Function encode_frame

libavcodec/ffv1.c:753–812

#if CONFIG_FFV1_ENCODER
static int encode_frame(AVCodecContext *avctx, unsigned char *buf, int buf_size, void *data){
    FFV1Context *f = avctx->priv_data;
    RangeCoder * const c= &f->c;
    AVFrame *pict = data;
    const int width= f->width;
    const int height= f->height;
    AVFrame * const p= &f->picture;
    int used_count= 0;
    uint8_t keystate=128;

    ff_init_range_encoder(c, buf, buf_size);
    ff_build_rac_states(c, 0.05*(1LL<<32), 256-8);

    *p = *pict;
    p->pict_type= FF_I_TYPE;

    if(avctx->gop_size==0 || f->picture_number % avctx->gop_size == 0){
        put_rac(c, &keystate, 1);
        p->key_frame= 1;
        write_header(f);
        clear_state(f);
    }else{
        put_rac(c, &keystate, 0);
        p->key_frame= 0;
    }

    if(!f->ac){
        used_count += ff_rac_terminate(c);
//printf("pos=%d\n", used_count);
        init_put_bits(&f->pb, buf + used_count, buf_size - used_count);
    }else if (f->ac>1){
        int i;
        for(i=1; i<256; i++){
            c->one_state[i]= f->state_transition[i];
            c->zero_state[256-i]= 256-c->one_state[i];
        }
    }

    if(f->colorspace==0){
        const int chroma_width = -((-width )>>f->chroma_h_shift);
        const int chroma_height= -((-height)>>f->chroma_v_shift);

        encode_plane(f, p->data[0], width, height, p->linesize[0], 0);

        encode_plane(f, p->data[1], chroma_width, chroma_height, p->linesize[1], 1);
        encode_plane(f, p->data[2], chroma_width, chroma_height, p->linesize[2], 1);
    }else{
        encode_rgb_frame(f, (uint32_t*)(p->data[0]), width, height, p->linesize[0]/4);
    }
    emms_c();

    f->picture_number++;

    if(f->ac){
        return ff_rac_terminate(c);
    }else{
        flush_put_bits(&f->pb); //nicer padding FIXME
        return used_count + (put_bits_count(&f->pb)+7)/8;