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/decode_video.c | 186 ++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 186 insertions(+), 0 deletions(-)
diff --git a/module/VideoPlayer/lib/linux/ffmpeg/share/ffmpeg/examples/decode_video.c b/module/VideoPlayer/lib/linux/ffmpeg/share/ffmpeg/examples/decode_video.c
new file mode 100644
index 0000000..5a9d43f
--- /dev/null
+++ b/module/VideoPlayer/lib/linux/ffmpeg/share/ffmpeg/examples/decode_video.c
@@ -0,0 +1,186 @@
+/*
+ * 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 decoding with libavcodec API example
+ *
+ * @example decode_video.c
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include <libavcodec/avcodec.h>
+
+#define INBUF_SIZE 4096
+
+static void pgm_save(unsigned char *buf, int wrap, int xsize, int ysize,
+ char *filename)
+{
+ FILE *f;
+ int i;
+
+ f = fopen(filename,"w");
+ fprintf(f, "P5\n%d %d\n%d\n", xsize, ysize, 255);
+ for (i = 0; i < ysize; i++)
+ fwrite(buf + i * wrap, 1, xsize, f);
+ fclose(f);
+}
+
+static void decode(AVCodecContext *dec_ctx, AVFrame *frame, AVPacket *pkt,
+ const char *filename)
+{
+ char buf[1024];
+ int ret;
+
+ ret = avcodec_send_packet(dec_ctx, pkt);
+ if (ret < 0) {
+ fprintf(stderr, "Error sending a packet for decoding\n");
+ exit(1);
+ }
+
+ while (ret >= 0) {
+ ret = avcodec_receive_frame(dec_ctx, frame);
+ if (ret == AVERROR(EAGAIN) || ret == AVERROR_EOF)
+ return;
+ else if (ret < 0) {
+ fprintf(stderr, "Error during decoding\n");
+ exit(1);
+ }
+
+ printf("saving frame %3d\n", dec_ctx->frame_number);
+ fflush(stdout);
+
+ /* the picture is allocated by the decoder. no need to
+ free it */
+ snprintf(buf, sizeof(buf), "%s-%d", filename, dec_ctx->frame_number);
+ pgm_save(frame->data[0], frame->linesize[0],
+ frame->width, frame->height, buf);
+ }
+}
+
+int main(int argc, char **argv)
+{
+ const char *filename, *outfilename;
+ const AVCodec *codec;
+ AVCodecParserContext *parser;
+ AVCodecContext *c= NULL;
+ FILE *f;
+ AVFrame *frame;
+ uint8_t inbuf[INBUF_SIZE + AV_INPUT_BUFFER_PADDING_SIZE];
+ uint8_t *data;
+ size_t data_size;
+ int ret;
+ AVPacket *pkt;
+
+ if (argc <= 2) {
+ fprintf(stderr, "Usage: %s <input file> <output file>\n", argv[0]);
+ exit(0);
+ }
+ filename = argv[1];
+ outfilename = argv[2];
+
+ pkt = av_packet_alloc();
+ if (!pkt)
+ exit(1);
+
+ /* set end of buffer to 0 (this ensures that no overreading happens for damaged MPEG streams) */
+ memset(inbuf + INBUF_SIZE, 0, AV_INPUT_BUFFER_PADDING_SIZE);
+
+ /* find the MPEG-1 video decoder */
+ codec = avcodec_find_decoder(AV_CODEC_ID_MPEG1VIDEO);
+ if (!codec) {
+ fprintf(stderr, "Codec not found\n");
+ exit(1);
+ }
+
+ parser = av_parser_init(codec->id);
+ if (!parser) {
+ fprintf(stderr, "parser not found\n");
+ exit(1);
+ }
+
+ c = avcodec_alloc_context3(codec);
+ if (!c) {
+ fprintf(stderr, "Could not allocate video codec context\n");
+ exit(1);
+ }
+
+ /* For some codecs, such as msmpeg4 and mpeg4, width and height
+ MUST be initialized there because this information is not
+ available in the bitstream. */
+
+ /* open it */
+ if (avcodec_open2(c, codec, NULL) < 0) {
+ fprintf(stderr, "Could not open codec\n");
+ exit(1);
+ }
+
+ f = fopen(filename, "rb");
+ 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);
+ }
+
+ while (!feof(f)) {
+ /* read raw data from the input file */
+ data_size = fread(inbuf, 1, INBUF_SIZE, f);
+ if (!data_size)
+ break;
+
+ /* use the parser to split the data into frames */
+ data = inbuf;
+ while (data_size > 0) {
+ ret = av_parser_parse2(parser, c, &pkt->data, &pkt->size,
+ data, data_size, AV_NOPTS_VALUE, AV_NOPTS_VALUE, 0);
+ if (ret < 0) {
+ fprintf(stderr, "Error while parsing\n");
+ exit(1);
+ }
+ data += ret;
+ data_size -= ret;
+
+ if (pkt->size)
+ decode(c, frame, pkt, outfilename);
+ }
+ }
+
+ /* flush the decoder */
+ decode(c, frame, NULL, outfilename);
+
+ fclose(f);
+
+ av_parser_close(parser);
+ avcodec_free_context(&c);
+ av_frame_free(&frame);
+ av_packet_free(&pkt);
+
+ return 0;
+}
--
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