| /* |
| * 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 video transcoding API usage example |
| * @example qsv_transcode.c |
| * |
| * Perform QSV-accelerated transcoding and show to dynamically change |
| * encoder's options. |
| * |
| * 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 <libavutil/mem.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(EINVAL); |
| value = strtok(NULL, " "); |
| if (value == NULL) |
| return AVERROR(EINVAL); |
| av_dict_set(opt, key, value, 0); |
| do { |
| key = strtok(NULL, " "); |
| if (key == NULL) |
| return 0; |
| value = strtok(NULL, " "); |
| if (value == NULL) |
| return AVERROR(EINVAL); |
| av_dict_set(opt, key, value, 0); |
| } while(1); |
| } |
| |
| 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 common 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 supported by qsv\n"); |
| return AVERROR(EINVAL); |
| } |
| |
| 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 common 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); |
| } |
| return ret; |
| } |
| |
| int main(int argc, char **argv) |
| { |
| const AVCodec *enc_codec; |
| int ret = 0; |
| AVPacket *dec_pkt = NULL; |
| |
| 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; |
| } |
