tool/VideoPlayer.git

New file
			@@ -0,0 +1,306 @@
			/*
			* 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;
			}