| /* |
| * Video Acceleration API (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 VAAPI-accelerated transcoding example. |
| * |
| * @example vaapi_transcode.c |
| * This example shows how to do VAAPI-accelerated transcoding. |
| * Usage: vaapi_transcode input_stream codec output_stream |
| * e.g: - vaapi_transcode input.mp4 h264_vaapi output_h264.mp4 |
| * - vaapi_transcode input.mp4 vp9_vaapi output_vp9.ivf |
| */ |
| |
| #include <stdio.h> |
| #include <errno.h> |
| |
| #include <libavutil/hwcontext.h> |
| #include <libavcodec/avcodec.h> |
| #include <libavformat/avformat.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; |
| static AVStream *ost; |
| static int initialized = 0; |
| |
| static enum AVPixelFormat get_vaapi_format(AVCodecContext *ctx, |
| const enum AVPixelFormat *pix_fmts) |
| { |
| const enum AVPixelFormat *p; |
| |
| for (p = pix_fmts; *p != AV_PIX_FMT_NONE; p++) { |
| if (*p == AV_PIX_FMT_VAAPI) |
| return *p; |
| } |
| |
| fprintf(stderr, "Unable to decode this file using VA-API.\n"); |
| return AV_PIX_FMT_NONE; |
| } |
| |
| static int open_input_file(const char *filename) |
| { |
| int ret; |
| 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, &decoder, 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; |
| |
| if (!(decoder_ctx = avcodec_alloc_context3(decoder))) |
| return AVERROR(ENOMEM); |
| |
| video = ifmt_ctx->streams[video_stream]; |
| 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->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_vaapi_format; |
| |
| 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(AVFrame *frame) |
| { |
| int ret = 0; |
| AVPacket enc_pkt; |
| |
| av_init_packet(&enc_pkt); |
| enc_pkt.data = NULL; |
| enc_pkt.size = 0; |
| |
| 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) { |
| ret = avcodec_receive_packet(encoder_ctx, &enc_pkt); |
| if (ret) |
| break; |
| |
| enc_pkt.stream_index = 0; |
| av_packet_rescale_ts(&enc_pkt, ifmt_ctx->streams[video_stream]->time_base, |
| ofmt_ctx->streams[0]->time_base); |
| ret = av_interleaved_write_frame(ofmt_ctx, &enc_pkt); |
| if (ret < 0) { |
| fprintf(stderr, "Error during writing data to output file. " |
| "Error code: %s\n", av_err2str(ret)); |
| return -1; |
| } |
| } |
| |
| end: |
| if (ret == AVERROR_EOF) |
| return 0; |
| ret = ((ret == AVERROR(EAGAIN)) ? 0:-1); |
| return ret; |
| } |
| |
| static int dec_enc(AVPacket *pkt, AVCodec *enc_codec) |
| { |
| 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 (!initialized) { |
| /* 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. |
| * xxx: now the sample can't handle resolution change case. |
| */ |
| encoder_ctx->time_base = av_inv_q(decoder_ctx->framerate); |
| encoder_ctx->pix_fmt = AV_PIX_FMT_VAAPI; |
| encoder_ctx->width = decoder_ctx->width; |
| encoder_ctx->height = decoder_ctx->height; |
| |
| if ((ret = avcodec_open2(encoder_ctx, enc_codec, NULL)) < 0) { |
| fprintf(stderr, "Failed to open encode codec. Error code: %s\n", |
| av_err2str(ret)); |
| goto fail; |
| } |
| |
| 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; |
| } |
| |
| initialized = 1; |
| } |
| |
| if ((ret = encode_write(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) |
| { |
| int ret = 0; |
| AVPacket dec_pkt; |
| AVCodec *enc_codec; |
| |
| if (argc != 4) { |
| fprintf(stderr, "Usage: %s <input file> <encode codec> <output file>\n" |
| "The output format is guessed according to the file extension.\n" |
| "\n", argv[0]); |
| return -1; |
| } |
| |
| ret = av_hwdevice_ctx_create(&hw_device_ctx, AV_HWDEVICE_TYPE_VAAPI, NULL, NULL, 0); |
| if (ret < 0) { |
| fprintf(stderr, "Failed to create a VAAPI device. Error code: %s\n", av_err2str(ret)); |
| return -1; |
| } |
| |
| 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); |
| |
| av_packet_unref(&dec_pkt); |
| } |
| |
| /* flush decoder */ |
| dec_pkt.data = NULL; |
| dec_pkt.size = 0; |
| ret = dec_enc(&dec_pkt, enc_codec); |
| av_packet_unref(&dec_pkt); |
| |
| /* flush encoder */ |
| ret = encode_write(NULL); |
| |
| /* write the trailer for output stream */ |
| av_write_trailer(ofmt_ctx); |
| |
| 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); |
| return ret; |
| } |