最简单的基于FFmpeg的移动端样例：IOS 推流器

/**

 * 最简单的基于FFmpeg的推流器-IOS

 * Simplest FFmpeg IOS Streamer

 *

 * 雷霄骅 Lei Xiaohua

 * leixiaohua1020@126.com

 * 中国传媒大学/数字电视技术

 * Communication University of China / Digital TV Technology

 * http://blog.csdn.net/leixiaohua1020

 *

 * 本程序是IOS平台下的推流器。它能够将本地文件以流媒体的形式推送出去。

 *

 * This software is the simplest streamer in IOS.

 * It can stream local media files to streaming media server.

 */

#import "ViewController.h"

#include <libavformat/avformat.h>

#include <libavutil/mathematics.h>

#include <libavutil/time.h>

@interface ViewController ()

@end

@implementation ViewController

- (void)viewDidLoad {

    [super viewDidLoad];

    // Do any additional setup after loading the view, typically from a nib.

}

- (void)didReceiveMemoryWarning {

    [super didReceiveMemoryWarning];

    // Dispose of any resources that can be recreated.

}

- (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;

    //Input AVFormatContext and Output AVFormatContext

    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;

    //in_filename  = "cuc_ieschool.mov";

    //in_filename  = "cuc_ieschool.h264";

    //in_filename  = "cuc_ieschool.flv";//Input file URL

    //out_filename = "rtmp://localhost/publishlive/livestream";//Output URL[RTMP]

    //out_filename = "rtp://233.233.233.233:6666";//Output URL[UDP]

    strcpy(in_filename,input_str_full);

    strcpy(out_filename,output_str_full);

    av_register_all();

    //Network

    avformat_network_init();

    //Input

    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);

    //Output

    avformat_alloc_output_context2(&ofmt_ctx, NULL, "flv", out_filename); //RTMP

    //avformat_alloc_output_context2(&ofmt_ctx, NULL, "mpegts", out_filename);//UDP

    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;

    }

    //Dump Format------------------

    av_dump_format(ofmt_ctx, 0, out_filename, 1);

    //Open output URL

    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;

        //Get an AVPacket

        ret = av_read_frame(ifmt_ctx, &pkt);

        if (ret < 0)

            break;

        //FIX：No PTS (Example: Raw H.264)

        //Simple Write PTS

        if(pkt.pts==AV_NOPTS_VALUE){

            //Write PTS

            AVRational time_base1=ifmt_ctx->streams[videoindex]->time_base;

            //Duration between 2 frames (us)

            int64_t calc_duration=(double)AV_TIME_BASE/av_q2d(ifmt_ctx->streams[videoindex]->r_frame_rate);

            //Parameters

            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);

        }

        //Important:Delay

        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];

        /* copy packet */

        //Convert PTS/DTS

        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;

        //Print to Screen

        if(pkt.stream_index==videoindex){

            printf("Send %8d video frames to output URL\n",frame_index);

            frame_index++;

        }

        //ret = av_write_frame(ofmt_ctx, &pkt);

        ret = av_interleaved_write_frame(ofmt_ctx, &pkt);

        if (ret < 0) {

            printf( "Error muxing packet\n");

            break;

        }

        av_free_packet(&pkt);

    }

    //写文件尾（Write file trailer）

    av_write_trailer(ofmt_ctx);

end:

    avformat_close_input(&ifmt_ctx);

    /* close output */

    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

执行结果

App在手机上执行后的结果例如以下图所看到的。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。

最简单的基于FFmpeg的移动端样例：IOS 推流器-LMLPHP

使用视频播放器（在这里使用ffplay）能够查看推送的实时流，例如以下图所看到的。

最简单的基于FFmpeg的移动端样例：IOS 推流器-LMLPHP

下载

simplest ffmpeg mobile

项目主页

Github：https://github.com/leixiaohua1020/simplest_ffmpeg_mobile

开源中国：https://git.oschina.net/leixiaohua1020/simplest_ffmpeg_mobile

SourceForge：https://sourceforge.net/projects/simplestffmpegmobile/

CSDN工程下载地址：http://download.csdn.net/detail/leixiaohua1020/8924391

本解决方式包括了使用FFmpeg在移动端处理多媒体的各种样例：