From 4a6d9312cc1c9d62d66c4def71246d9faae29edb Mon Sep 17 00:00:00 2001
From: zhangmeng <775834166@qq.com>
Date: 星期三, 03 三月 2021 14:26:16 +0800
Subject: [PATCH] environment settings
---
module/VideoPlayer/lib/linux/ffmpeg/share/ffmpeg/examples/filtering_video.c | 291 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 291 insertions(+), 0 deletions(-)
diff --git a/module/VideoPlayer/lib/linux/ffmpeg/share/ffmpeg/examples/filtering_video.c b/module/VideoPlayer/lib/linux/ffmpeg/share/ffmpeg/examples/filtering_video.c
new file mode 100644
index 0000000..105a200
--- /dev/null
+++ b/module/VideoPlayer/lib/linux/ffmpeg/share/ffmpeg/examples/filtering_video.c
@@ -0,0 +1,291 @@
+/*
+ * Copyright (c) 2010 Nicolas George
+ * Copyright (c) 2011 Stefano Sabatini
+ *
+ * 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
+ * API example for decoding and filtering
+ * @example filtering_video.c
+ */
+
+#define _XOPEN_SOURCE 600 /* for usleep */
+#include <unistd.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#include <libavcodec/avcodec.h>
+#include <libavformat/avformat.h>
+#include <libavfilter/buffersink.h>
+#include <libavfilter/buffersrc.h>
+#include <libavutil/opt.h>
+
+const char *filter_descr = "scale=78:24,transpose=cclock";
+/* other way:
+ scale=78:24 [scl]; [scl] transpose=cclock // assumes "[in]" and "[out]" to be input output pads respectively
+ */
+
+static AVFormatContext *fmt_ctx;
+static AVCodecContext *dec_ctx;
+AVFilterContext *buffersink_ctx;
+AVFilterContext *buffersrc_ctx;
+AVFilterGraph *filter_graph;
+static int video_stream_index = -1;
+static int64_t last_pts = AV_NOPTS_VALUE;
+
+static int open_input_file(const char *filename)
+{
+ int ret;
+ AVCodec *dec;
+
+ if ((ret = avformat_open_input(&fmt_ctx, filename, NULL, NULL)) < 0) {
+ av_log(NULL, AV_LOG_ERROR, "Cannot open input file\n");
+ return ret;
+ }
+
+ if ((ret = avformat_find_stream_info(fmt_ctx, NULL)) < 0) {
+ av_log(NULL, AV_LOG_ERROR, "Cannot find stream information\n");
+ return ret;
+ }
+
+ /* select the video stream */
+ ret = av_find_best_stream(fmt_ctx, AVMEDIA_TYPE_VIDEO, -1, -1, &dec, 0);
+ if (ret < 0) {
+ av_log(NULL, AV_LOG_ERROR, "Cannot find a video stream in the input file\n");
+ return ret;
+ }
+ video_stream_index = ret;
+
+ /* create decoding context */
+ dec_ctx = avcodec_alloc_context3(dec);
+ if (!dec_ctx)
+ return AVERROR(ENOMEM);
+ avcodec_parameters_to_context(dec_ctx, fmt_ctx->streams[video_stream_index]->codecpar);
+
+ /* init the video decoder */
+ if ((ret = avcodec_open2(dec_ctx, dec, NULL)) < 0) {
+ av_log(NULL, AV_LOG_ERROR, "Cannot open video decoder\n");
+ return ret;
+ }
+
+ return 0;
+}
+
+static int init_filters(const char *filters_descr)
+{
+ char args[512];
+ int ret = 0;
+ const AVFilter *buffersrc = avfilter_get_by_name("buffer");
+ const AVFilter *buffersink = avfilter_get_by_name("buffersink");
+ AVFilterInOut *outputs = avfilter_inout_alloc();
+ AVFilterInOut *inputs = avfilter_inout_alloc();
+ AVRational time_base = fmt_ctx->streams[video_stream_index]->time_base;
+ enum AVPixelFormat pix_fmts[] = { AV_PIX_FMT_GRAY8, AV_PIX_FMT_NONE };
+
+ filter_graph = avfilter_graph_alloc();
+ if (!outputs || !inputs || !filter_graph) {
+ ret = AVERROR(ENOMEM);
+ goto end;
+ }
+
+ /* buffer video source: the decoded frames from the decoder will be inserted here. */
+ snprintf(args, sizeof(args),
+ "video_size=%dx%d:pix_fmt=%d:time_base=%d/%d:pixel_aspect=%d/%d",
+ dec_ctx->width, dec_ctx->height, dec_ctx->pix_fmt,
+ time_base.num, time_base.den,
+ dec_ctx->sample_aspect_ratio.num, dec_ctx->sample_aspect_ratio.den);
+
+ ret = avfilter_graph_create_filter(&buffersrc_ctx, buffersrc, "in",
+ args, NULL, filter_graph);
+ if (ret < 0) {
+ av_log(NULL, AV_LOG_ERROR, "Cannot create buffer source\n");
+ goto end;
+ }
+
+ /* buffer video sink: to terminate the filter chain. */
+ ret = avfilter_graph_create_filter(&buffersink_ctx, buffersink, "out",
+ NULL, NULL, filter_graph);
+ if (ret < 0) {
+ av_log(NULL, AV_LOG_ERROR, "Cannot create buffer sink\n");
+ goto end;
+ }
+
+ ret = av_opt_set_int_list(buffersink_ctx, "pix_fmts", pix_fmts,
+ AV_PIX_FMT_NONE, AV_OPT_SEARCH_CHILDREN);
+ if (ret < 0) {
+ av_log(NULL, AV_LOG_ERROR, "Cannot set output pixel format\n");
+ goto end;
+ }
+
+ /*
+ * Set the endpoints for the filter graph. The filter_graph will
+ * be linked to the graph described by filters_descr.
+ */
+
+ /*
+ * The buffer source output must be connected to the input pad of
+ * the first filter described by filters_descr; since the first
+ * filter input label is not specified, it is set to "in" by
+ * default.
+ */
+ outputs->name = av_strdup("in");
+ outputs->filter_ctx = buffersrc_ctx;
+ outputs->pad_idx = 0;
+ outputs->next = NULL;
+
+ /*
+ * The buffer sink input must be connected to the output pad of
+ * the last filter described by filters_descr; since the last
+ * filter output label is not specified, it is set to "out" by
+ * default.
+ */
+ inputs->name = av_strdup("out");
+ inputs->filter_ctx = buffersink_ctx;
+ inputs->pad_idx = 0;
+ inputs->next = NULL;
+
+ if ((ret = avfilter_graph_parse_ptr(filter_graph, filters_descr,
+ &inputs, &outputs, NULL)) < 0)
+ goto end;
+
+ if ((ret = avfilter_graph_config(filter_graph, NULL)) < 0)
+ goto end;
+
+end:
+ avfilter_inout_free(&inputs);
+ avfilter_inout_free(&outputs);
+
+ return ret;
+}
+
+static void display_frame(const AVFrame *frame, AVRational time_base)
+{
+ int x, y;
+ uint8_t *p0, *p;
+ int64_t delay;
+
+ if (frame->pts != AV_NOPTS_VALUE) {
+ if (last_pts != AV_NOPTS_VALUE) {
+ /* sleep roughly the right amount of time;
+ * usleep is in microseconds, just like AV_TIME_BASE. */
+ delay = av_rescale_q(frame->pts - last_pts,
+ time_base, AV_TIME_BASE_Q);
+ if (delay > 0 && delay < 1000000)
+ usleep(delay);
+ }
+ last_pts = frame->pts;
+ }
+
+ /* Trivial ASCII grayscale display. */
+ p0 = frame->data[0];
+ puts("\033c");
+ for (y = 0; y < frame->height; y++) {
+ p = p0;
+ for (x = 0; x < frame->width; x++)
+ putchar(" .-+#"[*(p++) / 52]);
+ putchar('\n');
+ p0 += frame->linesize[0];
+ }
+ fflush(stdout);
+}
+
+int main(int argc, char **argv)
+{
+ int ret;
+ AVPacket packet;
+ AVFrame *frame;
+ AVFrame *filt_frame;
+
+ if (argc != 2) {
+ fprintf(stderr, "Usage: %s file\n", argv[0]);
+ exit(1);
+ }
+
+ frame = av_frame_alloc();
+ filt_frame = av_frame_alloc();
+ if (!frame || !filt_frame) {
+ perror("Could not allocate frame");
+ exit(1);
+ }
+
+ if ((ret = open_input_file(argv[1])) < 0)
+ goto end;
+ if ((ret = init_filters(filter_descr)) < 0)
+ goto end;
+
+ /* read all packets */
+ while (1) {
+ if ((ret = av_read_frame(fmt_ctx, &packet)) < 0)
+ break;
+
+ if (packet.stream_index == video_stream_index) {
+ ret = avcodec_send_packet(dec_ctx, &packet);
+ if (ret < 0) {
+ av_log(NULL, AV_LOG_ERROR, "Error while sending a packet to the decoder\n");
+ break;
+ }
+
+ while (ret >= 0) {
+ ret = avcodec_receive_frame(dec_ctx, frame);
+ if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF) {
+ break;
+ } else if (ret < 0) {
+ av_log(NULL, AV_LOG_ERROR, "Error while receiving a frame from the decoder\n");
+ goto end;
+ }
+
+ frame->pts = frame->best_effort_timestamp;
+
+ /* push the decoded frame into the filtergraph */
+ if (av_buffersrc_add_frame_flags(buffersrc_ctx, frame, AV_BUFFERSRC_FLAG_KEEP_REF) < 0) {
+ av_log(NULL, AV_LOG_ERROR, "Error while feeding the filtergraph\n");
+ break;
+ }
+
+ /* pull filtered frames from the filtergraph */
+ while (1) {
+ ret = av_buffersink_get_frame(buffersink_ctx, filt_frame);
+ if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
+ break;
+ if (ret < 0)
+ goto end;
+ display_frame(filt_frame, buffersink_ctx->inputs[0]->time_base);
+ av_frame_unref(filt_frame);
+ }
+ av_frame_unref(frame);
+ }
+ }
+ av_packet_unref(&packet);
+ }
+end:
+ avfilter_graph_free(&filter_graph);
+ avcodec_free_context(&dec_ctx);
+ avformat_close_input(&fmt_ctx);
+ av_frame_free(&frame);
+ av_frame_free(&filt_frame);
+
+ if (ret < 0 && ret != AVERROR_EOF) {
+ fprintf(stderr, "Error occurred: %s\n", av_err2str(ret));
+ exit(1);
+ }
+
+ exit(0);
+}
--
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