;
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frame_number++;
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if (current_setting_number < setting_number &&
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frame_number == dynamic_setting[current_setting_number].frame_number) {
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AVDictionaryEntry *e = NULL;
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ret = str_to_dict(dynamic_setting[current_setting_number++].optstr, &opts);
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if (ret < 0) {
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fprintf(stderr, "The dynamic parameter is wrong\n");
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goto fail;
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}
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/* Set common option. The dictionary will be freed and replaced
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* by a new one containing all options not found in common option list.
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* Then this new dictionary is used to set private option. */
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if ((ret = av_opt_set_dict(avctx, &opts)) < 0)
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goto fail;
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/* Set codec specific option */
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if ((ret = av_opt_set_dict(avctx->priv_data, &opts)) < 0)
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goto fail;
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/* There is no "framerate" option in commom option list. Use "-r" to set
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* framerate, which is compatible with ffmpeg commandline. The video is
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* assumed to be average frame rate, so set time_base to 1/framerate. */
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e = av_dict_get(opts, "r", NULL, 0);
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if (e) {
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avctx->framerate = av_d2q(atof(e->value), INT_MAX);
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encoder_ctx->time_base = av_inv_q(encoder_ctx->framerate);
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}
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}
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fail:
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av_dict_free(&opts);
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return ret;
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}
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static int get_format(AVCodecContext *avctx, const enum AVPixelFormat *pix_fmts)
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{
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while (*pix_fmts != AV_PIX_FMT_NONE) {
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if (*pix_fmts == AV_PIX_FMT_QSV) {
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return AV_PIX_FMT_QSV;
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}
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pix_fmts++;
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}
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fprintf(stderr, "The QSV pixel format not offered in get_format()\n");
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return AV_PIX_FMT_NONE;
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}
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static int open_input_file(char *filename)
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{
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int ret;
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const AVCodec *decoder = NULL;
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AVStream *video = NULL;
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if ((ret = avformat_open_input(&ifmt_ctx, filename, NULL, NULL)) < 0) {
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fprintf(stderr, "Cannot open input file '%s', Error code: %s\n",
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filename, av_err2str(ret));
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return ret;
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}
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if ((ret = avformat_find_stream_info(ifmt_ctx, NULL)) < 0) {
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fprintf(stderr, "Cannot find input stream information. Error code: %s\n",
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av_err2str(ret));
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return ret;
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}
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ret = av_find_best_stream(ifmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, NULL, 0);
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if (ret < 0) {
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fprintf(stderr, "Cannot find a video stream in the input file. "
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"Error code: %s\n", av_err2str(ret));
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return ret;
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}
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video_stream = ret;
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video = ifmt_ctx->streams[video_stream];
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switch(video->codecpar->codec_id) {
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case AV_CODEC_ID_H264:
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decoder = avcodec_find_decoder_by_name("h264_qsv");
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break;
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case AV_CODEC_ID_HEVC:
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decoder = avcodec_find_decoder_by_name("hevc_qsv");
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break;
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case AV_CODEC_ID_VP9:
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decoder = avcodec_find_decoder_by_name("vp9_qsv");
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break;
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case AV_CODEC_ID_VP8:
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decoder = avcodec_find_decoder_by_name("vp8_qsv");
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break;
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case AV_CODEC_ID_AV1:
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decoder = avcodec_find_decoder_by_name("av1_qsv");
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break;
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case AV_CODEC_ID_MPEG2VIDEO:
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decoder = avcodec_find_decoder_by_name("mpeg2_qsv");
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break;
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case AV_CODEC_ID_MJPEG:
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decoder = avcodec_find_decoder_by_name("mjpeg_qsv");
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break;
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default:
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fprintf(stderr, "Codec is not supportted by qsv\n");
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return AVERROR(ENAVAIL);
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}
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if (!(decoder_ctx = avcodec_alloc_context3(decoder)))
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return AVERROR(ENOMEM);
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if ((ret = avcodec_parameters_to_context(decoder_ctx, video->codecpar)) < 0) {
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fprintf(stderr, "avcodec_parameters_to_context error. Error code: %s\n",
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av_err2str(ret));
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return ret;
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}
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decoder_ctx->framerate = av_guess_frame_rate(ifmt_ctx, video, NULL);
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decoder_ctx->hw_device_ctx = av_buffer_ref(hw_device_ctx);
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if (!decoder_ctx->hw_device_ctx) {
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fprintf(stderr, "A hardware device reference create failed.\n");
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return AVERROR(ENOMEM);
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}
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decoder_ctx->get_format = get_format;
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decoder_ctx->pkt_timebase = video->time_base;
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if ((ret = avcodec_open2(decoder_ctx, decoder, NULL)) < 0)
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fprintf(stderr, "Failed to open codec for decoding. Error code: %s\n",
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av_err2str(ret));
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return ret;
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}
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static int encode_write(AVPacket *enc_pkt, AVFrame *frame)
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{
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int ret = 0;
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av_packet_unref(enc_pkt);
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if((ret = dynamic_set_parameter(encoder_ctx)) < 0) {
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fprintf(stderr, "Failed to set dynamic parameter. Error code: %s\n",
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av_err2str(ret));
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goto end;
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}
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if ((ret = avcodec_send_frame(encoder_ctx, frame)) < 0) {
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fprintf(stderr, "Error during encoding. Error code: %s\n", av_err2str(ret));
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goto end;
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}
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while (1) {
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if (ret = avcodec_receive_packet(encoder_ctx, enc_pkt))
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break;
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enc_pkt->stream_index = 0;
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av_packet_rescale_ts(enc_pkt, encoder_ctx->time_base,
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ofmt_ctx->streams[0]->time_base);
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if ((ret = av_interleaved_write_frame(ofmt_ctx, enc_pkt)) < 0) {
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fprintf(stderr, "Error during writing data to output file. "
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"Error code: %s\n", av_err2str(ret));
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return ret;
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}
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}
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end:
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if (ret == AVERROR_EOF)
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return 0;
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ret = ((ret == AVERROR(EAGAIN)) ? 0:-1);
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return ret;
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}
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static int dec_enc(AVPacket *pkt, const AVCodec *enc_codec, char *optstr)
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{
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AVFrame *frame;
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int ret = 0;
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ret = avcodec_send_packet(decoder_ctx, pkt);
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if (ret < 0) {
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fprintf(stderr, "Error during decoding. Error code: %s\n", av_err2str(ret));
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return ret;
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}
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while (ret >= 0) {
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if (!(frame = av_frame_alloc()))
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return AVERROR(ENOMEM);
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ret = avcodec_receive_frame(decoder_ctx, frame);
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if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
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av_frame_free(&frame);
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return 0;
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} else if (ret < 0) {
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fprintf(stderr, "Error while decoding. Error code: %s\n", av_err2str(ret));
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goto fail;
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}
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if (!encoder_ctx->hw_frames_ctx) {
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AVDictionaryEntry *e = NULL;
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AVDictionary *opts = NULL;
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AVStream *ost;
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/* we need to ref hw_frames_ctx of decoder to initialize encoder's codec.
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Only after we get a decoded frame, can we obtain its hw_frames_ctx */
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encoder_ctx->hw_frames_ctx = av_buffer_ref(decoder_ctx->hw_frames_ctx);
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if (!encoder_ctx->hw_frames_ctx) {
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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/* set AVCodecContext Parameters for encoder, here we keep them stay
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* the same as decoder.
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*/
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encoder_ctx->time_base = av_inv_q(decoder_ctx->framerate);
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encoder_ctx->pix_fmt = AV_PIX_FMT_QSV;
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encoder_ctx->width = decoder_ctx->width;
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encoder_ctx->height = decoder_ctx->height;
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if ((ret = str_to_dict(optstr, &opts)) < 0) {
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fprintf(stderr, "Failed to set encoding parameter.\n");
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goto fail;
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}
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/* There is no "framerate" option in commom option list. Use "-r" to
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* set framerate, which is compatible with ffmpeg commandline. The
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* video is assumed to be average frame rate, so set time_base to
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* 1/framerate. */
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e = av_dict_get(opts, "r", NULL, 0);
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if (e) {
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encoder_ctx->framerate = av_d2q(atof(e->value), INT_MAX);
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encoder_ctx->time_base = av_inv_q(encoder_ctx->framerate);
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}
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if ((ret = avcodec_open2(encoder_ctx, enc_codec, &opts)) < 0) {
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fprintf(stderr, "Failed to open encode codec. Error code: %s\n",
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av_err2str(ret));
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av_dict_free(&opts);
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goto fail;
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}
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av_dict_free(&opts);
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if (!(ost = avformat_new_stream(ofmt_ctx, enc_codec))) {
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fprintf(stderr, "Failed to allocate stream for output format.\n");
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ret = AVERROR(ENOMEM);
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goto fail;
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}
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ost->time_base = encoder_ctx->time_base;
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ret = avcodec_parameters_from_context(ost->codecpar, encoder_ctx);
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if (ret < 0) {
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fprintf(stderr, "Failed to copy the stream parameters. "
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"Error code: %s\n", av_err2str(ret));
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goto fail;
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}
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/* write the stream header */
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if ((ret = avformat_write_header(ofmt_ctx, NULL)) < 0) {
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fprintf(stderr, "Error while writing stream header. "
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"Error code: %s\n", av_err2str(ret));
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goto fail;
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}
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}
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frame->pts = av_rescale_q(frame->pts, decoder_ctx->pkt_timebase,
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encoder_ctx->time_base);
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if ((ret = encode_write(pkt, frame)) < 0)
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fprintf(stderr, "Error during encoding and writing.\n");
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fail:
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av_frame_free(&frame);
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if (ret < 0)
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return ret;
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}
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return 0;
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}
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int main(int argc, char **argv)
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{
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const AVCodec *enc_codec;
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int ret = 0;
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AVPacket *dec_pkt;
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if (argc < 5 || (argc - 5) % 2) {
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av_log(NULL, AV_LOG_ERROR, "Usage: %s <input file> <encoder> <output file>"
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" <\"encoding option set 0\"> [<frame_number> <\"encoding options set 1\">]...\n", argv[0]);
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return 1;
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}
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setting_number = (argc - 5) / 2;
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dynamic_setting = av_malloc(setting_number * sizeof(*dynamic_setting));
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current_setting_number = 0;
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for (int i = 0; i < setting_number; i++) {
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dynamic_setting[i].frame_number = atoi(argv[i*2 + 5]);
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dynamic_setting[i].optstr = argv[i*2 + 6];
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}
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ret = av_hwdevice_ctx_create(&hw_device_ctx, AV_HWDEVICE_TYPE_QSV, NULL, NULL, 0);
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if (ret < 0) {
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fprintf(stderr, "Failed to create a QSV device. Error code: %s\n", av_err2str(ret));
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goto end;
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}
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dec_pkt = av_packet_alloc();
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if (!dec_pkt) {
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fprintf(stderr, "Failed to allocate decode packet\n");
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goto end;
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}
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if ((ret = open_input_file(argv[1])) < 0)
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goto end;
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if (!(enc_codec = avcodec_find_encoder_by_name(argv[2]))) {
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fprintf(stderr, "Could not find encoder '%s'\n", argv[2]);
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ret = -1;
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goto end;
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}
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if ((ret = (avformat_alloc_output_context2(&ofmt_ctx, NULL, NULL, argv[3]))) < 0) {
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fprintf(stderr, "Failed to deduce output format from file extension. Error code: "
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"%s\n", av_err2str(ret));
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goto end;
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}
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if (!(encoder_ctx = avcodec_alloc_context3(enc_codec))) {
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ret = AVERROR(ENOMEM);
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goto end;
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}
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ret = avio_open(&ofmt_ctx->pb, argv[3], AVIO_FLAG_WRITE);
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if (ret < 0) {
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fprintf(stderr, "Cannot open output file. "
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"Error code: %s\n", av_err2str(ret));
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goto end;
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}
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/* read all packets and only transcoding video */
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while (ret >= 0) {
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if ((ret = av_read_frame(ifmt_ctx, dec_pkt)) < 0)
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break;
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if (video_stream == dec_pkt->stream_index)
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ret = dec_enc(dec_pkt, enc_codec, argv[4]);
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av_packet_unref(dec_pkt);
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}
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/* flush decoder */
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av_packet_unref(dec_pkt);
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if ((ret = dec_enc(dec_pkt, enc_codec, argv[4])) < 0) {
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fprintf(stderr, "Failed to flush decoder %s\n", av_err2str(ret));
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goto end;
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}
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/* flush encoder */
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if ((ret = encode_write(dec_pkt, NULL)) < 0) {
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fprintf(stderr, "Failed to flush encoder %s\n", av_err2str(ret));
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goto end;
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}
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/* write the trailer for output stream */
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if ((ret = av_write_trailer(ofmt_ctx)) < 0)
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fprintf(stderr, "Failed to write trailer %s\n", av_err2str(ret));
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end:
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avformat_close_input(&ifmt_ctx);
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avformat_close_input(&ofmt_ctx);
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avcodec_free_context(&decoder_ctx);
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avcodec_free_context(&encoder_ctx);
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av_buffer_unref(&hw_device_ctx);
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av_packet_free(&dec_pkt);
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av_freep(&dynamic_setting);
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return ret;
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}
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