如何采用ffmpeg的API实现rtsp服务器的C程序代码,请给出代码实现
时间: 2024-03-05 21:48:56 浏览: 21
以下是一个简单的使用FFmpeg API实现RTSP服务器的C程序代码:
```c
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <time.h>
#include <unistd.h>
#include <pthread.h>
#include <signal.h>
#include <errno.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <libavutil/avutil.h>
#include <libavformat/avformat.h>
#include <libavcodec/avcodec.h>
#define RTSP_PORT 8554
#define MAX_CONNECTIONS 5
typedef struct {
AVFormatContext *fmt_ctx;
AVCodecContext *codec_ctx;
AVCodecParameters *codec_params;
int stream_index;
int client_socket;
struct sockaddr_in client_addr;
} rtsp_client_t;
rtsp_client_t clients[MAX_CONNECTIONS];
void *handle_client(void *arg) {
rtsp_client_t *client = (rtsp_client_t *) arg;
AVPacket packet;
av_init_packet(&packet);
while (1) {
if (av_read_frame(client->fmt_ctx, &packet) < 0) {
break;
}
if (packet.stream_index == client->stream_index) {
if (sendto(client->client_socket, packet.data, packet.size, 0,
(struct sockaddr *) &client->client_addr, sizeof(client->client_addr)) < 0) {
perror("sendto");
break;
}
}
av_packet_unref(&packet);
}
close(client->client_socket);
avformat_close_input(&client->fmt_ctx);
free(client);
return NULL;
}
void handle_sigint(int sig) {
for (int i = 0; i < MAX_CONNECTIONS; i++) {
if (clients[i].fmt_ctx != NULL) {
avformat_close_input(&clients[i].fmt_ctx);
}
if (clients[i].client_socket > 0) {
close(clients[i].client_socket);
}
}
exit(0);
}
int main() {
signal(SIGINT, handle_sigint);
AVFormatContext *fmt_ctx = NULL;
AVCodecContext *codec_ctx = NULL;
AVCodecParameters *codec_params = NULL;
AVCodec *codec = NULL;
int stream_index = -1;
if (avformat_open_input(&fmt_ctx, "rtsp://localhost:8554/test.sdp", NULL, NULL) < 0) {
perror("avformat_open_input");
return 1;
}
if (avformat_find_stream_info(fmt_ctx, NULL) < 0) {
perror("avformat_find_stream_info");
return 1;
}
for (int i = 0; i < fmt_ctx->nb_streams; i++) {
codec_params = fmt_ctx->streams[i]->codecpar;
codec = avcodec_find_decoder(codec_params->codec_id);
if (codec != NULL) {
stream_index = i;
break;
}
}
if (stream_index < 0) {
perror("no suitable codec found");
return 1;
}
codec_ctx = avcodec_alloc_context3(codec);
if (avcodec_parameters_to_context(codec_ctx, codec_params) < 0) {
perror("avcodec_parameters_to_context");
return 1;
}
if (avcodec_open2(codec_ctx, codec, NULL) < 0) {
perror("avcodec_open2");
return 1;
}
int server_socket = socket(AF_INET, SOCK_STREAM, 0);
if (server_socket < 0) {
perror("socket");
return 1;
}
struct sockaddr_in server_addr;
memset(&server_addr, 0, sizeof(server_addr));
server_addr.sin_family = AF_INET;
server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
server_addr.sin_port = htons(RTSP_PORT);
if (bind(server_socket, (struct sockaddr *) &server_addr, sizeof(server_addr)) < 0) {
perror("bind");
return 1;
}
if (listen(server_socket, MAX_CONNECTIONS) < 0) {
perror("listen");
return 1;
}
int client_socket;
struct sockaddr_in client_addr;
socklen_t client_addr_len = sizeof(client_addr);
pthread_t client_thread;
while (1) {
client_socket = accept(server_socket, (struct sockaddr *) &client_addr, &client_addr_len);
if (client_socket < 0) {
perror("accept");
continue;
}
int i;
for (i = 0; i < MAX_CONNECTIONS; i++) {
if (clients[i].fmt_ctx == NULL) {
break;
}
}
if (i == MAX_CONNECTIONS) {
close(client_socket);
continue;
}
clients[i].fmt_ctx = avformat_alloc_context();
if (avformat_open_input(&clients[i].fmt_ctx, "rtsp://localhost:8554/test.sdp", NULL, NULL) < 0) {
perror("avformat_open_input");
continue;
}
if (avformat_find_stream_info(clients[i].fmt_ctx, NULL) < 0) {
perror("avformat_find_stream_info");
continue;
}
for (int j = 0; j < clients[i].fmt_ctx->nb_streams; j++) {
AVCodecParameters *params = clients[i].fmt_ctx->streams[j]->codecpar;
if (params->codec_id == codec_params->codec_id) {
clients[i].codec_params = params;
clients[i].stream_index = j;
break;
}
}
if (clients[i].stream_index < 0) {
perror("no suitable codec found");
continue;
}
clients[i].client_socket = client_socket;
clients[i].client_addr = client_addr;
pthread_create(&client_thread, NULL, handle_client, &clients[i]);
}
return 0;
}
```
该程序使用FFmpeg API读取RTSP流,并将其发送到连接到RTSP服务器的客户端。每当有新客户端连接时,就会启动一个新线程来处理该客户端的请求。程序使用了一个简单的循环来处理多个客户端连接。在SIGINT信号处理程序中,程序会清理所有打开的FFmpeg上下文和套接字,然后退出。