iOS ijkPlayer 改造——增加直播录像功能

参考：//www.greatytc.com/p/a346f93ddaff
本人懒从OC方法倒着复制的建议倒着看

IJKMediaPlayback.h

- (void)stopRecord;
- (void)startRecordWithFileName:(NSString *)fileName;

IJKFFMoviePlayerController.m

- (void)stopRecord {
    ijkmp_stop_recording(_mediaPlayer);
}

- (void)startRecordWithFileName:(NSString *)fileName {
    // 视频存储的路径
    const char *path = [fileName cStringUsingEncoding:NSUTF8StringEncoding];
    ijkmp_start_recording (_mediaPlayer, path);
}

- (BOOL)isRecording {
    return ijkmp_isRecording(_mediaPlayer);
}

ff_ffplay_def.h

/* ffplayer */
struct IjkMediaMeta;
struct IJKFF_Pipeline;
typedef struct FFPlayer {
    ...
    
    AVFormatContext *m_ofmt_ctx;        // 用于输出的AVFormatContext结构体
    AVOutputFormat *m_ofmt;
    pthread_mutex_t record_mutex;       // 锁
    int is_record;                      // 是否在录制
    int record_error;
    
    int is_first;                       // 第一帧数据
    int64_t start_v_pts;                // 开始录制时pts 视频
    int64_t start_v_dts;                // 开始录制时dts 视频
    int64_t start_a_pts;                // 开始录制时pts 音频
    int64_t start_a_dts;                // 开始录制时dts 音频
    
} FFPlayer;

ijkplayer.c

static int ijkmp_start_recording_l(IjkMediaPlayer *mp,const char *filePath)
{
//  av_log(mp->ffplayer,AV_LOG_WARING,"cjz ijkmp_start_recording_l filePath %s",filePath);
  return ffp_start_recording_l(mp->ffplayer,filePath);
}

int ijkmp_start_recording(IjkMediaPlayer *mp,const char *filePath)
{
  assert(mp);
  pthread_mutex_lock(&mp->mutex);
  av_log(mp->ffplayer,AV_LOG_WARNING,"cjz ijkmp_start_recording");
  int retval = ijkmp_start_recording_l(mp,filePath);
  pthread_mutex_unlock(&mp->mutex);
  return retval;
}

static int ijkmp_stop_recording_l(IjkMediaPlayer *mp)
{
  return ffp_stop_recording_l(mp->ffplayer);
} 

int ijkmp_stop_recording(IjkMediaPlayer *mp)
{
  assert(mp);
  pthread_mutex_lock(&mp->mutex);
  av_log(mp->ffplayer,AV_LOG_WARNING,"cjz ijkmp_stop_recording");
  int retval = ijkmp_stop_recording_l(mp);
  pthread_mutex_unlock(&mp->mutex);
  return retval;
}

static int ijkmp_isRecordFinished_l(IjkMediaPlayer *mp)
{
 return ffp_record_isfinished_l(mp->ffplayer);
}

int ijkmp_isRecordFinished(IjkMediaPlayer *mp)
{
  assert(mp);
 pthread_mutex_lock(&mp->mutex);
 av_log(mp->ffplayer,AV_LOG_WARNING,"cjz ijkmp_isRecordFinished ");
 int retval = ijkmp_isRecordFinished_l(mp);
 pthread_mutex_unlock(&mp->mutex);
 return retval;
}

int ijkmp_isRecording(IjkMediaPlayer *mp) {
    return mp->ffplayer->is_record;
}

ff_ffplay.h

int ffp_start_recording_l(FFPlayer *ffp,const char *file_name);
int ffp_record_isfinished_l(FFPlayer *ffp);
int ffp_stop_recording_l(FFPlayer *ffp);

ff_ffplay.c

//插入录制方法
int ffp_start_recording_l(FFPlayer *ffp,const char *file_name)
{
    assert(ffp);
    VideoState *is = ffp->is;
    
    ffp->m_ofmt_ctx = NULL;
    ffp->m_ofmt = NULL;
    ffp->is_record = 0;
    ffp->record_error = 0;
    
    if (!file_name || !strlen(file_name)) { // 没有路径
        av_log(ffp, AV_LOG_ERROR, "filename is invalid");
        goto end;
    }
    
    if (!is || !is->ic|| is->paused || is->abort_request) { // 没有上下文，或者上下文已经停止
        av_log(ffp, AV_LOG_ERROR, "is,is->ic,is->paused is invalid");
        goto end;
    }
    
    if (ffp->is_record) { // 已经在录制
        av_log(ffp, AV_LOG_ERROR, "recording has started");
        goto end;
    }
    
    // 初始化一个用于输出的AVFormatContext结构体
    avformat_alloc_output_context2(&ffp->m_ofmt_ctx, NULL, NULL, file_name);
    if (!ffp->m_ofmt_ctx) {
        av_log(ffp, AV_LOG_ERROR, "Could not create output context filename is %s\n", file_name);
        goto end;
    }
    ffp->m_ofmt = ffp->m_ofmt_ctx->oformat;
    
    for (int i = 0; i < is->ic->nb_streams; i++) {
        // 对照输入流创建输出流通道
        AVStream *in_stream = is->ic->streams[i];
        AVStream *out_stream = avformat_new_stream(ffp->m_ofmt_ctx, in_stream->codec->codec);
        if (!out_stream) {
            av_log(ffp, AV_LOG_ERROR, "Failed allocating output stream\n");
            goto end;
        }
        
        // 将输入视频/音频的参数拷贝至输出视频/音频的AVCodecContext结构体
        av_log(ffp, AV_LOG_DEBUG, "in_stream->codec；%p\n", in_stream->codec);
        if (avcodec_copy_context(out_stream->codec, in_stream->codec) < 0) {
            av_log(ffp, AV_LOG_ERROR, "Failed to copy context from input to output stream codec context\n");
            goto end;
        }
        
        out_stream->codec->codec_tag = 0;
        if (ffp->m_ofmt_ctx->oformat->flags & AVFMT_GLOBALHEADER) {
            out_stream->codec->flags |= CODEC_FLAG_GLOBAL_HEADER;
        }
    }
    
    av_dump_format(ffp->m_ofmt_ctx, 0, file_name, 1);
    
    // 打开输出文件
    if (!(ffp->m_ofmt->flags & AVFMT_NOFILE)) {
        if (avio_open(&ffp->m_ofmt_ctx->pb, file_name, AVIO_FLAG_WRITE) < 0) {
            av_log(ffp, AV_LOG_ERROR, "Could not open output file '%s'", file_name);
            goto end;
        }
    }
    
    // 写视频文件头
    if (avformat_write_header(ffp->m_ofmt_ctx, NULL) < 0) {
        av_log(ffp, AV_LOG_ERROR, "Error occurred when opening output file\n");
        goto end;
    }
    
    ffp->is_record = 1;
    ffp->record_error = 0;
    pthread_mutex_init(&ffp->record_mutex, NULL);
    
    return 0;
end:
    ffp->record_error = 1;
    return -1;
}

int ffp_record_isfinished_l(FFPlayer *ffp)
{
    return 0;
}

int ffp_record_file(FFPlayer *ffp, AVPacket *packet)
{
    assert(ffp);
    VideoState *is = ffp->is;
    int ret = 0;
    AVStream *in_stream;
    AVStream *out_stream;
    
    if (ffp->is_record) {
        if (packet == NULL) {
            ffp->record_error = 1;
            av_log(ffp, AV_LOG_ERROR, "packet == NULL");
            return -1;
        }
        
        AVPacket *pkt = (AVPacket *)av_malloc(sizeof(AVPacket)); // 与看直播的 AVPacket分开，不然卡屏
        av_new_packet(pkt, 0);
        if (0 == av_packet_ref(pkt, packet)) {
            pthread_mutex_lock(&ffp->record_mutex);
            if (!ffp->is_first) { // 录制的第一帧，时间从0开始
                ffp->is_first = 1;
                pkt->pts = 0;
                pkt->dts = 0;
            } else { // 之后的每一帧都要减去，点击开始录制时的值，这样的时间才是正确的
                if (pkt->stream_index == AVMEDIA_TYPE_AUDIO) {
                    pkt->pts = llabs(pkt->pts - ffp->start_a_pts);
                    pkt->dts = llabs(pkt->dts - ffp->start_a_dts);
                }
                else if (pkt->stream_index == AVMEDIA_TYPE_VIDEO) {
                    pkt->pts = pkt->dts = llabs(pkt->dts - ffp->start_v_dts);
                }
            }
            
            in_stream  = is->ic->streams[pkt->stream_index];
            out_stream = ffp->m_ofmt_ctx->streams[pkt->stream_index];
            
            // 转换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;
            
            // 写入一个AVPacket到输出文件
            if ((ret = av_interleaved_write_frame(ffp->m_ofmt_ctx, pkt)) < 0) {
                av_log(ffp, AV_LOG_ERROR, "Error muxing packet\n");
            }
            
            av_packet_unref(pkt);
            pthread_mutex_unlock(&ffp->record_mutex);
        } else {
            av_log(ffp, AV_LOG_ERROR, "av_packet_ref == NULL");
        }
    }
    return ret;
}


int ffp_stop_recording_l(FFPlayer *ffp){
    assert(ffp);
    if (ffp->is_record) {
        ffp->is_record = 0;
        pthread_mutex_lock(&ffp->record_mutex);
        if (ffp->m_ofmt_ctx != NULL) {
            av_write_trailer(ffp->m_ofmt_ctx);
            if (ffp->m_ofmt_ctx && !(ffp->m_ofmt->flags & AVFMT_NOFILE)) {
                avio_close(ffp->m_ofmt_ctx->pb);
            }
            avformat_free_context(ffp->m_ofmt_ctx);
            ffp->m_ofmt_ctx = NULL;
            ffp->is_first = 0;
        }
        pthread_mutex_unlock(&ffp->record_mutex);
        pthread_mutex_destroy(&ffp->record_mutex);
        av_log(ffp, AV_LOG_DEBUG, "stopRecord ok\n");
    } else {
        av_log(ffp, AV_LOG_ERROR, "don't need stopRecord\n");
    }
    return 0;
}

// ff_ffplay.c 自带方法
static int read_thread(void *arg) {
    ...
    for (;;) {
        //插入
        if (!ffp->is_first && pkt->pts == pkt->dts) { // 获取开始录制前dts等于pts最后的值，用于
            if (pkt->stream_index == AVMEDIA_TYPE_AUDIO) {
                ffp->start_a_pts = pkt->pts;
                ffp->start_a_dts = pkt->dts;
            }
        }
        if (pkt->stream_index == AVMEDIA_TYPE_VIDEO) {
            if (!ffp->is_first) {
                ffp->start_v_pts = pkt->pts;
                ffp->start_v_dts = pkt->dts;
                //                        printf("set start video start_pts: %lld +++++ start_dts: %lld\n", ffp->start_v_pts, ffp->start_v_dts);
            }
        }
        if (pkt->stream_index == AVMEDIA_TYPE_VIDEO) {
            //                    printf("video pts: %lld +++++ dts: %lld\n", pkt->pts, pkt->dts);
        }
#pragma  mark - 录制插入
        if (ffp->is_record) { // 可以录制时，写入文件
            if (0 != ffp_record_file(ffp, pkt)) {
                ffp->record_error = 1;
                ffp_stop_recording_l(ffp);
            }
        }
        ...
      }
    ...
}

iOS ijkPlayer 改造——增加直播录像功能

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