myvtm/Other/win/libvideorecord/FFmpegWriter.cpp

#include "stdafx.h"

#include "FFmpegWriter.h"
#include <stdlib.h>
#include <stdio.h>
#include <string.h>
#include <math.h>


#define STREAM_DURATION   10.0
#define STREAM_FRAME_RATE 25 /* 25 images/s */
#define STREAM_PIX_FMT    AV_PIX_FMT_YUV420P /* default pix_fmt */

#define SCALE_FLAGS SWS_BICUBIC

// a wrapper around a single output AVStream
struct OutputStream_t {
    AVStream *st;
    AVCodecContext *enc;

    /* pts of the next frame that will be generated */
    int64_t next_pts;
    int samples_count;

    AVFrame *frame;
    AVFrame *tmp_frame;

    struct SwsContext *sws_ctx;
    struct SwrContext *swr_ctx;
};


char av_ts_string[AV_TS_MAX_STRING_SIZE] = { 0 };
#define av_ts2str(ts) av_ts_make_string(av_ts_string, ts)


char av_ts_buff[AV_TS_MAX_STRING_SIZE] = { 0 };
#define av_ts2timestr(ts, tb) av_ts_make_time_string(av_ts_buff, ts, tb)

static void log_packet(const AVFormatContext *fmt_ctx, const AVPacket *pkt, LogApi* pLogApi)
{
    AVRational *time_base = &fmt_ctx->streams[pkt->stream_index]->time_base;

    //pLogApi->Debug("pts:%s pts_time:%s dts:%s dts_time:%s duration:%s duration_time:%s stream_index:%d",
    //                av_ts2str(pkt->pts), av_ts2timestr(pkt->pts, time_base),
    //                av_ts2str(pkt->dts), av_ts2timestr(pkt->dts, time_base),
    //                av_ts2str(pkt->duration), av_ts2timestr(pkt->duration, time_base),
    //                pkt->stream_index);
}

static void log_callback(void* ptr, int level, const char* fmt, va_list vl)
{
 //   va_list vl2;
 //	  char line[1024] = {0};
 //   static int print_prefix = 1;

 //   va_copy(vl2, vl);
 //   av_log_default_callback(ptr, level, fmt, vl);
 //   av_log_format_line(ptr, level, fmt, vl2, line, sizeof(line), &print_prefix);
 //   va_end(vl2);

    AVClassCategory type = av_default_get_category(ptr);
    if (AV_CLASS_CATEGORY_ENCODER == type) {
        AVCodecContext* c = (AVCodecContext*)ptr;
        if (c != NULL) {
            LogApi* pLogApi = (LogApi*)c->opaque;
            if (pLogApi != NULL) {
               pLogApi->vDebug(fmt, vl);
            }
        }
    }
    //if (report_file_level >= level) {
    //    fputs(line, report_file);
    //    fflush(report_file);
    //}
}

static int write_frame(AVFormatContext *fmt_ctx, const AVRational *time_base, AVStream *st, AVPacket *pkt, LogApi* pLogApi)
{
    /* rescale output packet timestamp values from codec to stream timebase */
    av_packet_rescale_ts(pkt, *time_base, st->time_base);
    pkt->stream_index = st->index;

    /* Write the compressed frame to the media file. */
    log_packet(fmt_ctx, pkt, pLogApi);

    return av_interleaved_write_frame(fmt_ctx, pkt);
}

/* Add an output stream. */
static bool add_stream(LogApi* pLogApi, OutputStream *ost, AVFormatContext *oc,
                       AVCodec **codec,
                       enum AVCodecID codec_id,
                       int width, int height, int colorbit, int nfps,
                       int nSamplePsec, int nchannels)
{
    /* find the encoder */
    *codec = avcodec_find_encoder(codec_id);
    if (!(*codec)) {
        pLogApi->Debug("add_stream failed for Could not find encoder for %s", avcodec_get_name(codec_id));
        return false;
    }

    ost->st = avformat_new_stream(oc, NULL);
    if (!ost->st) {
        return false;
    }
    
    ost->st->id = oc->nb_streams-1;

    AVCodecContext* enc_ctx = avcodec_alloc_context3(*codec);
    if (!enc_ctx) {
        pLogApi->Debug("add_stream failed for Could not alloc an encoding context!");
        return false   ;
    }

    ost->enc = enc_ctx;

    switch ((*codec)->type) {
        case AVMEDIA_TYPE_AUDIO:
        {
            enc_ctx->sample_fmt  = (*codec)->sample_fmts ? (*codec)->sample_fmts[0] : AV_SAMPLE_FMT_FLTP;
            enc_ctx->sample_rate = nSamplePsec;
            if ((*codec)->supported_samplerates) {
                for (int i = 0; (*codec)->supported_samplerates[i]; i++) {
				    pLogApi->Debug("(*codec)->supported_samplerates[%d] = %d.", i, (*codec)->supported_samplerates[i]);
                }
            }
		    if (nchannels == 2){
                enc_ctx->channel_layout = AV_CH_LAYOUT_STEREO;
                enc_ctx->channels       = av_get_channel_layout_nb_channels(enc_ctx->channel_layout);
		    }
            else if (nchannels == 1){
                enc_ctx->channel_layout = AV_CH_LAYOUT_MONO;
                enc_ctx->channels       = av_get_channel_layout_nb_channels(enc_ctx->channel_layout);
		    }
        
            if ((*codec)->channel_layouts) {
                enc_ctx->channel_layout = (*codec)->channel_layouts[0];
                for (int i = 0; (*codec)->channel_layouts[i]; i++) {
                    if ((*codec)->channel_layouts[i] == AV_CH_LAYOUT_STEREO) {
                        enc_ctx->channel_layout = AV_CH_LAYOUT_STEREO;
                    }
                }
            }
            enc_ctx->channels = av_get_channel_layout_nb_channels(enc_ctx->channel_layout);
            AVRational tb = { 1, enc_ctx->sample_rate };
            ost->st->time_base = tb;
        }
        break;

        case AVMEDIA_TYPE_VIDEO:
        {
            enc_ctx->codec_id = codec_id;
            //c->bit_rate = 400000;
            /* Resolution must be a multiple of two. */
            enc_ctx->width = width;
            enc_ctx->height = height;
            /* timebase: This is the fundamental unit of time (in seconds) in terms
             * of which frame timestamps are represented. For fixed-fps content,
            * timebase should be 1/framerate and timestamp increments should be
            * identical to 1. */
            AVRational time_rb = { 1, nfps };
            //ost->st->time_base = time_rb;
            //AVRational nfps_rb = { nfps,  1 };
            //ost->st->avg_frame_rate = nfps_rb;
            //enc_ctx->framerate = nfps_rb;
            enc_ctx->time_base = time_rb;

            //c->gop_size      = 12; /* emit one intra frame every twelve frames at most */
            enc_ctx->pix_fmt = STREAM_PIX_FMT;

            if (enc_ctx->codec_id == AV_CODEC_ID_MPEG2VIDEO) {
                /* just for testing, we also add B-frames */
               enc_ctx->max_b_frames = 2;
            }
            if (enc_ctx->codec_id == AV_CODEC_ID_MPEG1VIDEO) {
                /* Needed to avoid using macroblocks in which some coeffs overflow.
                 * This does not happen with normal video, it just happens here as
                 * the motion of the chroma plane does not match the luma plane. */
                enc_ctx->mb_decision = 2;
            }
        }
        av_opt_set(enc_ctx->priv_data, "preset", "superfast", 0);
        av_opt_set(enc_ctx->priv_data, "tune", "zerolatency", 0);

        break;

        default:
            break;
    }

    /* Some formats want stream headers to be separate. */
    if (oc->oformat->flags & AVFMT_GLOBALHEADER) {
        enc_ctx->flags |= AV_CODEC_FLAG_GLOBAL_HEADER;
    }

    pLogApi->Debug("add_stream success get encoder for '%s'", avcodec_get_name(codec_id));

	return true;
}

/**************************************************************/
/* audio output */

static AVFrame *alloc_audio_frame(enum AVSampleFormat sample_fmt,
                                  uint64_t channel_layout,
                                  int sample_rate, int nb_samples)
{
    AVFrame *frame = av_frame_alloc();
    int ret = -1;

    if (!frame) {
        return NULL;
    }

    frame->format = sample_fmt;
    frame->channel_layout = channel_layout;
    frame->sample_rate = sample_rate;
    frame->nb_samples = nb_samples;

    if (nb_samples) {
        ret = av_frame_get_buffer(frame, 0);
        if (ret < 0) {
			av_frame_free(&frame);
            return NULL;
        }
    }

    return frame;
}


static bool open_audio(LogApi* pLogApi, AVFormatContext *oc, AVCodec *codec, OutputStream *ost, AVDictionary *opt_arg, enum AVSampleFormat in_sample_fmt)
{
    AVCodecContext *c = NULL;
    int nb_samples = 0;
    int ret = -1;
    AVDictionary *opt = NULL;

    c = ost->enc;
    c->opaque = pLogApi;

    /* open it */
    av_dict_copy(&opt, opt_arg, 0);
    ret = avcodec_open2(c, codec, &opt);
    av_dict_free(&opt);
    
    if (ret < 0) {
        pLogApi->Debug("open_audio failed for could not open audio codec: %s, ret: %d.", avcodec_get_name(codec->id), ret);
        return false;
    }

    if (c->codec->capabilities & AV_CODEC_CAP_VARIABLE_FRAME_SIZE) {
        nb_samples = 10000;
    }
    else {
        nb_samples = c->frame_size;
    }

    ost->frame = alloc_audio_frame(c->sample_fmt, c->channel_layout, c->sample_rate, nb_samples);
    ost->tmp_frame = alloc_audio_frame(in_sample_fmt, c->channel_layout, c->sample_rate, nb_samples);

    /* copy the stream parameters to the muxer */
    ret = avcodec_parameters_from_context(ost->st->codecpar, c);
    if (ret < 0) {
        pLogApi->Debug("open_audio failed for could not copy the stream parameters.");
        return false;
    }

    /* create resampler context */
    ost->swr_ctx = swr_alloc();
    if (!ost->swr_ctx) {
        pLogApi->Debug("open_audio failed for could not allocate resampler context.");
        return false;
    }

    /* set options */
    av_opt_set_int(ost->swr_ctx, "in_channel_count", c->channels, 0);
    av_opt_set_int(ost->swr_ctx, "in_sample_rate", c->sample_rate, 0);
    av_opt_set_sample_fmt(ost->swr_ctx, "in_sample_fmt", in_sample_fmt, 0);

    av_opt_set_int(ost->swr_ctx, "out_channel_count", c->channels, 0);
    av_opt_set_int(ost->swr_ctx, "out_sample_rate", c->sample_rate, 0);
    av_opt_set_sample_fmt(ost->swr_ctx, "out_sample_fmt", c->sample_fmt, 0);

    /* initialize the resampling context */
    if ((ret = swr_init(ost->swr_ctx)) < 0) {
        pLogApi->Debug("open_audio failed for failed to initialize the resampling context.");
        return false;
    }

    pLogApi->Debug("open_audio success encoder for %s, nb_samples:%d.", avcodec_get_name(codec->id), nb_samples);

	return true;
}

/* Prepare a 16 bit dummy audio frame of 'frame_size' samples and
 * 'nb_channels' channels. */
static AVFrame *get_audio_frame(OutputStream *ost, ByteBuffer* audio_input_buffer)
{
    AVFrame *frame = ost->tmp_frame;
    audio_input_buffer->getBytes(frame->data[0], av_samples_get_buffer_size(NULL, frame->channels,
        frame->nb_samples,
        (AVSampleFormat)frame->format, 0));

    frame->pts = ost->next_pts;
    ost->next_pts  += frame->nb_samples;

    return frame;
}

/*
 * encode one audio frame and send it to the muxer
 * return 1 when encoding is finished, 0 otherwise
 */
static int write_audio_frame(LogApi* pLogApi, AVFormatContext *oc, OutputStream *audio_ost, ByteBuffer* audio_input_buffer)
{
    AVCodecContext *enc_ctx = NULL;
    AVPacket pkt = { 0 }; // data and size must be 0;
    AVFrame *frame = NULL;
    int ret = -1;
    int got_packet = 0;
    int dst_nb_samples = 0;

    av_init_packet(&pkt);
    enc_ctx = audio_ost->enc;

    frame = get_audio_frame(audio_ost, audio_input_buffer);

    if (frame) {
        /* convert samples from native format to destination codec format, using the resampler */
            /* compute destination number of samples */
            dst_nb_samples = av_rescale_rnd(swr_get_delay(audio_ost->swr_ctx, enc_ctx->sample_rate) + frame->nb_samples,
                enc_ctx->sample_rate, enc_ctx->sample_rate, AV_ROUND_UP);
            av_assert0(dst_nb_samples == frame->nb_samples);

        /* when we pass a frame to the encoder, it may keep a reference to it
         * internally;
         * make sure we do not overwrite it here
         */
        ret = av_frame_make_writable(audio_ost->frame);
        if (ret < 0) {
            pLogApi->Debug("write_audio_frame failed for av_frame_make_writable: %d", ret);
            return -1;
        }

#ifdef RVC_OS_WIN
        //pLogApi->Debug("write_audio_frame nb_samples: %d, dst_nb_samples: %d, pts: %I64d", frame->nb_samples, dst_nb_samples, frame->pts);
#else
        //pLogApi->Debug("write_audio_frame nb_samples: %d, dst_nb_samples: %d, pts: %lld", frame->nb_samples, dst_nb_samples, frame->pts);
#endif

        /* convert to destination format */
        ret = swr_convert(audio_ost->swr_ctx,
            audio_ost->frame->data, dst_nb_samples,
                          (const uint8_t **)frame->data, frame->nb_samples);
        if (ret < 0) {
            pLogApi->Debug("write_audio_frame failed for Error while converting");
            return -1;
        }
        frame = audio_ost->frame;
        AVRational rb = { 1, enc_ctx->sample_rate };
        frame->pts = av_rescale_q(audio_ost->samples_count, rb, enc_ctx->time_base);
        audio_ost->samples_count += dst_nb_samples;

#ifdef RVC_OS_WIN
        //pLogApi->Debug("write_audio_frame new nb_samples: %d, pts: %I64d", frame->nb_samples, frame->pts);
#else
        //pLogApi->Debug("write_audio_frame new nb_samples: %d, pts: %lld", frame->nb_samples, frame->pts);
#endif
    }

    ret = avcodec_encode_audio2(enc_ctx, &pkt, frame, &got_packet);

    //ret = avcodec_send_frame(c, frame);
    //if (ret < 0) {
    //    pLogApi->Debug("ffmpeg_encoder_process Error sending the frame to the encoder");
    //}
    //else {
    //    got_packet = avcodec_receive_packet(c, &pkt);
    //    if (got_packet < 0) {
    //        pLogApi->Debug("avcodec_receive_packet failed.");
    //        return got_packet;
    //    }
    //}


    if (got_packet) {
        //pLogApi->Debug("write_audio_frame got_packet");
        ret = write_frame(oc, &enc_ctx->time_base, audio_ost->st, &pkt, pLogApi);
        if (ret < 0) {
            pLogApi->Debug("write_audio_frame failed for Error while writing audio frame: %d", ret);
            return -1;
        }
    }

    return (frame || got_packet) ? 0 : 1;
}

/**************************************************************/
/* video output */

static AVFrame *alloc_picture(enum AVPixelFormat pix_fmt, int width, int height)
{
    AVFrame *picture = NULL;
    int ret = -1;

    picture = av_frame_alloc();
    if (!picture) {
        return NULL;
    }

    picture->format = pix_fmt;
    picture->width  = width;
    picture->height = height;

    /* allocate the buffers for the frame data */
    ret = av_frame_get_buffer(picture, 32);
    if (ret < 0) {
		av_frame_free(&picture);
        return NULL;
    }

    return picture;
}

static bool open_video(LogApi* pLogApi, AVFormatContext *oc, AVCodec *codec, OutputStream *video_ost, AVDictionary *opt_arg, enum AVPixelFormat input_pix_fmt)
{
    int ret = -1;
    AVCodecContext *enc_ctx = video_ost->enc;
    AVDictionary *opt = NULL;

    av_dict_copy(&opt, opt_arg, 0);

    //huchen add for msmpeg4v3
    //av_dict_set(&opt, "lmin", "1180", 0);
    //av_dict_set(&opt, "lmax", "2360", 0);
    enc_ctx->bit_rate = 128*1000;
    //c->qmin = 16;
    //c->qmax = 30;
    //c->max_b_frames = 0;

    enc_ctx->opaque = pLogApi;
    /* open the codec */
    ret = avcodec_open2(enc_ctx, codec, &opt);
    av_dict_free(&opt);
    if (ret < 0) {
        pLogApi->Debug("open_video failed for Could not open video codec: %s, ret :%d", avcodec_get_name(codec->id), ret);
        return false;
    }

    /* allocate and init a re-usable frame */
    video_ost->frame = alloc_picture(enc_ctx->pix_fmt, enc_ctx->width, enc_ctx->height);
    if (!video_ost->frame) {
        pLogApi->Debug("open_video failed for Could not allocate video frame");
        return false;
    }

    /* If the output format is not input_pix_fmt, then a temporary input_pix_fmt
    * picture is needed too. It is then converted to the required
    * output format. */
    video_ost->tmp_frame = NULL;
    if (enc_ctx->pix_fmt != input_pix_fmt) {
        video_ost->tmp_frame = alloc_picture(input_pix_fmt, enc_ctx->width, enc_ctx->height);
        if (!video_ost->tmp_frame) {
            pLogApi->Debug("Could not allocate temporary picture");
            return false;
        }
    }

    /* copy the stream parameters to the muxer */
    ret = avcodec_parameters_from_context(video_ost->st->codecpar, enc_ctx);
    if (ret < 0) {
        pLogApi->Debug("open_video failed for Could not copy the stream parameters");
        return false;
    }

    pLogApi->Debug("open_video success encoder for %s.", avcodec_get_name(codec->id));
    pLogApi->Debug("open_video success encoder output_fmt: %s.", av_get_pix_fmt_name(enc_ctx->pix_fmt));
    pLogApi->Debug("open_video success encoder input_fmt: %s.", av_get_pix_fmt_name(input_pix_fmt));
    pLogApi->Debug("open_video success encoder, video enc_ctx time_base num: %d.", enc_ctx->time_base.num);
    pLogApi->Debug("open_video success encoder, video enc_ctx time_base den: %d.", enc_ctx->time_base.den);

	return true;
}

static AVFrame *get_video_frame(LogApi* pLogApi, OutputStream *video_ost, char *data, int len, AVPixelFormat input_pix_fmt)
{
    AVCodecContext *enc_ctx = video_ost->enc;

    /* when we pass a frame to the encoder, it may keep a reference to it
     * internally; make sure we do not overwrite it here */
    if (av_frame_make_writable(video_ost->frame) < 0) {
        return NULL;
    }
       
    if (enc_ctx->pix_fmt != input_pix_fmt) {
        /* we must convert it
         * to the codec pixel format if needed */
        if (!video_ost->sws_ctx) {
            video_ost->sws_ctx = sws_getContext(enc_ctx->width, enc_ctx->height,
                input_pix_fmt,
                enc_ctx->width,
                enc_ctx->height,
                enc_ctx->pix_fmt,
                SCALE_FLAGS, NULL, NULL, NULL);
            if (!video_ost->sws_ctx) {
                return NULL;
            }
        }
        //copy
        //因videoqueue中视频均为rgb24位格式，默认为24bpp
        for (int i = video_ost->tmp_frame->height -1, j = 0; i >= 0 && j < video_ost->tmp_frame->height; i--, j++){
            memcpy(video_ost->tmp_frame->data[0] + j * video_ost->tmp_frame->linesize[0],
                    data + i * video_ost->tmp_frame->width * 3, video_ost->tmp_frame->width * 3);
        }
        
        //convert
        sws_scale(video_ost->sws_ctx, (const uint8_t* const*)video_ost->tmp_frame->data,
            video_ost->tmp_frame->linesize, 0, enc_ctx->height, video_ost->frame->data,
            video_ost->frame->linesize);
    }
    else {
        //copy
        //因videoqueue中视频均为rgb24位格式，默认为24bpp
        for (int i = video_ost->tmp_frame->height - 1, j = 0; i >= 0 && j < video_ost->tmp_frame->height; i--, j++){
            memcpy(video_ost->tmp_frame->data[0] + j * video_ost->tmp_frame->linesize[0],
                    data + i * video_ost->tmp_frame->width * 3, video_ost->tmp_frame->width * 3);
        }
        
    }

    video_ost->frame->pts = video_ost->next_pts++;
    //video_ost->frame->key_frame = 1;

    return video_ost->frame;
}

/*
 * encode one video frame and send it to the muxer
 * return 1 when encoding is finished, 0 otherwise
 */
static int write_video_frame(LogApi* pLogApi, AVFormatContext *oc, OutputStream *ost, char *data, int len, AVPixelFormat input_pix_fmt)
{
    int ret = -1;
    AVCodecContext *enc_ctx = NULL;
    AVFrame *vframe = NULL;
    int got_packet = 0;
    AVPacket pkt = { 0 };

    enc_ctx = ost->enc;

    vframe = get_video_frame(pLogApi, ost, data, len, input_pix_fmt);

    //pLogApi->Debug("get_video_frame pts = %d", vframe->pts);

    av_init_packet(&pkt);

    /* encode the image */
    int iencoderet = avcodec_encode_video2(enc_ctx, &pkt, vframe, &got_packet);
    if (iencoderet < 0) {
        pLogApi->Debug("open_video failed for Error(%d) encoding video frame.", iencoderet);
        return -1;
    }
    else {
        //pLogApi->Debug("avcodec_encode_video2 success(%d) and got_packet ret = %d.", iencoderet, got_packet);
    }

    if (got_packet) {
        //pLogApi->Debug("write_video_frame got_packet");
        ret = write_frame(oc, &enc_ctx->time_base, ost->st, &pkt, pLogApi);
    } 
    else {
        ret = 0;
    }

    if (ret < 0) {
        pLogApi->Debug("open_video failed for Error while writing video frame: %d", ret);
        return -1;
    }

    return (vframe || got_packet) ? 0 : 1;
}


static void close_stream(AVFormatContext *oc, OutputStream *ost)
{
    avcodec_free_context(&ost->enc);
    av_frame_free(&ost->frame);
    av_frame_free(&ost->tmp_frame);
    sws_freeContext(ost->sws_ctx);
    swr_free(&ost->swr_ctx);
}

/**************************************************************/
/* media file output */

bool FFmpegWriter::InitWriter(char* filename, int width, int height, int colorbit, int nfps,
    int nSamplePsec, int nchannels, int nBitPerSample, int nmaxspacing, int nquality, int nOutBitRate, int iAudioType)
{
    int iret = -1;
    AVDictionary *opt = NULL;
	bool result = true;

	if (nBitPerSample != 8 && nBitPerSample != 16 && nBitPerSample != 32){
        m_pLogApi->Debug("Init FFmpegWriter Failed for BitPerSample = %d", nBitPerSample);
		return false;
	}
	if (nchannels != 1 && nchannels != 2){
        m_pLogApi->Debug("Init FFmpegWriter Failed for channels = %d", nchannels);
		return false;
	}
	if (colorbit != 24){
        m_pLogApi->Debug("Init FFmpegWriter Failed for colorbit = %d", colorbit);
		return false;
	}

    if (colorbit == 24){
        m_input_pix_fmt = AV_PIX_FMT_BGR24;
    } else {
        m_input_pix_fmt = STREAM_PIX_FMT;
    }
    /* allocate the output media context */
    avformat_alloc_output_context2(&m_formatctx, NULL, NULL, filename);
    if (!m_formatctx) {
        m_pLogApi->Debug("Init FFmpegWriter Failed for avformat_alloc_output_context2, filename = %s", filename);
        return false;
    }

    //av_log_set_level(AV_LOG_ERROR);
    //av_log_set_callback(log_callback);
    m_outfmt = m_formatctx->oformat;
	m_pLogApi->Debug("real output format name of '%s' is %s, long_name is %s, mime_type is %s, extensions is %s.", filename, m_outfmt->name, m_outfmt->long_name, m_outfmt->mime_type, m_outfmt->extensions);

    m_video_st = new OutputStream();
    m_audio_st = new OutputStream();

    /* Add the audio and video streams using the default format codecs
     * and initialize the codecs. */
    if (m_outfmt->video_codec != AV_CODEC_ID_NONE) {
        result = add_stream(m_pLogApi, m_video_st, m_formatctx, &m_video_codec, m_outfmt->video_codec, width, height, colorbit, nfps, nSamplePsec, nchannels);
		if (result == false){
			Close();
            m_pLogApi->Debug("Init FFmpegWriter Failed for add_stream, video_codec = %d", m_outfmt->video_codec);
			return result;
		}		
        m_bhave_video = true;
    }
    if (m_outfmt->audio_codec != AV_CODEC_ID_NONE) {
        result = add_stream(m_pLogApi, m_audio_st, m_formatctx, &m_audio_codec, m_outfmt->audio_codec, width, height, colorbit, nfps, nSamplePsec, nchannels);
		if (result == false){
			Close();
            m_pLogApi->Debug("Init FFmpegWriter Failed for add_stream, audio_codec = %d", m_outfmt->audio_codec);
			return result;
		}	
		m_bhave_audio = true;
    }

    /* Now that all the parameters are set, we can open the audio and
     * video codecs and allocate the necessary encode buffers. */
    if (m_bhave_video){
        result = open_video(m_pLogApi, m_formatctx, m_video_codec, m_video_st, opt, m_input_pix_fmt);
		if (result == false){
			Close();
            m_pLogApi->Debug("Init FFmpegWriter Failed for open_video, video_codec = %d", m_outfmt->video_codec);
			return result;
		}	
    }
    if (m_bhave_audio){
		if (nBitPerSample == 8){
			result = open_audio(m_pLogApi, m_formatctx, m_audio_codec, m_audio_st, opt, AV_SAMPLE_FMT_U8);
			if (result == false){
				Close();
                m_pLogApi->Debug("Init FFmpegWriter Failed for open_audio, AV_SAMPLE_FMT_U8");
				return result;
			}				
		}else if (nBitPerSample == 16){
			result = open_audio(m_pLogApi, m_formatctx, m_audio_codec, m_audio_st, opt, AV_SAMPLE_FMT_S16);
			if (result == false){
				Close();
                m_pLogApi->Debug("Init FFmpegWriter Failed for open_audio, AV_SAMPLE_FMT_S16");
				return result;
			}				
		}else if (nBitPerSample == 32) {
            result = open_audio(m_pLogApi, m_formatctx, m_audio_codec, m_audio_st, opt, AV_SAMPLE_FMT_FLT);
            if (result == false) {
                Close();
                m_pLogApi->Debug("Init FFmpegWriter Failed for open_audio, AV_SAMPLE_FMT_FLT");
                return result;
            }
        }
	}

    av_dump_format(m_formatctx, 0, filename, 1);

    /* open the output file, if needed */
    if (!(m_outfmt->flags & AVFMT_NOFILE)) {
        iret = avio_open(&m_formatctx->pb, filename, AVIO_FLAG_WRITE);
        if (iret < 0) {
			Close();
            m_pLogApi->Debug("Init FFmpegWriter Failed for avio_open, %s", filename);
            return false;
        }
    }

    m_audio_input_buffer = new ByteBuffer(3*nBitPerSample/8 * nchannels* nSamplePsec);
    m_pLogApi->Debug("Init FFmpegWriter success, audio_input_buffer:%d", 3 * nBitPerSample / 8 * nchannels * nSamplePsec);

    m_bstart = false;

    return result;
}



bool FFmpegWriter::StartWrite() 
{
	AVDictionary *opt = NULL;
    /* Write the stream header, if any. */ 
    int ret = avformat_write_header(m_formatctx, &opt);
    if (ret < 0) {
        m_pLogApi->Debug("StartWrite Failed when opening output file: %d", ret);
        return false;
    }

    m_pLogApi->Debug("FFmpegWriter StartWrite success");

    m_bstart = true;

	return true;
}


bool FFmpegWriter::StopWrite() {
    /* Write the trailer, if any. The trailer must be written before you
     * close the CodecContexts open when you wrote the header; otherwise
     * av_write_trailer() may try to use memory that was freed on
     * av_codec_close(). */
	if (m_formatctx == NULL){
        m_pLogApi->Debug("End Failed when oc is null");
		return false;
	}
	
    if (m_bstart) {
        av_write_trailer(m_formatctx);
    }
	
	Close();

    av_log_set_callback(NULL);

    m_bstart = false;

    m_pLogApi->Debug("FFmpegWriter End success");

	return true;
}

void FFmpegWriter::Close()
{
    /* Close each codec. */
    if (m_bhave_video) {
        close_stream(m_formatctx, m_video_st);
    }

    if (m_bhave_audio) {
        close_stream(m_formatctx, m_audio_st);
    }

    if (!(m_outfmt->flags & AVFMT_NOFILE)) {
        /* Close the output file. */
        avio_closep(&m_formatctx->pb);
    }

    /* free the stream */
    if (m_formatctx) {
        avformat_free_context(m_formatctx);
    }

    if (m_video_st != NULL) {
        delete m_video_st;
        m_video_st = NULL;
    }

    if (m_audio_st != NULL) {
        delete m_audio_st;
        m_audio_st = NULL;
    }

    if (m_audio_input_buffer != NULL) {
        delete m_audio_input_buffer;
        m_audio_input_buffer = NULL;
    }

    m_pLogApi->Debug("FFmpegWriter Close success");
}

bool FFmpegWriter::ReceiveAudioData(unsigned char* pData, unsigned long len) 
{
	if (m_formatctx == NULL || m_audio_st == NULL || !m_bhave_audio){
        m_pLogApi->Debug("ReceiveAudioData Failed when oc is null");
		return false;
	}
    //插入audio_input_buffer
    m_audio_input_buffer->putBytes(pData, len);
    
    AVFrame* frame = m_audio_st->tmp_frame;
    int frame_size = av_samples_get_buffer_size(NULL, frame->channels,
        frame->nb_samples,
        (AVSampleFormat)frame->format, 0);
    //m_pLogApi->Debug("ReceiveAudioData len:%d, available_data_len:%d, frame_size:%d", len, audio_input_buffer->bytesRemaining(), frame_size);
    //循环写帧
    while (frame_size <= m_audio_input_buffer->bytesRemaining()) {
        //m_pLogApi->Debug("ReceiveAudioData available_data_len:%d", audio_input_buffer->bytesRemaining());
        int result = write_audio_frame(m_pLogApi, m_formatctx, m_audio_st, m_audio_input_buffer);
        if (result < 0) {
            m_pLogApi->Debug("write_audio_frame Failed, %d", result);
            return false;
        }
    }
    //重设置audio_input_buffer，避免buffer过大
    uint8_t* tmp_buffer = new uint8_t[frame_size];
    int bytesRemaining = m_audio_input_buffer->bytesRemaining();
    m_audio_input_buffer->getBytes(tmp_buffer, bytesRemaining);
    m_audio_input_buffer->resize(bytesRemaining);
    m_audio_input_buffer->putBytes(tmp_buffer, bytesRemaining);
    delete tmp_buffer;

	return true;
}


bool FFmpegWriter::ReceiveVideoData(unsigned char* pData, unsigned long len) 
{
	if (m_formatctx == NULL || m_video_st == NULL || !m_bhave_video){
        m_pLogApi->Debug("ReceiveVideoData Failed when oc is null");
		return false;
	}

    //m_pLogApi->Debug("ReceiveVideoData len:%d", len);
    int result = write_video_frame(m_pLogApi, m_formatctx, m_video_st, (char*)pData, len, m_input_pix_fmt);
	if (result < 0){
        m_pLogApi->Debug("write_video_frame Failed, %d", result);
		return false;
	}
	return true;
}