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/encode_video.c | 197 +++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 197 insertions(+), 0 deletions(-)
diff --git a/module/VideoPlayer/lib/linux/ffmpeg/share/ffmpeg/examples/encode_video.c b/module/VideoPlayer/lib/linux/ffmpeg/share/ffmpeg/examples/encode_video.c
new file mode 100644
index 0000000..6731b2a
--- /dev/null
+++ b/module/VideoPlayer/lib/linux/ffmpeg/share/ffmpeg/examples/encode_video.c
@@ -0,0 +1,197 @@
+/*
+ * Copyright (c) 2001 Fabrice Bellard
+ *
+ * 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
+ * video encoding with libavcodec API example
+ *
+ * @example encode_video.c
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <libavcodec/avcodec.h>
+
+#include <libavutil/opt.h>
+#include <libavutil/imgutils.h>
+
+static void encode(AVCodecContext *enc_ctx, AVFrame *frame, AVPacket *pkt,
+ FILE *outfile)
+{
+ int ret;
+
+ /* send the frame to the encoder */
+ if (frame)
+ printf("Send frame %3"PRId64"\n", frame->pts);
+
+ ret = avcodec_send_frame(enc_ctx, frame);
+ if (ret < 0) {
+ fprintf(stderr, "Error sending a frame for encoding\n");
+ exit(1);
+ }
+
+ while (ret >= 0) {
+ ret = avcodec_receive_packet(enc_ctx, pkt);
+ if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
+ return;
+ else if (ret < 0) {
+ fprintf(stderr, "Error during encoding\n");
+ exit(1);
+ }
+
+ printf("Write packet %3"PRId64" (size=%5d)\n", pkt->pts, pkt->size);
+ fwrite(pkt->data, 1, pkt->size, outfile);
+ av_packet_unref(pkt);
+ }
+}
+
+int main(int argc, char **argv)
+{
+ const char *filename, *codec_name;
+ const AVCodec *codec;
+ AVCodecContext *c= NULL;
+ int i, ret, x, y;
+ FILE *f;
+ AVFrame *frame;
+ AVPacket *pkt;
+ uint8_t endcode[] = { 0, 0, 1, 0xb7 };
+
+ if (argc <= 2) {
+ fprintf(stderr, "Usage: %s <output file> <codec name>\n", argv[0]);
+ exit(0);
+ }
+ filename = argv[1];
+ codec_name = argv[2];
+
+ /* find the mpeg1video encoder */
+ codec = avcodec_find_encoder_by_name(codec_name);
+ if (!codec) {
+ fprintf(stderr, "Codec '%s' not found\n", codec_name);
+ exit(1);
+ }
+
+ c = avcodec_alloc_context3(codec);
+ if (!c) {
+ fprintf(stderr, "Could not allocate video codec context\n");
+ exit(1);
+ }
+
+ pkt = av_packet_alloc();
+ if (!pkt)
+ exit(1);
+
+ /* put sample parameters */
+ c->bit_rate = 400000;
+ /* resolution must be a multiple of two */
+ c->width = 352;
+ c->height = 288;
+ /* frames per second */
+ c->time_base = (AVRational){1, 25};
+ c->framerate = (AVRational){25, 1};
+
+ /* emit one intra frame every ten frames
+ * check frame pict_type before passing frame
+ * to encoder, if frame->pict_type is AV_PICTURE_TYPE_I
+ * then gop_size is ignored and the output of encoder
+ * will always be I frame irrespective to gop_size
+ */
+ c->gop_size = 10;
+ c->max_b_frames = 1;
+ c->pix_fmt = AV_PIX_FMT_YUV420P;
+
+ if (codec->id == AV_CODEC_ID_H264)
+ av_opt_set(c->priv_data, "preset", "slow", 0);
+
+ /* open it */
+ ret = avcodec_open2(c, codec, NULL);
+ if (ret < 0) {
+ fprintf(stderr, "Could not open codec: %s\n", av_err2str(ret));
+ exit(1);
+ }
+
+ f = fopen(filename, "wb");
+ if (!f) {
+ fprintf(stderr, "Could not open %s\n", filename);
+ exit(1);
+ }
+
+ frame = av_frame_alloc();
+ if (!frame) {
+ fprintf(stderr, "Could not allocate video frame\n");
+ exit(1);
+ }
+ frame->format = c->pix_fmt;
+ frame->width = c->width;
+ frame->height = c->height;
+
+ ret = av_frame_get_buffer(frame, 32);
+ if (ret < 0) {
+ fprintf(stderr, "Could not allocate the video frame data\n");
+ exit(1);
+ }
+
+ /* encode 1 second of video */
+ for (i = 0; i < 25; i++) {
+ fflush(stdout);
+
+ /* make sure the frame data is writable */
+ ret = av_frame_make_writable(frame);
+ if (ret < 0)
+ exit(1);
+
+ /* prepare a dummy image */
+ /* Y */
+ for (y = 0; y < c->height; y++) {
+ for (x = 0; x < c->width; x++) {
+ frame->data[0][y * frame->linesize[0] + x] = x + y + i * 3;
+ }
+ }
+
+ /* Cb and Cr */
+ for (y = 0; y < c->height/2; y++) {
+ for (x = 0; x < c->width/2; x++) {
+ frame->data[1][y * frame->linesize[1] + x] = 128 + y + i * 2;
+ frame->data[2][y * frame->linesize[2] + x] = 64 + x + i * 5;
+ }
+ }
+
+ frame->pts = i;
+
+ /* encode the image */
+ encode(c, frame, pkt, f);
+ }
+
+ /* flush the encoder */
+ encode(c, NULL, pkt, f);
+
+ /* add sequence end code to have a real MPEG file */
+ fwrite(endcode, 1, sizeof(endcode), f);
+ fclose(f);
+
+ avcodec_free_context(&c);
+ av_frame_free(&frame);
+ av_packet_free(&pkt);
+
+ return 0;
+}
--
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