avcodec_encode_video2()分析

1. int attribute_align_arg avcodec_encode_video2(AVCodecContext *avctx,  
2.                                               AVPacket *avpkt,  
3.                                               const AVFrame *frame,  

1.                                               int *got_packet_ptr)  

{

}

X264_frame(AVCodecContext *ctx, AVPacket *pkt, const AVFrame *frame, int *got_packet)

{

 do {
        if (x264_encoder_encode(x4->enc, &nal, &nnal, frame? &x4->pic: NULL, &pic_out) < 0)
            return AVERROR_EXTERNAL;


        ret = encode_nals(ctx, pkt, nal, nnal);
        if (ret < 0)
            return ret;
    } while (!ret && !frame && x264_encoder_delayed_frames(x4->enc));

}

static int encode_nals(AVCodecContext *ctx, AVPacket *pkt,
                       const x264_nal_t *nals, int nnal)
{
    X264Context *x4 = ctx->priv_data;
    uint8_t *p;
    int i, size = x4->sei_size, ret;


    if (!nnal)
        return 0;


    for (i = 0; i < nnal; i++)
        size += nals[i].i_payload;


    if ((ret = ff_alloc_packet2(ctx, pkt, size, 0)) < 0)
        return ret;


    p = pkt->data;


    /* Write the SEI as part of the first frame. */
    if (x4->sei_size > 0 && nnal > 0) {
        if (x4->sei_size > size) {
            av_log(ctx, AV_LOG_ERROR, "Error: nal buffer is too small\n");
            return -1;
        }
        memcpy(p, x4->sei, x4->sei_size);
        p += x4->sei_size;
        x4->sei_size = 0;
        av_freep(&x4->sei);
    }


    for (i = 0; i < nnal; i++){
        memcpy(p, nals[i].p_payload, nals[i].i_payload);
        p += nals[i].i_payload;
    }


    return 1;
}