最简单的基于FFmpeg的移动端例子:IOS 推流器
来源:互联网 发布:js 所有input不可编辑 编辑:程序博客网 时间:2024/06/07 05:26
源代码
项目的目录结构如图所示。
C代码位于ViewController.m文件中,内容如下所示。-
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- #import "ViewController.h"
- #include <libavformat/avformat.h>
- #include <libavutil/mathematics.h>
- #include <libavutil/time.h>
-
- @interface ViewController ()
-
- @end
-
- @implementation ViewController
-
- - (void)viewDidLoad {
- [super viewDidLoad];
-
- }
-
- - (void)didReceiveMemoryWarning {
- [super didReceiveMemoryWarning];
-
- }
-
- - (IBAction)clickStreamButton:(id)sender {
-
- char input_str_full[500]={0};
- char output_str_full[500]={0};
-
- NSString *input_str= [NSString stringWithFormat:@"resource.bundle/%@",self.input.text];
- NSString *input_nsstr=[[[NSBundle mainBundle]resourcePath] stringByAppendingPathComponent:input_str];
-
- sprintf(input_str_full,"%s",[input_nsstr UTF8String]);
- sprintf(output_str_full,"%s",[self.output.text UTF8String]);
-
- printf("Input Path:%s\n",input_str_full);
- printf("Output Path:%s\n",output_str_full);
-
- AVOutputFormat *ofmt = NULL;
-
- AVFormatContext *ifmt_ctx = NULL, *ofmt_ctx = NULL;
- AVPacket pkt;
- char in_filename[500]={0};
- char out_filename[500]={0};
- int ret, i;
- int videoindex=-1;
- int frame_index=0;
- int64_t start_time=0;
-
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- strcpy(in_filename,input_str_full);
- strcpy(out_filename,output_str_full);
-
- av_register_all();
-
- avformat_network_init();
-
- if ((ret = avformat_open_input(&ifmt_ctx, in_filename, 0, 0)) < 0) {
- printf( "Could not open input file.");
- goto end;
- }
- if ((ret = avformat_find_stream_info(ifmt_ctx, 0)) < 0) {
- printf( "Failed to retrieve input stream information");
- goto end;
- }
-
- for(i=0; i<ifmt_ctx->nb_streams; i++)
- if(ifmt_ctx->streams[i]->codec->codec_type==AVMEDIA_TYPE_VIDEO){
- videoindex=i;
- break;
- }
-
- av_dump_format(ifmt_ctx, 0, in_filename, 0);
-
-
-
- avformat_alloc_output_context2(&ofmt_ctx, NULL, "flv", out_filename);
-
-
- if (!ofmt_ctx) {
- printf( "Could not create output context\n");
- ret = AVERROR_UNKNOWN;
- goto end;
- }
- ofmt = ofmt_ctx->oformat;
- for (i = 0; i < ifmt_ctx->nb_streams; i++) {
-
- AVStream *in_stream = ifmt_ctx->streams[i];
- AVStream *out_stream = avformat_new_stream(ofmt_ctx, in_stream->codec->codec);
- if (!out_stream) {
- printf( "Failed allocating output stream\n");
- ret = AVERROR_UNKNOWN;
- goto end;
- }
-
- ret = avcodec_copy_context(out_stream->codec, in_stream->codec);
- if (ret < 0) {
- printf( "Failed to copy context from input to output stream codec context\n");
- goto end;
- }
- out_stream->codec->codec_tag = 0;
- if (ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER)
- out_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
- }
-
- av_dump_format(ofmt_ctx, 0, out_filename, 1);
-
- if (!(ofmt->flags & AVFMT_NOFILE)) {
- ret = avio_open(&ofmt_ctx->pb, out_filename, AVIO_FLAG_WRITE);
- if (ret < 0) {
- printf( "Could not open output URL '%s'", out_filename);
- goto end;
- }
- }
-
- ret = avformat_write_header(ofmt_ctx, NULL);
- if (ret < 0) {
- printf( "Error occurred when opening output URL\n");
- goto end;
- }
-
- start_time=av_gettime();
- while (1) {
- AVStream *in_stream, *out_stream;
-
- ret = av_read_frame(ifmt_ctx, &pkt);
- if (ret < 0)
- break;
-
-
- if(pkt.pts==AV_NOPTS_VALUE){
-
- AVRational time_base1=ifmt_ctx->streams[videoindex]->time_base;
-
- int64_t calc_duration=(double)AV_TIME_BASE/av_q2d(ifmt_ctx->streams[videoindex]->r_frame_rate);
-
- pkt.pts=(double)(frame_index*calc_duration)/(double)(av_q2d(time_base1)*AV_TIME_BASE);
- pkt.dts=pkt.pts;
- pkt.duration=(double)calc_duration/(double)(av_q2d(time_base1)*AV_TIME_BASE);
- }
-
- if(pkt.stream_index==videoindex){
- AVRational time_base=ifmt_ctx->streams[videoindex]->time_base;
- AVRational time_base_q={1,AV_TIME_BASE};
- int64_t pts_time = av_rescale_q(pkt.dts, time_base, time_base_q);
- int64_t now_time = av_gettime() - start_time;
- if (pts_time > now_time)
- av_usleep(pts_time - now_time);
-
- }
-
- in_stream = ifmt_ctx->streams[pkt.stream_index];
- out_stream = ofmt_ctx->streams[pkt.stream_index];
-
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- pkt.pts = av_rescale_q_rnd(pkt.pts, in_stream->time_base, out_stream->time_base, (AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
- pkt.dts = av_rescale_q_rnd(pkt.dts, in_stream->time_base, out_stream->time_base, (AV_ROUND_NEAR_INF|AV_ROUND_PASS_MINMAX));
- pkt.duration = av_rescale_q(pkt.duration, in_stream->time_base, out_stream->time_base);
- pkt.pos = -1;
-
- if(pkt.stream_index==videoindex){
- printf("Send %8d video frames to output URL\n",frame_index);
- frame_index++;
- }
-
- ret = av_interleaved_write_frame(ofmt_ctx, &pkt);
-
- if (ret < 0) {
- printf( "Error muxing packet\n");
- break;
- }
-
- av_free_packet(&pkt);
-
- }
-
- av_write_trailer(ofmt_ctx);
- end:
- avformat_close_input(&ifmt_ctx);
-
- if (ofmt_ctx && !(ofmt->flags & AVFMT_NOFILE))
- avio_close(ofmt_ctx->pb);
- avformat_free_context(ofmt_ctx);
- if (ret < 0 && ret != AVERROR_EOF) {
- printf( "Error occurred.\n");
- return;
- }
- return;
-
- }
- @end
运行结果
App在手机上运行后的结果如下图所示。单击“Stream”,将会把位于resource.bundle中的“war3end.mp4”文件推送到“rtmp://www.velab.com.cn/live/test”的URL上。
使用视频播放器(在这里使用ffplay)可以查看推送的实时流,如下图所示。
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