Function slice_decode_thread

libavcodec/mpeg12.c:1886–1920

}

static int slice_decode_thread(AVCodecContext *c, void *arg){
    MpegEncContext *s= *(void**)arg;
    const uint8_t *buf= s->gb.buffer;
    int mb_y= s->start_mb_y;
    const int field_pic= s->picture_structure != PICT_FRAME;

    s->error_count= (3*(s->end_mb_y - s->start_mb_y)*s->mb_width) >> field_pic;

    for(;;){
        uint32_t start_code;
        int ret;

        ret= mpeg_decode_slice((Mpeg1Context*)s, mb_y, &buf, s->gb.buffer_end - buf);
        emms_c();
//av_log(c, AV_LOG_DEBUG, "ret:%d resync:%d/%d mb:%d/%d ts:%d/%d ec:%d\n",
//ret, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, s->start_mb_y, s->end_mb_y, s->error_count);
        if(ret < 0){
            if(s->resync_mb_x>=0 && s->resync_mb_y>=0)
                ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x, s->mb_y, AC_ERROR|DC_ERROR|MV_ERROR);
        }else{
            ff_er_add_slice(s, s->resync_mb_x, s->resync_mb_y, s->mb_x-1, s->mb_y, AC_END|DC_END|MV_END);
        }

        if(s->mb_y == s->end_mb_y)
            return 0;

        start_code= -1;
        buf = ff_find_start_code(buf, s->gb.buffer_end, &start_code);
        mb_y= start_code - SLICE_MIN_START_CODE;
        if(mb_y < 0 || mb_y >= s->end_mb_y)
            return -1;
    }

    return 0; //not reached
}

/**
 * Handles slice ends.