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/avio_reading.c | 133 ++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 133 insertions(+), 0 deletions(-)
diff --git a/module/VideoPlayer/lib/linux/ffmpeg/share/ffmpeg/examples/avio_reading.c b/module/VideoPlayer/lib/linux/ffmpeg/share/ffmpeg/examples/avio_reading.c
new file mode 100644
index 0000000..cbfeb17
--- /dev/null
+++ b/module/VideoPlayer/lib/linux/ffmpeg/share/ffmpeg/examples/avio_reading.c
@@ -0,0 +1,133 @@
+/*
+ * Copyright (c) 2014 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
+ * libavformat AVIOContext API example.
+ *
+ * Make libavformat demuxer access media content through a custom
+ * AVIOContext read callback.
+ * @example avio_reading.c
+ */
+
+#include <libavcodec/avcodec.h>
+#include <libavformat/avformat.h>
+#include <libavformat/avio.h>
+#include <libavutil/file.h>
+
+struct buffer_data {
+ uint8_t *ptr;
+ size_t size; ///< size left in the buffer
+};
+
+static int read_packet(void *opaque, uint8_t *buf, int buf_size)
+{
+ struct buffer_data *bd = (struct buffer_data *)opaque;
+ buf_size = FFMIN(buf_size, bd->size);
+
+ if (!buf_size)
+ return AVERROR_EOF;
+ printf("ptr:%p size:%zu\n", bd->ptr, bd->size);
+
+ /* copy internal buffer data to buf */
+ memcpy(buf, bd->ptr, buf_size);
+ bd->ptr += buf_size;
+ bd->size -= buf_size;
+
+ return buf_size;
+}
+
+int main(int argc, char *argv[])
+{
+ AVFormatContext *fmt_ctx = NULL;
+ AVIOContext *avio_ctx = NULL;
+ uint8_t *buffer = NULL, *avio_ctx_buffer = NULL;
+ size_t buffer_size, avio_ctx_buffer_size = 4096;
+ char *input_filename = NULL;
+ int ret = 0;
+ struct buffer_data bd = { 0 };
+
+ if (argc != 2) {
+ fprintf(stderr, "usage: %s input_file\n"
+ "API example program to show how to read from a custom buffer "
+ "accessed through AVIOContext.\n", argv[0]);
+ return 1;
+ }
+ input_filename = argv[1];
+
+ /* slurp file content into buffer */
+ ret = av_file_map(input_filename, &buffer, &buffer_size, 0, NULL);
+ if (ret < 0)
+ goto end;
+
+ /* fill opaque structure used by the AVIOContext read callback */
+ bd.ptr = buffer;
+ bd.size = buffer_size;
+
+ if (!(fmt_ctx = avformat_alloc_context())) {
+ ret = AVERROR(ENOMEM);
+ goto end;
+ }
+
+ avio_ctx_buffer = av_malloc(avio_ctx_buffer_size);
+ if (!avio_ctx_buffer) {
+ ret = AVERROR(ENOMEM);
+ goto end;
+ }
+ avio_ctx = avio_alloc_context(avio_ctx_buffer, avio_ctx_buffer_size,
+ 0, &bd, &read_packet, NULL, NULL);
+ if (!avio_ctx) {
+ ret = AVERROR(ENOMEM);
+ goto end;
+ }
+ fmt_ctx->pb = avio_ctx;
+
+ ret = avformat_open_input(&fmt_ctx, NULL, NULL, NULL);
+ if (ret < 0) {
+ fprintf(stderr, "Could not open input\n");
+ goto end;
+ }
+
+ ret = avformat_find_stream_info(fmt_ctx, NULL);
+ if (ret < 0) {
+ fprintf(stderr, "Could not find stream information\n");
+ goto end;
+ }
+
+ av_dump_format(fmt_ctx, 0, input_filename, 0);
+
+end:
+ avformat_close_input(&fmt_ctx);
+ /* note: the internal buffer could have changed, and be != avio_ctx_buffer */
+ if (avio_ctx) {
+ av_freep(&avio_ctx->buffer);
+ av_freep(&avio_ctx);
+ }
+ av_file_unmap(buffer, buffer_size);
+
+ if (ret < 0) {
+ fprintf(stderr, "Error occurred: %s\n", av_err2str(ret));
+ return 1;
+ }
+
+ return 0;
+}
--
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